author
35Instructables1,572,602Views11,053CommentsUK 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 followed 3D Printing channel 9 days ago
  • rickharris commented on LyndaA11's forum topic Green bamboo13 days ago

    Should be OK, It will dry out in time BUT it may not stay straight.

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  • rickharris commented on seanbell157's forum topic How would you make this costume?13 days ago

    https://www.youtube.com/results?search_query=COS+play+costumestry watching some of these videos on costume making.

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  • Wood can be stained if stain is waterproof.If you want the stubs to be permanently mounted I might consider PVA glue However they won't come off again and it will effect the look of the paper. (make it slightly glossy)If you want to preserve the stubs then your going to have to find some system that will not harm them - Look at how stamps are mounted in an album.

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  • rickharris commented on izzys13's forum topic Help plz:)13 days ago

    1. Start searching the internet there are lots of sites with craft ideas on them to get you started.2. If your intending to sell, you need to know what your work materials cost, how much time you spent on it and how much you want for that time. A good way is to look at what others are charging for similiar items.3. ETSY is one craft site for selling, Ebay of course but look around you locally, there might be shops that will display your work on a sale or return basis for a percentage of the price.4 Flea markets (car boot sales in UK) - good place to take a stall5. Local Market place, generally stalls don't cost much.You don't say where in the world you are but postage costs might be an important consideration.In this day and age I generally suggest to people they need to do the jobs oth...

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    1. Start searching the internet there are lots of sites with craft ideas on them to get you started.2. If your intending to sell, you need to know what your work materials cost, how much time you spent on it and how much you want for that time. A good way is to look at what others are charging for similiar items.3. ETSY is one craft site for selling, Ebay of course but look around you locally, there might be shops that will display your work on a sale or return basis for a percentage of the price.4 Flea markets (car boot sales in UK) - good place to take a stall5. Local Market place, generally stalls don't cost much.You don't say where in the world you are but postage costs might be an important consideration.In this day and age I generally suggest to people they need to do the jobs others don't want to do or don't have time to do:Gardening, takes little real skill and can be a regular income in the summer months. Walking dogs, at least in the UK, this can be a big business, people have pets but are working and need someone to look after them whilst on holiday or whilst they are at work.

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  • rickharris commented on Downunder35m's forum topic The future of "mobile" energy...21 days ago

    I used to have a job where we were standing around for long periods waiting for aircraft to arrive.We started discussing the future - I was around 20/21 at the time so about 1969/1970.We agreed that more or less everyone would be retiring at 50 because so many jobs would be done by Robots and the work field would need to be cleared so younger people had jobs of some kind.Leisure would be a BIG industry so people would be occupied.Plastic cards would be used to pay for transport and food. Most food would be produced underground with artificial lights in automated systems, seeds in one end and plants out of the other, Animals also would be kept indoors most of their lives.Homes would be connected by an underground conveyor system to the shops you would dial up your shopping list and it wo...

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    I used to have a job where we were standing around for long periods waiting for aircraft to arrive.We started discussing the future - I was around 20/21 at the time so about 1969/1970.We agreed that more or less everyone would be retiring at 50 because so many jobs would be done by Robots and the work field would need to be cleared so younger people had jobs of some kind.Leisure would be a BIG industry so people would be occupied.Plastic cards would be used to pay for transport and food. Most food would be produced underground with artificial lights in automated systems, seeds in one end and plants out of the other, Animals also would be kept indoors most of their lives.Homes would be connected by an underground conveyor system to the shops you would dial up your shopping list and it would appear in your home automatically.Transport would be totally automated with dedicated roads for trucks and cars.Education would be mainly at home via a (TV I thought then as computers didn't exist as we know them today)The parents would be held responsible for their child's learning, with severe punishments for letting their attendance fall off. Most punishment could be by limiting access to entertainment systems - easy if the government controls your access card.The education system will monitor progress, if you fail a progress test your automatically directed back to the relevant section for review. if you continue to fail then a human tutor will be notified and step in to help you over the problem. No progress unless you can demonstrate you understand and can apply the knowledge you have learned.Socialisation is taken care of by compulsory attendance at various activities not part of the learned curriculum. ie. clubs these are monitored by humans of course but periodically you undertake psychometric tests to make sure your adjusted. Maladjusted people, when identified, are given appropriate psychological support. The idea is to avoid criminals and malcontents by education early in their development.Lots of other things, some of which are now true such as CAD CAM and 3D printers.

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  • rickharris commented on iceng's forum topic Your full of Bugs !22 days ago

    :-) I find it hard to see you pondering over a lot of cardboard bits. However thanks for the reply.Expert definition: - X is an unknown quantity and a spurt is a drip under pressure!

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  • rickharris commented on sher dil's forum topic Train Direction22 days ago

    These sort of things are very common on the internethttps://www.google.com/search?q=model+train+controller+circuits&tbm=isch&source=univ&sa=X&ved=2ahUKEwjp_d2sn_zhAhX4QxUIHQTrCM8QsAR6BAgIEAE&biw=1920&bih=937shows a lot of circuits and following them will take you to construction pages in most cases.be carefull when operating with mains - It bites HARD!

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  • rickharris commented on Downunder35m's forum topic The future of "mobile" energy...22 days ago

    Battery or more correctly power sources have a LONG way to go to make the electric car viable (despite what the UK government thinks).It's really hard to beat the energy density of petroleum. A lot of available power in a very small space, easily reloaded in a few moments and pretty commonplace. ie. what you can't get from underground you can make in the lab from plant based raw materials.I think the future may be the hybrid, a small efficient engine - perhaps a stirling type, running on biofuel with efficient capture of the emissions, this drives a generator to charge onboard batteries. Around the city you are almost stationary as much as you are moving so the amount of power used is low ad easily topped up. In the countryside, you get used to driving to suite your energy source ie. yo...

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    Battery or more correctly power sources have a LONG way to go to make the electric car viable (despite what the UK government thinks).It's really hard to beat the energy density of petroleum. A lot of available power in a very small space, easily reloaded in a few moments and pretty commonplace. ie. what you can't get from underground you can make in the lab from plant based raw materials.I think the future may be the hybrid, a small efficient engine - perhaps a stirling type, running on biofuel with efficient capture of the emissions, this drives a generator to charge onboard batteries. Around the city you are almost stationary as much as you are moving so the amount of power used is low ad easily topped up. In the countryside, you get used to driving to suite your energy source ie. you don't use power unnecessary just to go faster. Some kind of automatic control is probably required to combat the "heavy foot" syndrome.Many years ago (1060's) I proposed a town system where driverless cars followed a wire buried in the road surface, they picked up power from a slot in the road surface, i guess a contactless system could be devised these days. The guided nature and a central control system overviewing the onboard intelligence seems to me to be the way to go in town or city.The guidance wire would be easy to lay just a cut in the road surface, the rest is well understood robotic technology.

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  • rickharris commented on rickharris's forum topic Electric vehicle motor selection22 days ago

    Very useful and interesting and thanks for taking the time. More food for thought.

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  • rickharris commented on rickharris's forum topic WHY WHY WHY can't I post24 days ago

    30/april update the link now takes me to the correct place, however the draft instructable link still tales me to the front page.

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  • rickharris commented on rickharris's forum topic WHY WHY WHY can't I post4 weeks ago

    Log out log in same problemLinks from my profile page all return to the main page.If that's any help.

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  • rickharris commented on rickharris's forum topic Electric vehicle motor selection4 weeks 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 post4 weeks 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.4 weeks 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 post4 weeks 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 !4 weeks 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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  • rickharris posted a topic Electric vehicles4 weeks ago
  • 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 !5 weeks 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!5 weeks 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 soldering5 weeks 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 status6 weeks 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 floating6 weeks 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 soldering6 weeks 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!7 weeks 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!7 weeks 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 automation3 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 automation3 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 website3 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 redesign3 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!4 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 machine4 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 Camera4 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 5 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?5 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?5 months ago

    Laser cutter

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  • rickharris commented on randofo's forum topic Old How-To Books5 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?5 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 design6 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 size6 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.

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