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  • wobbler commented on How-ToDo's instructable Solar Mendocino Motor
    Solar Mendocino Motor

    I've got this from the photos and knowing how these work. The 7 magnets are used on the shaft as bearing magnets. The large magnet is used beneath the field coils and is what provides the turning force. The 26 magnets are used in the holes in the bases beneath the bearing magnets to provide the balance force against the shaft magnet. As i26 is not divisible by 4 and the shaft has 3 magnets on one end and 4 on the other, I suspect the author uses different numbers of magnets at each side, maybe 6 under the 3 side and 7 under the 4 side?A graphic type drawing of it blown apart would be useful.

    The short answer is no, not with a passive system. The longer answer is in the references and is called Earshaw's Theorem. The first one is a good overview of magnetic suspension and bearings, the second on specifically about Earshaw's Theorem. Basically, what it means is it can be balanced, but it is unstable so the slightest perturbation will cause it to become unbalanced (imagine balancing a needle on its point on a piece of glass). It can be done though by using controls and feedback which is how those desk toy globes that seem to hang in space work. The first reference also makes a few interesting comments about using superconducting materials so maybe we'll see some interesting developments in this once (if?) they get effective room temperature superconductors. The third reference s…

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    The short answer is no, not with a passive system. The longer answer is in the references and is called Earshaw's Theorem. The first one is a good overview of magnetic suspension and bearings, the second on specifically about Earshaw's Theorem. Basically, what it means is it can be balanced, but it is unstable so the slightest perturbation will cause it to become unbalanced (imagine balancing a needle on its point on a piece of glass). It can be done though by using controls and feedback which is how those desk toy globes that seem to hang in space work. The first reference also makes a few interesting comments about using superconducting materials so maybe we'll see some interesting developments in this once (if?) they get effective room temperature superconductors. The third reference shows superconductor levitation in action.ref:https://www.sciencedirect.com/topics/engineering/m...https://www.google.com/search?channel=fs&client=ub...https://www.youtube.com/watch?v=X5EoUD-BIss

    I suspect the difference is to keep the axle as level as possible but still provide a force toward the pivot point where the axle meets the end plate. It's difficult to tell from the photo, but it also appears that the coils are closer to one set of magnets than the other. As a consequence, one bearing is taking more of the weight than the other so to keep it level it needs more force and hence more magnets. There is a lot of nudging involved in balancing these things so they work as efficiently as possible- more fun all round!

    For clarification, you can't just replace the photocell with a battery within the coil without also adding something that controls the power through the coils to turn them on and off at appropriate times. This is why the commutator is used in a normal electric DC motor or Hall Effect switches in non-commutator type motors. This design doesn't need a commutator because the photocells themselves effectively are also acting as switches by only providing power to their own coils when facing the light. As a result, this motor assumes the light is coming from above generally. If it was lit from below the motor shouldn't turn as the photocell would be activating the coil when it faces the magnet and would stick there.

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  • wobbler commented on ashevillejm's instructable DIY Cloth Face Mask
    DIY Cloth Face Mask

    Thanks! Your looks much better than mine, though my latest non-fleece version doesn't look so bulky! As an aside, these will also make great cycling masks. I use cycling neck tubes in summer to keep out the flying bugs type rather than Covid and fleece ones in winter to keep out the cold, but they both have the problem of either steaming up my glasses, especially when I stop, or coming down and constantly needing to be adjusted. A design like yours but extended to the back would work great, look good and by fitting to the nose would solve both problems.

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  • wobbler commented on arpruss's instructable Improve Cheap KN95 Masks
    Improve Cheap KN95 Masks

    Hi, some interesting improvements here. Regarding the nose fit, I have used a heat gun and thermosetting plastic, commonly called plastic gutters! Feel free to check out my Instructable and feel free to add the method to your list, I'm not precious about it and if it helps anyone to make a better mask I'm happy!Keep safe and well!

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  • How to Kick Start a Motorcycle.

    Blimey, that was a long wait for a reply! I've grown up a lot since I left it. I come from old school British bikes when kickstarting a misfiring 500cc single would break your leg and throw you 50 feet into the air, not a word of a lie . Do you still need to tickle the carbs and put all the oil from the drips back in the oil tank in a modern bike?

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  • wobbler commented on ashevillejm's instructable DIY Cloth Face Mask
    DIY Cloth Face Mask

    Instead of wire, I've used thermosetting plastic. This is plastic that can be reheated and it will bend and then reset hard when cooled. The source I used for it was from plastic guttering. I cut a strip about 15cms x 1.5cm (6"x0.5"). I heated it until pliable using a heat gun (a hairdryer isn't hot enough) and then shaped it to match my face. Advantages over wire? Once set in shape, it stays in shape. Can be left in when washing. I also made a formed chin so it fits tighter around the chin. You can see my Instructable for more details.I have also redone it with no fleece materials. I put them in for comfort but I've since read that they make it worse, not better as the fleece material causes the droplets to split and become more aerosol.Ref:https://advances.sciencemag.org/conte…

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    Instead of wire, I've used thermosetting plastic. This is plastic that can be reheated and it will bend and then reset hard when cooled. The source I used for it was from plastic guttering. I cut a strip about 15cms x 1.5cm (6"x0.5"). I heated it until pliable using a heat gun (a hairdryer isn't hot enough) and then shaped it to match my face. Advantages over wire? Once set in shape, it stays in shape. Can be left in when washing. I also made a formed chin so it fits tighter around the chin. You can see my Instructable for more details.I have also redone it with no fleece materials. I put them in for comfort but I've since read that they make it worse, not better as the fleece material causes the droplets to split and become more aerosol.Ref:https://advances.sciencemag.org/content/early/2020...Carry on the good work!

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  • Super Dooper Scooper Funnel

    Thanks for your comment,but this is clearly one of the most dangerous builds I've ever done. In the wrong hands it could easily take your eye out so it's not really a laughing matter. If you make one, please treat it with caution and the respect it deserves at all times.

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  • wobbler's instructable Super Dooper Scooper Funnel 's weekly stats:
    • Super Dooper Scooper Funnel
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  • Voicetron - Voice Recording Toy

    Great Instructable, well explained and a good looking design! I can feel a robot coming on!

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    • The Bespoke Fully Fitted Covid-19 Face Mask
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  • Mesmerizing Ferrofluid-Display: Silently Controlled by Electromagnets

    Love your Fetch-A-Sketch! Absolutely brilliant and really well executed and explained. Are you sure that fluid isn't actually alive?

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  • Electrolytic Rust Removal Aka Magic

    As a follow up from my previous comment, I have now used this method a lot, so thanks for posting it!Because of how the process actually works you can do it on other metals. It works brilliantly (no pun intended- or was it?) on brass and it comes out like new. I have also used it to paint strip old diecast cars for renovation. It has a couple of advantages over paint stripper- it's cheaper and it doesn't harm plastic. After leaving a day or so then a wire brush usually sloughs the enamel paint off, although I have found some more modern ones it didn't. If you can't or don't want to strip down a model and take out the plastic windows, wheels etc. you can leave them on The +ve can still be an old tin can no matter what metal is in the -ve.What is actually happening is that the water is bre…

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    As a follow up from my previous comment, I have now used this method a lot, so thanks for posting it!Because of how the process actually works you can do it on other metals. It works brilliantly (no pun intended- or was it?) on brass and it comes out like new. I have also used it to paint strip old diecast cars for renovation. It has a couple of advantages over paint stripper- it's cheaper and it doesn't harm plastic. After leaving a day or so then a wire brush usually sloughs the enamel paint off, although I have found some more modern ones it didn't. If you can't or don't want to strip down a model and take out the plastic windows, wheels etc. you can leave them on The +ve can still be an old tin can no matter what metal is in the -ve.What is actually happening is that the water is breaking down in to oxygen on the +ve and hydrogen on the -ve. because the oxygen react with the can, it gets rusty. because the metal doesn't react significantly with the hydrogen, it just blows off the loose rust and oxide like atomic sand blasting.Regarding power, I just use a redundant 5v2a wall charger from an old mobile phone. It works fine one the types of things I've used it on up until now, such as diecast cars, brass vases, alloy carburettors etc. I also realised fairly early on that the wire going to the +ve can rots away quickly so I cut open a baked beak cam and put a bend in the corner of the sheet and hang that above the solution to be connect to with a crocodile clip. The other part I use cheap garden zinc plated wire and then trail it out of the solution to connect to the negative.I remember which way by -ve removes the rust, +ve adds the rust.Thanks again, I can't believe how much this has helped my upcycling and cleaning items!

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  • Mesmerizing Magnetic Wall Clock

    Fantastic design! I wanted to do a mystery clock a long time ago with the balls riding around on a horizontal mirror with the magnets attached to the hands of a clock mechanism beneath. However, on every mechanical clock I found the hour hand was underneath the minute hand so the idea wouldn't work. This is a really good design solution and also looks great!

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  • wobbler commented on RobertI24's instructable Camera Desk Lamp
    Camera Desk Lamp

    Great idea and a brilliant result! I was looking at creating an SLR lamp as I have some deceased SLRs and I'd already converted an old flash to a lamp so thought I'd mount it onto an SLR with a GU10 in the lens. However, seeing this has made me decide to turn at least one of them into a desk lamp first.I will probably put mine on Instructables as well, but I will credit the original genius that gave me the idea of using an old anglepoise!

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  • 1960s Style Leather Duffel Bag

    Hi 54shadow,I was only commenting on the possility. However, old leather saddle bags had a couple of leather straps on with buckles. The buckles went through two metal loops that seats had in the old days for just such a purpose. You just need a couple of thin leather belts and cut them short.However, if your saddle doesn't have the saddle bag loops, you can also buy add-ons that fit to the saddle bars as here:https://www.carradice.co.uk/products/saddle-fixing...Doesn't look like it would be too difficult to make your own though or you could fit a bar acroos under the seat and attach around that.

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  • wobbler commented on scooter76's instructable A Frame Cabin/Club House

    @MatthiasW19: Instructables is about people sharing their ideas, not about scoring points on some scale of literacy. Maybe this Instructable is full of mistake or not, you wouldn't know because you didn't read it. I personally found it to be comprehensive and correct in the construction. Then again I read it all from the viewpoint of a constructor, not an English teacher.However, there is nothing wrong with giving criticism, just back it up with a more constructive and pleasanter approach as to how to make an Instructable better, not by throwing your bottle out of the pram.@Scooter76: Good instructable!

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  • If you use a bulb with a filament or a halogen, the glass will be heat proof and shouldn't shatter. Filament bulbs heat up the glass very quickly, but what shatters glass is localised heating causing local expansion which then causes stresses leading to a break. However, the glass used in filament type bulbs is made from low expansion glass like Pyrex so it is heatproof and shatterproof.There is no chance of melting the glass with a candle.However, LED lights don't generate the same levels of heat that filament lamps do so I wouldn't trust those in case the manufacturer has just used normal glass.Alternatively, buy a small Pyrex glass chemistry flask designed to go over a Bunsen burner.I've also go a home made oil burner where I've used a glass tealight holder on a brass stand over the te…

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    If you use a bulb with a filament or a halogen, the glass will be heat proof and shouldn't shatter. Filament bulbs heat up the glass very quickly, but what shatters glass is localised heating causing local expansion which then causes stresses leading to a break. However, the glass used in filament type bulbs is made from low expansion glass like Pyrex so it is heatproof and shatterproof.There is no chance of melting the glass with a candle.However, LED lights don't generate the same levels of heat that filament lamps do so I wouldn't trust those in case the manufacturer has just used normal glass.Alternatively, buy a small Pyrex glass chemistry flask designed to go over a Bunsen burner.I've also go a home made oil burner where I've used a glass tealight holder on a brass stand over the tealight candle to act as an oil reservoir, which works well.

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  • Thanks for such an informative article. I'm looking to strip a very, very rusty laundry iron. Was debating whether to use white vinegar etc. but after seeing the actual results, this is definitely the way I'll be cleaning it. The addition of all the before and after photos was what makes this such a great, informative Instructable.

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  • This idea could make an interesting bracelet, although I suspect it may then not bend correctly around a wrist.

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  • Dear Sir,I commend you on your furthering of Galvanic energy control but controlling by touch? What wizardry is this? I can only assume you have been dabbling in mystic Eastern arts but would warn you about the dangers of the potentially unknown consequences. You only have to look at Dr. Strange to realise the dangers of the path you appear to be following.There is however great potential in your development and I look forward to furthering my own delopments by incorporating some of your esteemed ideas.As for your underwhelmed admirers, pity them, they do not understand your genius, athough it may become painfully clear if they accidentally open a portal to another dimension by touching Buddha in tbe wrong place.Your esteemed servant, etc.Wobbler

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  • This is interesting. I've tried making piezo stomp boxes with the piezo fed straignt into an amp but never got the sound I liked. This might work in giving a more "thumpy" sound. Will try it eventually (after the other hundred things on my "try it eventually" list!).

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  • I totally agree with what you are saying. I have two main lights driven off my electric bike battery, one which is very bright for off road, one which is a joy to ride with, one which points down to the ground and just gives enough to ride by. I use a motorcycle handlebar switch so I can easily flick between them and use the dim/dip one when passing either walkers or other cyclists. I also have a road light which is bright enough to be seen by but not blinding to other road users.Sadly, I think some riders have a "my light is brighter than yours" mentality.

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  • Sir, thank you for your comment, but I can assure you most sincerely that my tongue and cheek are not planted firmly together. I am no mere music hall act, but a serious natural philosopher, fully committed to furthering both science and mankind with the unlimited potentials of Galvanic Energy and luminiferous aether.However, from your quaint spelling of humor, I can only conclude you are a Colonist and, as such, still somewhat behind on the latest developments in these advances The future is bright, the future is luminiferous aether.Galvanism is the only way forward, the new energy of choice, Sir, steam has had its day and is for punks.I remain, your humble servant, etc., Wobbler

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    • The Galvani-Edison Luminiferous Aether Disturbance Generator
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  • Difficult to say if walking with a limp is too cliche or not without further information. What is the limp thing you were thinking of walking with?As to the assistant name, four letters seem to be de rigour, thinking of Igor or Hulk, but you need to go with something exotic/edgy/faintly scary. How about Mike?From my experiments with frogs and Galvanic energy, I would suggest it would help if you could practice twitching in front of the mirror. The frogs will of course be happy to at long last going back to their pond, should I find you to be a suitable test subject for my further experiments. I presume you aren't allergic to copper or too lanky? Lanky twitchy and flailing limbs can be dangerous, even when controlled by suitable restraints, plus it's all about size for assistants.

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  • Welcome back! I was hoping to use you as a test subject for my new Galvanic Reanimation Device, but it looks like it wasn't necessary. Still, give it time.

    Beer bottles? Sir, anyone with any breeding knows a gentleman always takes his beer from a jug. Leave the bottles to the servants! Also, I'm afraid your Maximum Field Theory is not the correct way to go for developing future Luminous Aether knowledge, but I wish you well in your future calculations.

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  • Thank you for your comment and advice, but I believe Messrs. Hoover and Dye's son have already made those developments based on the new field of Vacuum Energy.

    Dear Sir Hubert,I fail to see the relevance of Aleksei Lesov. Although I am by nature a Natural Philospher, I believe you are confusing Natural Philosphy with the other Philosophy, the one with a lot of thinking but not a lot of doing.As for Holonyak, he plainly was a charlatan. In attempting to ride on the shoulders of the great Tom Alva Edison, he literally stole Edison's Luminous Edison Device trademarked name and claimed it as his own. His device was also considerably smaller, virtually invisible. Who needs a smaller Luminous Edison Device? In the world of luminous aether device research and development, big is beautiful.I would also claim umbrage with your groundless assumption that I am a Colonist. I am Lancashire born and bred, although I have known a few Colonists and have almost …

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    Dear Sir Hubert,I fail to see the relevance of Aleksei Lesov. Although I am by nature a Natural Philospher, I believe you are confusing Natural Philosphy with the other Philosophy, the one with a lot of thinking but not a lot of doing.As for Holonyak, he plainly was a charlatan. In attempting to ride on the shoulders of the great Tom Alva Edison, he literally stole Edison's Luminous Edison Device trademarked name and claimed it as his own. His device was also considerably smaller, virtually invisible. Who needs a smaller Luminous Edison Device? In the world of luminous aether device research and development, big is beautiful.I would also claim umbrage with your groundless assumption that I am a Colonist. I am Lancashire born and bred, although I have known a few Colonists and have almost been able to converse with them, despite their curious accents. Nor am I unaware of the continent, having in the past travelled as far afield as Rhyll and Slaithewaite.Your humble servant, etc.

    Oh dear, it appears to have been more than 60secs, even more than a full minute. I do hope no harm has come to you. If so, this will be the fourth fatality this week as a result of my Luminiferous Aether Disturbance Generator. I'm beginning to suspect it may be more dangerous than I originally anticipated despite my care and attention to modern health and safety rules. If fatalities start to get into double figures, I may have to consider a re-design, although I will chalk it all up to experience and the justifiable risks of being at the cutting edge of Luminiferous Aether research in advancing science for the benefit of mankind as a whole.Please pass on my deepest condolences to your next of kin should your demise prove fatal.

    I am well aware of the moving pictures of Eadward Muybridge but fail how to see that taking a series of pictures of the device will help. I have tested the device by placing it down and looking at it for over an hour, without blinking, and I can honestly say it didn't move once.However, these are actually moving pictures based on Magic Lantern slides. Should you not have a Magic Lantern projector, can I suggest you reproduce the effect of motion by either moving your head from side to side whilst observing my Daguerrotypes or by keeping your head still and oscillating your preferred viewing device? I'm also sorry to hear that you have shenanigans, but I have heard that medical science is on the cusp of a breakthrough and in future they will be controlled, if not curable.

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  • Great Instructable and the final distressed look works really well with a very professional result. Even more important though was not using normal glass in this for safety reasons.

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  • Brilliant! These are definitley sellable!

    Or, in the words of Sir Cliff Richard, "Got myself a cryin', talkin', sleepin', walkin', Echo Dot!"

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  • wobbler commented on KJMagnetics's instructable DIY Induction Stove

    Some apparently aluminium (and copper) pans do work, but in reality they have a core of a suitable magnetic metal layer embedded in the base. Similarly, not all stainless steel pans work because not all types of stainless steel are magnetic. You can test if something will work on an induction hob by seeing if a magnet sticks to out.OnYou can also buy a flat heating disk which you place on top of the induction hob which turns it in to a hot plate for using with non-magnetic or glass cookware although it's obviously easier just to buy induction capable pans.

    I like the lateral thinking involved here and even more the mad genius in trying it out. It got me thinking that I might try putting magnets on a disk driven by the back wheel of my bike with a metal.plate under my seat. Ah, the luxury of a heated bike seat when cycling in the rain and snow!And then again, I might not, just in case it overheats going downhill. I wouldn't want to explain hiw I got a burnt bum in A&E.

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  • wobbler commented on Alex in NZ's instructable Pew

    I really like both the idea and your final piece. Regarding the two nicks on the front which you dislike, I would leave them there. They provide both a bit of character and a narrative to the history of the piece. Perfection sometimes means not being perfect. If you do fill them, consider using a contrasting wood or even a brass or copper infill.

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  • Great design!It would also make a great design for an Amazon Echo Dot holder whilst possibly also increasing the sound quality.The old version 2 Dot has a really odd way to throw out the sound, through a narrow slot somewhere on the bottom rim near the front. You can find the location easy enough just by running your thumb around until the sound stops. I've experimented with putting the Echo Dot on an upside down solid plastic plant pot with a 1cm hole in line with that point and the rim sealed to the plant post, which I then line with foam and placed a couple of 15mm holes in the sides for the sound to come out through. The result was a much better sound, less tinny and a bit more mellow.The new version 3 Dot though has a much better sound and the speaker seems to have a much bigger exit…

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    Great design!It would also make a great design for an Amazon Echo Dot holder whilst possibly also increasing the sound quality.The old version 2 Dot has a really odd way to throw out the sound, through a narrow slot somewhere on the bottom rim near the front. You can find the location easy enough just by running your thumb around until the sound stops. I've experimented with putting the Echo Dot on an upside down solid plastic plant pot with a 1cm hole in line with that point and the rim sealed to the plant post, which I then line with foam and placed a couple of 15mm holes in the sides for the sound to come out through. The result was a much better sound, less tinny and a bit more mellow.The new version 3 Dot though has a much better sound and the speaker seems to have a much bigger exit on the sides so that wouldn't work.

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  • Brilliant! Leeuwenhoek, eat your heart out!

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  • wobbler commented on theskashow's instructable Customizable Pack Frame

    The chest strap is a good call! It's another little thing that make a pack so much more stable and comfortable, stopping the pack pulling so much on the shoulders. It makes you wonder why it wasn't thought of sooner, it seems to be a relatively new innovation given how long rucsacs have been around. I even fit one to small packs if it's not got one.

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  • wobbler commented on theskashow's instructable Customizable Pack Frame

    I remember having the aluminium equivalent to this in the 70s with a curved ledge at the bottom. It was very lightweight and great for carrying loads. However, it had screwed joints and they were a bjt kf a pain, always working loose as the pack flexed. Hkwver, my next pack with an inner frame was so much better due to one thing mentioned here- the hip belt.I'm fairly certain, if it was possible to attach a hip belt effectively to these frames someone would have done so a long time ago as it made such a difference to carrying heavy loads.Maybe with carbon fibre you could make a hybid, an external frame but with an ergonomic shape and fit with a hip belt attachment system?

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  • wobbler commented on Lost Moai's instructable De-Bubbling a Compass

    The one thing this cheap compass has that the most expensive new compass won't have is the memory it will bring back to you of your grandfather every time you use it. That is worth much more than accuracy or a better build.Plus, it might have been cheap, but it's lasted long enough.

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  • wobbler commented on _Gyro's instructable Bike Wheel Lights Hack

    Great idea! I have an electric bike and don't want to mess aroumd with extra batteries, but this is a great way to keep the power on tbe forks, not the wheels.However, instead of painting I looked up glow in the dark spoke on Amazon and it came up with beads you attach to the spokes. I like the idea of putting tbese on spokes and shining uv leds on to them, so I'll put this on my "projects to do" list.Thanks for the idea!

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  • wobbler commented on wobbler's instructable It's About Time! Watch.

    Do they have it for raisins as well?

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  • wobbler commented on 271828-'s instructable LED 12V Camping Lights

    Thanks for your reply. I suspected as much. I've used Schottky diodes in the past for the same reason but your solution is more efficient.

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  • wobbler commented on 271828-'s instructable LED 12V Camping Lights

    Really well enfineered product. What is the purpose of the Mosfet? If it's to stop reverse connection, why not use a diode?

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  • Plus, ask anyone who lives full time in a caravan this size which they'd prefer! I guess you know the answer.Great job both in the construction and the Instructable.

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  • This is a really good example of how powerful and useful 3D printing is becoming.

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  • wobbler commented on fs woodworking's instructable Spider Shaped Lamp

    I like the idea of designing this so it looks like it's climbing down the lead hanging from a standard ceiling light socket. As I'm always wary of wood near incandescent bulbs and also because it's exposed, I'd use the LED equivalent of that type of bulb.

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  • wobbler commented on spyfoxy's instructable Trike Lights

    Interestingly, I'm just about to update my system. I've just bought a Shimano dynamo hub. I am planning on basing my system on 5v as the dynamo is 6v 3W. I will be using Schottky diodes in a bridge rectifier feeding into a 4xC type NiMh battery pack @3.6Ah total. Off this I will be taking the lights and a USB connector for charging phones or tablets and adding another optional mains adaptor charging socket.I've decided to go for this as sometimes I go out bike touring and keeping a phone charged is a problem. I was originally looking at carrying a solar charger but here in the UK it's not too reliable. Plus, the battery pack will be being charging even when I'm not actually using it so I will also always have lights and can then charge the phone off it even if I'm not riding. I am also th…

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    Interestingly, I'm just about to update my system. I've just bought a Shimano dynamo hub. I am planning on basing my system on 5v as the dynamo is 6v 3W. I will be using Schottky diodes in a bridge rectifier feeding into a 4xC type NiMh battery pack @3.6Ah total. Off this I will be taking the lights and a USB connector for charging phones or tablets and adding another optional mains adaptor charging socket.I've decided to go for this as sometimes I go out bike touring and keeping a phone charged is a problem. I was originally looking at carrying a solar charger but here in the UK it's not too reliable. Plus, the battery pack will be being charging even when I'm not actually using it so I will also always have lights and can then charge the phone off it even if I'm not riding. I am also thinking of using a single Schottky diode feeding into the lights or a couple of separate lights front and back so they will always be on whenever I cycle.

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  • I make these camping. They aren't the best of breads but they have the advantage that you just carry the raw material and add water and they can be cooked on a frying pan or even over an open fire. You can make them more tasty by adding sultanas, raisons or similar. Alternatively, make it in to beer bread by adding beer into the mix to give it a bit of lift. The other advantage of doing beer bread is it doesn't take a full bottle or can but once it's opened you don't want to waste it, do you?

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  • wobbler commented on Victor805's instructable The Joule Blinker

    Brilliant version of the Joule thief.

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  • I look forward to seeing what you do with the rest of the engine.

    Very clever reuse of a spark plug!

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  • Unless the rear wheel is a fixie, just like trying to cycle backwards on a normal bike, nothing will happen.

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  • Brilliant costume! It reminded me of seeing the Liverpool Giants Diver which commemorated the 100th anniversary of the Titanic sinking in 2012. It was done by a French street theatre company Royal de Luxe and was absolutely mind blowing. It was of course slightly larger than yours at 15m/50ft. You can see it coming out of the Albert Docks here and setting off across the city looking for his niece and her dog:C'est incroyable!

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  • wobbler commented on wobbler's instructable It's about time! watch.

    Thanks. I presume you mean the other slow watch when you say expensive! However, that in itself was a copy of the original mechanical clocks which only had an hour hand as the mechanisms weren't accurate enough to keep minutes and at that time minutes were less important to life than the hours. Eventually in the late 17th century the use of a pendulum allowed more accurate timekeeping and the minute hand was added. I'm just completing a time loop back to before 1690.You'll find more details in the referenced Wiki:https://en.wikipedia.org/wiki/Clock_face#Historica...As the saying goes, there's nothing new under the sun.

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  • I only found the video, I was not the maker of them. However, going back to the original YouTube video, they referenced here for details of the sphericon:http://www.thingiverse.com/thing:112367It also led to this, a singing oloid, which I found quite hypnotic:http://www.youtube.com/watch?v=2d2RchtzD-4

    I only found the video, I was not the maker of them. However, going back to the original YouTube video, they referenced here for details of the sphericon:http://www.thingiverse.com/thing:112367It also led to this, a singing oloid, which I found quite hypnotic:www.youtube.com/watch?v=2d2RchtzD-4

    I only found the video, I was not the maker of them. However, going back to the original YouTube video, they referenced here for details of the sphericon:http://www.thingiverse.com/thing:112367

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  • I like this, but at first I thought "You must be s***ing me!".

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  • Maybe that's all fir now.

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  • wobbler commented on wobbler's instructable Easy-type Secure Passwords

    It lets me keep a written record of the many passwords I seem to be accruing in a book. I use different passwords for all of the different sites I use for security. However, writing down passwords isn't exactly secure, so the unique missing secret word, which is personally easy to remember and I don't need to write down acts as a security feature for the written down passwords. If the extra word isn't present, the written passwords won't work. Hope that makes sense.

    just read this. My post is about being able to keep a list of different passwords in a secure way. Using the same pass phrase across many sites isn't secure. If I have to substitute numbers in the passphrase to keep it more secure, how do I record/remember all the different passwords? That's the problem I'm trying to deal with here.Finally, using an encrypted password database is ok on one machine, but I use different machines and I find this easy to do. I could even use somebody else's machine if I wanted (although I wouldn't trust it!).

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  • Beautiful design!

    Beautiful design! Would also be easily modified to make a very classy bike saddlebag. It got my vote!

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  • To see how a real capacitor works, why not repeat the experiment with an actual capacitor? So, what will happen if you do? Firstly, when you put the battery to the capacitor it will charge up to the battery voltage. Now, if you are using a digital voltmeter it will have a high input impedance and when the battery is removed, the voltage will not change or decay. To make it decay, put a resister across the capacitor (the bigger the resistor, the slower he voltage will drop). It will continue to drop but something else will happen. The voltage will be an exponential curve. That means it will always take the same time to go from any voltage to half the voltage. Time it and see e.g. if it takes 45sec to go from 8v to 4v, it will take 45secs to go from 4v to 2v or 45 seconds from 6.5v to 3.25v…

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    To see how a real capacitor works, why not repeat the experiment with an actual capacitor? So, what will happen if you do? Firstly, when you put the battery to the capacitor it will charge up to the battery voltage. Now, if you are using a digital voltmeter it will have a high input impedance and when the battery is removed, the voltage will not change or decay. To make it decay, put a resister across the capacitor (the bigger the resistor, the slower he voltage will drop). It will continue to drop but something else will happen. The voltage will be an exponential curve. That means it will always take the same time to go from any voltage to half the voltage. Time it and see e.g. if it takes 45sec to go from 8v to 4v, it will take 45secs to go from 4v to 2v or 45 seconds from 6.5v to 3.25v. The decay time is a function of the capacitor size and the resistor size. Look up why on the web by looking up "RC decay".Try it first using maybe a 100uF cap and a 1megohm resistor. Then make the cap bigger or smaller and see what happens (maybe double it) or make the R smaller or bigger and see what happens.ref:http://www.electronics-tutorials.ws/rc/rc_2.html

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  • I think you might be barking up the wrong tree.

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  • To see how a real capacitor works, why not repeat the experienced Kent with an actual capacitor? So, what will happen if you do? Firstly, when you put the battery to the capacitor it will charge up to the battery voltage. Now, if you are using a digital voltmeter it will have a high input impedance and when the battery is removed, the voltage will is fly change or decay. To make it decay, put a resister across it (the bigger the resistor, the slower he voltage will drop). It will continue to drop but something else will happen. The voltage will be an exponential curve. That means it will always take the same time to go from any voyage to half the voltage. Time it and see! E.g. if it takes 45sec to go from 8v to 4v, it will take 45secs to go from 4v to 2v or 6.5v to 3.25v. The decay time i…

    see more »

    To see how a real capacitor works, why not repeat the experienced Kent with an actual capacitor? So, what will happen if you do? Firstly, when you put the battery to the capacitor it will charge up to the battery voltage. Now, if you are using a digital voltmeter it will have a high input impedance and when the battery is removed, the voltage will is fly change or decay. To make it decay, put a resister across it (the bigger the resistor, the slower he voltage will drop). It will continue to drop but something else will happen. The voltage will be an exponential curve. That means it will always take the same time to go from any voyage to half the voltage. Time it and see! E.g. if it takes 45sec to go from 8v to 4v, it will take 45secs to go from 4v to 2v or 6.5v to 3.25v. The decay time is a function of the capacitor size and the resistor size. Look up why on the web!

    oops done the above reply on a tablet!lots of errors! Will edit later on laptop so ignore above until I've sorted it! Damned auto correct! Apologies!

    Unfortunately your physics teacher doesn't know what he is talking about. I have explained fully in my previous references, I'd suggest you talk to either a local radio ham or trained electronics person who actually understands the difference between a battery/cell and a capacitor/condenser. Also, do a Google search for how capacitors work, there are lots of sites which will give you a good overview.

    I don't know why you keep insisting this is a capacitor. What you have made is actually one of the first electric cells, a Galvanic or Voltaic Cell, named after their inventors. See the reference for further details and for a fuller explanation of how they work. If this was a capacitor it would work with both electrodes having the same material, which this design will not do.You also seem to not understand about how a capacitor would actually discharge if you were measuring it using a voltmeter. A charged capacitor will discharge through a load with an exponential decay. It will continue to decay. It will not drop down and then stop at a certain value, it will continue to decay to lower and lower voltages.ref:https://en.wikipedia.org/wiki/Galvanic_cell

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  • Definitely a battery!

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  • Sorry, decided it wooden't work. Think I'vy been barking up the wrong tree.

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