author
35Instructables1,565,421Views11,043CommentsUK LincolnshireJoined August 30th, 2006
Retired technology teacher - 2 kids, I have an Hons deg in Design and Technology - 28 years as Computer systems engineer Trained as Electronics engineer in the Royal Air Force

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  • rickharris commented on rickharris's forum topic Electric vehicle motor selection18 hours ago

    Many thanks for replying, Golf cart motors will work well for your application where torque is more important than speed.Thanks for the link.

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  • rickharris commented on rickharris's forum topic WHY WHY WHY can't I post18 hours ago

    Thanks - again if I click the link in the email it takes me to the front page. not to your reply.

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  • rickharris commented on rickharris's instructable Technical Sketching and Drawing.18 hours ago
    Technical Sketching and Drawing.

    Hi,There are a lot of youtube videos on technical drawinghttps://www.youtube.com/results?search_query=techniCAL+DRAWINGOf course much these days is done in CAD. And that depends on the package your using.NOTHING replaces practice. Understanding perspective and isometric drawings until you can do them freehand is a good skill to learn.If You have specific questions please ask, otherwise spend a lot of time drawing things around you. I maintain ideas sketch books I have perhaps 20 or 30 over the years where I work out ideas, sketch plans and inspiration. It's a habit worth culturing.

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  • rickharris commented on rickharris's forum topic WHY WHY WHY can't I post1 day ago

    Thanks for that DU you simply confirm my thoughts.In the original post I put a lot more details but lost the will to live after the 3rd try.my original motor was indeed a brushed motor although 24 volt running at a max of 17 amps. At this level it got fairly hot and we cooled with a fan. The 250 watt rating was continuous use. 3000RPM geared 14:1 to the wheels. to give a theoretical max speed of 35 MPH.As brushless motors are fairly cheap my second thought was you could run 2 or 3 or 4 in parallel to increase the available power. Even a one or two Hp would be fairly significant in a very light single person car on the flat.

    The original post exists here https://www.instructables.com/topics/BUDSASSJUMXP9H7/It just isn't seen by the search engine. I wonder how much else gets "lost"

    Thanks

    IF this worked, Then the system has been very unreliable and erratic over the past week or so..Now my REAL question that I asked a week ago.My electric racing car had a 250 watt DC motor that weighed around 4 or 5 Kg.Now this motor claims to be 4 K watts. https://hobbyking.com/en_us/turnigy-c580l-580kv-brushless-inrunner-motor-4000w.htmlOther than electric bikes I seen lightweight cars or velomobiles using such a motor why not. Am I missing something. The RPM will be very high but a suitable gear box isn't beyond engineering.So why are they not in common use? $000 watts is 4000 watts in my book. (about 5.5 HP)Expert opinion?

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  • rickharris commented on iceng's forum topic Your full of Bugs !1 day ago

    I can't see my draft instructables or anything else clicking the link takes me to the main page again.

    IF this worked, Then the system has been very unreliable and erratic over the past week or so. I am unable to post a topic or question so Ill hijack this as it's really a bug anywayNow my REAL question that I asked a week ago.My electric racing car had a 250 watt DC motor that weighed around 4 or 5 Kg.Now this motor claims to be 4 K watts. https://hobbyking.com/en_us/turnigy-c580l-580kv-brushless-inrunner-motor-4000w.htmlOther than electric bikes I seen lightweight cars or velomobiles using such a motor why not. Am I missing something. The RPM will be very high but a suitable gear box isn't beyond engineering.So why are they not in common use? $000 watts is 4000 watts in my book. (about 5.5 HP)Expert opinion?

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  • They look like CO2 cartridges as used in Soda Syphons - a Local restaurant may be able to help you. Alternatively do you have a Shooting club that starts users on Bb guns.https://www.alibaba.com/showroom/empty-co2-cartridge.htmlAllibaba listing for empties.

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  • nswered elswhere - posted twice

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  • They look like CO2 cartridges as used in Soda Syphons - a Local restaurant may be able to help you. Alternatively do you have a Shooting club that starts users on Bb guns.https://www.alibaba.com/showroom/empty-co2-cartridge.htmlAllibaba listing for empties.

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  • rickharris commented on iceng's forum topic Your full of Bugs !7 days ago

    :-) A lot has changed Iceng, some even for the better! Any specific bug that is bugging you?

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  • rickharris commented on WeTeachThemSTEM's forum topic ​Teachers! Let's Connect!7 days ago

    Hi, As a, now retired, Design teacher a number of my school projects, The electric racing car, the geodetic greenhouse The microprocessor starter and how to do you technology course work are all written up here.

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  • The continuous output current of the L293D is ONLY 600 Ma.If you apply a larger load than that it will get hot and the thermal cut out will shut it down.The enable and control signals should be 5 volts..The supply (for the load) can be up to 36 voltshttp://www.ti.com/lit/ds/symlink/l293.pdfData sheet.

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  • rickharris commented on Tooltip's forum topic Advice on Brass wire soldering10 days ago

    Anything that can get it red hot. propane is fine for small items, Oxy acetylene for bigger things. Gas and forced air is also a good option if you don't have access to oxy acetylene.

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  • rickharris commented on SammyPati's forum topic Question Re: Membership status15 days ago

    Interesting your profile used to show you but now seems not to.instructables should tell you when your current membership is running our and give you a chance to activate another.

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  • rickharris commented on AndreeaS19's forum topic Airsoft target floating15 days ago

    translation:"I have tried to make this instructable but unfortunately it isn't working.I made it just as your instructions but it still didn't work.has anybody made this and got it working?i tried with a compressor but don't know if the air flow was too small."Who says all those years in the classroom were wasted! :-)

    1. You need a good fast air flow.2. Your air outlets need to be vertical3. your targets need to be very light and a ball or cone to stay in the air stream.4. try balancing one of your balls on a hair dryer air stream to get the idea.

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  • rickharris commented on Tooltip's forum topic Advice on Brass wire soldering15 days ago

    Technically your trying to braze.The flux is to clean the metal and prevent oxidationi generally use Borax as a flux, it's good and cheap for brazing and silver soldering.This is how I would do it.1. Clean both wires2. Make sure they are in close contact and heat then dip in flux.3. Heat brazing rod and dip in flux to coat.4. Heat joint to red hot applying the brazing rod - when temp is right it will soften and flow into the joint.5. allow to cool. brush off excess flux.

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  • Steve's offer is probably the best you will get.

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  • rickharris commented on Downunder35m's forum topic Funny login bug!22 days ago

    :-) your making the assumption that I would care!No I cleared my browser Cache to enable logging in again. No mystery.

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  • rickharris commented on Downunder35m's forum topic Funny login bug!23 days ago

    Many thanks, I haven't been able to log in for a week or so until today. Appreciated :-)

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  • rickharris commented on hobbit590's forum topic In over my head - pH automation2 months ago

    Ok I take your point.Lets see if my experience is any use to you.1. Your going to need to start by writing a really detailed User Requirement Specification (URS) for what your client wants - detailed down to the last $ of costing, the sizes, the expected outcomes - this is YOUR bible - if you can respond totally to that specification your client will be most happy and the project will be a success.2. your going to take that User Requirement specification and write your response A functional Specification (FS). this will detail HOW to do the job, what is required for each element, costings and any other information needed to do the job - eg. your going to need to locate and get the specification for a suitable sensor to do what the URS wants. That will probably (but not limited to) be i...

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    Ok I take your point.Lets see if my experience is any use to you.1. Your going to need to start by writing a really detailed User Requirement Specification (URS) for what your client wants - detailed down to the last $ of costing, the sizes, the expected outcomes - this is YOUR bible - if you can respond totally to that specification your client will be most happy and the project will be a success.2. your going to take that User Requirement specification and write your response A functional Specification (FS). this will detail HOW to do the job, what is required for each element, costings and any other information needed to do the job - eg. your going to need to locate and get the specification for a suitable sensor to do what the URS wants. That will probably (but not limited to) be interfaced with a microprocessor. You need to identify the relevant inputs and outputs your going to need so you know how big (or small ) the microprocessor needs to be. 2. You need to detail to the point of identifying ranges of accuracy etc, Materials, the fluids your dealing with and any other restrictions you can possibly think of that apply to the project. (this isn't easy - I used to do this as a consultant for big money but the more thorough you do this the easier the project will be.)Note:The sensors your going to buy and MUCH of what you do after that depends a lot on what they need.to be continued...

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  • rickharris commented on hobbit590's forum topic In over my head - pH automation2 months ago

    https://www.google.com/search?q=Automatic+PH+contr...Do the research

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  • More details needed: chill down to what?do you need physical presence?Partner to do what? electrical, mechanical, Software?

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  • rickharris commented on zikkij's forum topic Code for website2 months ago

    That web site is created as a blog so anything you fancy really. i use Blogger from Google - works for me.http://nz-2015rah.blogspot.com/

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  • You don't say WHY you need to do this - but your highest energy density is going to be a lead acid car type battery (that's why they use them in cars)Couple that with a suitable sized inverter and you have a semi portable power source.HOWEVER I would approach this in a different way and build a PC suitable for battery use. having used the raspberry Pi I found it to be fairly easy with LOTS of support.https://www.instructables.com/howto/PI+PC/

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  • rickharris commented on AdvanŽ's forum topic Stairs redesign2 months ago

    Use safety glass or Plastic. Safer but lets light through.Or use a net mesh of some kind.

    1. Stair gate at top and bottom Preventing accidents is easier than dealing with them2. Box in the open side but use safety glass so you keep the open view.3. Fill in the gap between stairs.4 they are really steep I think in the UK they wouldn't meet building code - i guess nothing to be done about that.

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  • Not that I know about. But your PC probably has an HDMI input on it.

    For me I would play the HDMI signal through my PC, Use Audacity (free) to record it. Then play the second one and record it. Use audacity to mix both sound captures and output as you want.

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  • rickharris commented on potofgold's forum topic 4 wheeled Quad-Cycle!3 months ago

    https://www.instructables.com/howto/velomobile/

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  • It beats me. many of the most frequent contributors to his "forum" have extensive software development experience, it's free why not use it.

    I could vote for that

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  • The Questions page is STILL prey to listing posts that are years old. This can't be a serious problem. just make the page more obvious.

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  • 1. Does it work2 No - there is something missing3 Yes - fine carry on.The definition of QUALITY in a product is that it does what the end user wants.There may be many more components in a commercial product for various reasons, legal or practical - However something that works to your satisfaction is a success on any level.

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  • rickharris commented on Simon-does's forum topic Vending machine3 months ago

    You just might get more interest if you put more details in. like where are you in our wide world, What are your skills, What skills are you looking for, WHY should anyone help out. Why is this project going to be very exciting (or as is possible is it just that you need a vending machine and thought you might get some free help?

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  • rickharris commented on elami123's forum topic Make a CNC with Camera3 months ago

    IF you have the hardware and software skills to complete the project I can see 3 ways to go about this.1. Use a fairly standard line follower type circuit (lots of examples on the web)2. Raster scan the image looking for black using a camera with a very small field of view - in fact you could do this with a simple light sensor. When you read a black point pulse the laser to cut.3. As DU says capture the image and vectorise it reduce the contrast until only the black lines show. Then convert into Gcode for cutting.For me I wouldn't do any of this at all - I would build the CNC system and slave it mechanically or electrically to a pointer, run the pointer over the parts of the image you want to cut - Job done. Something like the way a copy router works.

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  • it's a Prusa I3 my son owns it.

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  • Building a flight simulator, making some silver jewellery for friends in New Zealand, Improving 3D CAD skills now I have access to a 3 D printer.

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  • rickharris commented on LoloN1's forum topic Robotics Aspirant 4 months ago

    https://www.instructables.com/class/Robots-Class/https://www.instructables.com/id/Lets-Program-a-PI...https://www.instructables.com/id/Reading-Sensors-With-a-Microprocessor/https://www.instructables.com/howto/arduino+robot/I don't know your starting skill level but Robots suggests microprocessors. When you crack using them the hardware is fairly straightforward.http://solarbotics.net/it isn't totally necessary to use a microprocessor, So called BEAM robots use standard electronic components to achieve amazing results. https://www.lego.com/en-gb/mindstormsis always an optionhttps://mindsetsonline.co.uk/product-category/robo...has ideas and lots of materials if you in the UK.

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  • How to Ask a Question in Instructables.

    Ken:1. This instructable is to show you HOW to ask questions (in the community area oft the forum)2. However Unless you have a very serious reason to run the bulbs in series don't, they will be half brightness and if 1 blows they both go out.Run the 2nd bulb in parallel the first. see diagramDisclaimer: I can't see what you have done and so am talking principles here not practicalI am not a certified electricianI don't know where you are so you need to make sure your work is to local code.Anything you do you do at your own risk.Click on diagram to open

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  • rickharris commented on seamster's forum topic What's on your tool wish-list?4 months ago

    I thought a bit more - My CAD skills are fairly high, 2 D and 3D using Sketchup so a CNC router, A 3D printer, + the consumables necessary to run them.

    You can get microprocessor based oscilloscopes very cheaply now, they connect to your PC for a display.https://www.rapidonline.com/voltcraft-dso-2020-usb...https://www.picaxestore.com/index.php/en_gb/catalo...even cheaper. £14 !!

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  • rickharris commented on seamster's forum topic What's on your tool wish-list?4 months ago

    Laser cutter

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  • rickharris commented on randofo's forum topic Old How-To Books4 months ago

    https://books.google.co.uk/books?id=vOhIAAAAMAAJ&p...Popular mechanics from 1950 Adverts are interesting.

    Google books is an excellent source for old bookshttps://books.google.co.uk/books?id=vOhIAAAAMAAJ&p...is a book of 500 mechanical mechanisms, many forgotten about today.

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  • rickharris commented on Downunder35m's forum topic VR gaming parties anyone?4 months ago

    A win on the lottery here allowed me to buy an Oculus system for my Birthday this year. My intended use is as a headset for a flight simulator (in progress). 1. I was astonished by how immersive it is.2. I was disappointed to find i could see the pixels in the head set.3. If your prone to motion sickness (i am) then this perhaps either isn't the technology for you or your going to take a long time to get acclimatised 4. You really really need a fairly large dedicated place for it. Setting up, putting away is a pain.

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  • Even more confusion. The search algorithm is even picking those posts with the latest update. I reposted in my original comment about old and new posts getting mixed up and lo and behold it stays at the bottom of the list, isn't that curious.

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  • rickharris commented on wdemarche's forum topic DIY Scuba Tank (breath underwater)5 months ago

    To breath underwater you need a DEMAND regulator. Not just something to lower the presure.

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  • For me although the making and problem solving is enjoyable I still only make things that others want or I want. That way I need to get to the end.breaking a project down into small sections with defined outcomes also helps a lot. that way you can see and touch each milestone as they are finished.A project isn't a monolith - one big chunck of work it's a lot of minor triaumphs that when fitted together make something wonderful.

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  • FLIR Thermal imaginghttps://www.amazon.co.uk/prettygood7-Infrared-Prof...

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  • https://electronics.stackexchange.com/questions/23...Found by google search - click on image for full size.

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  • Your soldering leaves much to be desired. You need to check that you don't have any bridges across the tracks. Double, triple check your circuit is assembled correctly.

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  • If you don't have much building experience this is going to be complicated.HOWEVER: Your best bet in my opinion is to source an electric scooter strip it down and fit the parts to the bike.Ebay may be your best source if you want to buy separate bits.For the most part you don't need complex speed controllers a simple on off button will surfice if you get the motor and gearing correct.

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  • To some degree I appreciate what you say.However as I recall the real reason questions dies off is that the site made it harder to find the question option. Since then it has been made harder and harder. So fewer questions.I thought the main thrust of the site after show and tell was to educate and promote the maker ethos.Most of the "old hands" at answering questions have left, frustrated by the difficulty in finding and answering. Shame.It might just be that a section for offering technical help with your projects should be prominent and perhaps headed "HELP WITH YOUR PROJECT" Not relatively hidden and headed "TOPIC"Mmmm - As someone who understands the value of being able to ask questions of a wiser and more experienced head I would hope this will be r...

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    To some degree I appreciate what you say.However as I recall the real reason questions dies off is that the site made it harder to find the question option. Since then it has been made harder and harder. So fewer questions.I thought the main thrust of the site after show and tell was to educate and promote the maker ethos.Most of the "old hands" at answering questions have left, frustrated by the difficulty in finding and answering. Shame.It might just be that a section for offering technical help with your projects should be prominent and perhaps headed "HELP WITH YOUR PROJECT" Not relatively hidden and headed "TOPIC"Mmmm - As someone who understands the value of being able to ask questions of a wiser and more experienced head I would hope this will be resolved in the near future.

    Just as a by the by the sort isn't even working as sorting recent replieshttps://www.instructables.com/topics/Vertical-Axis...for example hasn't had a reply in the past 4 months and yet is only 2 posts below this one I wrot a few days ago. Something wrong there.

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  • Will this be changed as suggested to put newest topics at the top?You end up either having to read every publishing date or answering questions that will never be read again by the original author.My understanding of this section was that it was there to share the expertise of the collective "brains" of instructables, may i say some very highly qualified and experienced brains at that, to help makers with their projects.An answer 10 years down the road isn't helping anyone.

    Possibly a setting, I'll try the mobile app, Oh no they abandoned that as well!!A voice crying in the wilderness, but I try.

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  • Drying anything requires that the water molecules are excited to make them 'jump' away from the material, a breeze then blows those molecules away.We often add heat because this energises the water molecules to' jump' higher and makes them easier to blow away.Something like the image attached (click for bigger view) would work.BUT for cheapness omit the dehumidifier and just vent the moist air outside replacing it with air flow from the house.A modest heat is all that is required, IF you put wet clothes over a heat source then you MUST put a shield between the clothes and that heat source + sensible protection against overheating. NEVER leave such an apparatus unattended.

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  • Glad to be a help."Check out linear actuators" as I said - 90 % of the problem is knowing where to look. Good luck with the development

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  • rickharris commented on Worby10's forum topic Circuit design5 months ago

    You don't say when you want the light to go off - If you want it to go off when you flip the switch again then all you are doing is reversing the switch operation.There has to be more to the specification than this. Tell us.

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  • I assume you want a saddle pillar mounted ar, I don't think it matters much as long as the trailer arm is free to pivot so the trailer can follow as it wants, the trailor wheels must be parallel and parellel to the center line.

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  • Whilst we are discussing this you will find it hard to get the platform to stop abruptly at the ends of travel. Unless you allow a distance to getup to speed and slow down you may not get the 1 inch of constant speed you need.The commercial way to do this is to implement a PID loop (look it up - You tube has some videos.) so that as the platform nears the end it starts to ramp down the speed coming to a stop exactly on the mark every time.this may or may not be an issue for you but I suf=ggest you will need as a minimum an end limit switch and probably some kind of soft buffer if you don't use a PID loop.

    On a sewing machine that does exactly this there is no mechanical guide the tread just naturally sits side by side, all you need is a gap between the thread exit and the spoolhttps://www.google.co.uk/search?q=rethreadding+a+b...

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  • I missed out a picture of this done directly with a belt.You would need to find or make a motor run at a suitable speed

    OK a length of 6 mm all thread rod has a 1 mm pitch, that is for each turn of the rod the nut travels 1 mm, so 25mm in an inch.You need to get 25 Rev per sec = 1500 RPMA lot of small DC motors will do 3000 RPM or more, the load will be very light.This should work for you.Yes the toothed belt is as you say - see image.Amazon have a choice because of people making 3D printers.Of course you can size your pully to give you higher or lower RPM at the rod.You can click on the images to see it bigger.Check out Linear actuators. both DIY and commercial.To drive the motor both ways you will need an H bridge. If your using an Arduinohttps://www.instructables.com/id/DC-Motors-Part-1-...https://www.instructables.com/id/H-Bridge-for-Dumm...Or a DPDT switch if you want to try it manually initiallyHa...

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    OK a length of 6 mm all thread rod has a 1 mm pitch, that is for each turn of the rod the nut travels 1 mm, so 25mm in an inch.You need to get 25 Rev per sec = 1500 RPMA lot of small DC motors will do 3000 RPM or more, the load will be very light.This should work for you.Yes the toothed belt is as you say - see image.Amazon have a choice because of people making 3D printers.Of course you can size your pully to give you higher or lower RPM at the rod.You can click on the images to see it bigger.Check out Linear actuators. both DIY and commercial.To drive the motor both ways you will need an H bridge. If your using an Arduinohttps://www.instructables.com/id/DC-Motors-Part-1-...https://www.instructables.com/id/H-Bridge-for-Dumm...Or a DPDT switch if you want to try it manually initiallyHave fun

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  • It depends on how fast you need the platform to move. If relatively slowly then a DC motor driving a length of threaded rod with a nut on it attached to the platform will do the trick and is easy to speed control with PWM( Pulse width modulation).Faster movement then i would go to a Toothed belt and a stepper motor, this is going to need some research on your part to understand how to drive it , but there is a LOT of information on the web.You might get away with a dc motor and step down gear box, say from a cordless electric drill or screw driver. This can drive a toothed belt.

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  • Taking into consideration my comments above I am not inclined to help you build such a device - Sorry. It isn't something your going to use for the benefit of anyone other than yourself and maybe to the detriment of others.I repeatThe energy required would be considerable, IF you don't know how your not likely to be safe with such potentials.

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  • 1. EMP = DEAD not disabled. Thats DEAD forever. You may not want this2. Your neighbours would hunt you down assuming this were possible.3. The energy required would be considerable, IF you don't know how your not likely to be safe with such potentials.

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  • rickharris commented on BoomGuy's forum topic Rotary Tool neck thread size5 months ago

    The generic dremel I have is of German origin and has an M8 fine thread

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  • How to Ask a Question in Instructables.

    1 start at the opening page. (This is the page you start at ie the log in page (see my image)2. Click Community3. Click New Topic4. Enter your question5. Hope for a helpful answer.There isn't any reason not to use a 24 to 12 volt converter, make sure it can handle the current. However I assume your using lead Acid batteries (car type batteries) - I doubt personally you will deplete the charge on 1 to the stage they wont charge properly.In principle it is possible to get an unbalanced system, SLA's are very robust. HOWEVER if your battery bank is Lipo based then things are different.

    1. Welcome to Instructables the biggest show and tell site there is.2. I am pleased you read through my intro to how to ask a question.3. So that more experts will see your question I suggest though that you go to The Intro page (the first one you see when you enter Instructables, Select COMMUNITY, Select New Topic and cut and paste your question in there - You will get more views and potentially more answers that way. Only i as the author get notifications from this instructable.4. Obviously I am not at your house so Only have a vague understanding of what you trying to do - thanks though for the explanation, - if your using 2 x 12 volt battery you can tap off 12 volts from one battery and the 24 volts from both batteries See diagram

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  • rickharris commented on redlethe's forum topic How to heat a tent- safely?6 months ago

    DON'T burn charcoal or any solid fuel inside a tent without a working flue.People have dies from Carbon monoxide by putting a disposable BBQ in the tent because it was raining.Gas isn't much better unless you make a gas fires secondary air heater. ie the gas heats air which heats your tent.Our Marquees are electrically heated if necessary,When Camping I wear more clothes and have a 4 season sleeping bag, if your cold get in it.

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  • rickharris commented on minus273degrees's forum topic making methanol6 months ago

    https://www.youtube.com/results?search_query=Makin...

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  • For many years my father used a cut throat razor. (I never had the courage), He sharpened it every time on a leather strop before use. Never saw him put any abrasive on the strop though.He was a steam engineer all his life and a tool that wasn't sharp was the devil incarnate to him. I think my Mother has kittens every time I went into the shed to help him do something.However he taught me respect for sharp and heavy things, how to sharpen them and how to use them. Result, I became an electronics engineer!!

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  • I have seen on good old You tube people using an MDF wheel as well, a bit more sturdy I suppose but for light work the cardbaord works fine.

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  • Best advice for sharpening any tool is do little but do it often. I polish my knife on a cardboard wheel on my grinder, a little jewellers rouge give an excellent edge.

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  • rickharris commented on nedwired's forum topic Archives6 months ago

    The instructables search feature works quite well. it uses google to search the site.

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  • A scissor jack Effectively a linear screw actuator can lift much ore than 2 tonnes with a humans feeble input. The linear thrust from your screw will be very high.

    https://12vactuators.com/how-to-calculate-linear-a...https://cdn2.hubspot.net/hubfs/4316198/Downloads/t...

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  • In the UK bar keepers Friend is very similiar by the sound of it, To feel it is just like old fashioned Jif powder cleanser now sadly degraded into a cream cleaner, no where near as good.For polishing small jewellery I made a barrel tumble polisher from an old Film developing can and a few lego wheels. Works great with mild abrasives to polish to a high standard and gets into all the nooks etc. i often use cork as a polish carrier.Images from Amazon and Cooksongold.

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