Rover: Tracks or Tyres?

Hi guys, I'm building an adaptable rover system which should be designed to go over rocky/muddy terrain (just imagine the basic farm environment). As i am doing this for an A level project, can you help me decide whether tracks or normal wheels would be better? Thanks!

Topic by DELETED_ThunderVolt99 1 year ago  |  last reply 1 year ago

Wi-Fi controlled rover?

Building a wifi controlled rover with a cam mounted on top. Need help for programming and coding the atmega16 mcu and router

Question by gaurav.srm.1017 6 years ago  |  last reply 6 years ago

which one is better nano aurdino or transistor?

I am making maze rover (line follower) for the 1st time & i dont  know anything plz help me 

Question by lachuviswan 2 years ago  |  last reply 2 years ago

Tamiya vs rover 5?

Hi, I want to buy a platform for my arduino and i was just wondering what was the nicer one? Tamiya or rover 5 regarding Speed. Torque. Size. Ease to use. Off road. What do you prefer to use?

Question by David97 5 years ago  |  last reply 4 years ago

Which travel guitar?

I would like to buy either the Martin Backpacker or the Washburn Rover. The Rover is cheaper, and comes with a hard case. But, the Martin is a better quality guitar. What do you think?

Question by freeza36 6 years ago  |  last reply 6 years ago

Watch engineers build a Mars rover!

This is super-cool. NASA's JPL has set up live streaming video from inside the clean room where they're building the Curiosity rover, formerly known as the Mars Science Laboratory. Work is from 8am-11pm PDT Monday through Friday. I found this on Saturday morning and I've been waiting all weekend for those slacker engineers to get to work so this would be worth posting. Some comparison: The old Sojourner rover from 1997 was the size of a largeish R/C car. The Mars Exploration Rovers from 2004 that are still running (!) are the size of golf carts. This thing's the size of a Mini Cooper, and has a proportionally larger load of sciencey stuff packed on. Instructables doesn't allow you to embed Ustream into Forum topics, so you'll have to go to Ustream to watch: Via Bad Astronomy Blog, image from MSL website

Topic by CameronSS 8 years ago  |  last reply 8 years ago

High Resolution view of Victoria Crater on Mars

NASA has released a beautiful high resolution picture of Victoria Crater (below) taken from the Mars Reconnaissance Orbiter. If you zoom in on the full resolution image, you can see the Opportunity rover's tracks and stopping points (faint lines with bright dots) around the left part of the rim.The photo was taken in July 2009, so many of Opportunity's tracks have already been obscured by wind and sand.

Topic by kelseymh 9 years ago  |  last reply 2 years ago

Mini fuse box question?

My headlights have stopped working - main beam is OK, sidelights are OK, normal dipped beam is out. Since both sides went at once, I'm assuming its a fuse. However, there are 24 fuses in the fuse box, none labelled with what they serve, and the Haynes manual simply gives them numbers. I'm being lazy - to save me going through them one by one, does anybody know which fuse is the one I need to change? (Rover Mini Mayfair, 1275cc, 1995)

Question by Kiteman 8 years ago  |  last reply 8 years ago

tell me something about tip and ring in cell phone operated land rover?

Wants know about "tip" and "ring" in cell phone operated land rover

Question by vinod.minhas 9 years ago  |  last reply 9 years ago

JPL completes mockup of Spirit, to test extraction procedures

NASA/JPL released a cool picture today, showing their engineering rover embedded in sand with a rock underneath. This is as accurate an emulation of the Spirit rover's situation as possible. The mockup will be used for designing and testing procedures for getting Spirit unstuck and moving again (or for determining that it can't be).NOTE: I'm not able to upload images for attachment to this topic (see my bug report). If that gets fixed some time soon, I'll update this.

Topic by kelseymh 9 years ago

Looking for a good tracked arduino platform?

Hi, I want to get a good tracked platform for my arduino. I was looking at the dfrobotshop rover but decided that it was too pricey and slow for what I wanted. I was also looking at the tamiya and rover 5 platforms but decided that they all were too slow (but had a appealing prise range). Anyway what would be a good cheap track platform for arduino that had some speed? Thanks, David.

Question by David97 5 years ago  |  last reply 5 years ago

I want to improve my "Rover App-Controlled Spy Tank"

Hello everyone, I thank you for taking the time to read this. I just bought a "Rover App-Controlled Spy Tank" from Brookstone. I like the tank, but there are a few things that I would like to improve one it. For a spy tank the motors that drive the tank make way too much noise.  Does anyone have any tips on how reduce the amount of noise the motors are making? I would like to lower the height of the WiFi antenna, and boost the range the the antenna. Does anyone have any tip on the best way to do this?   Here is one of the many reviews on Rover on the web. LINK Thank you again for your time, and any help you might have for me.

Topic by SeanD13 7 years ago

Help Interfacing ps3 controller with arduino wirelessly without computer. Answered

I want to purchase the dfrobotshop rover found here:( it is no fun without the goodies,which poses the challenge of controlling it with a ps3 controller wirelessly without a computer. If someone could tell me what hardware to use and get me receiving data from the controller via bluetooth in the serial monitor   It  would be greatly appreciated Thanks in advance,bye!

Question by Aperture Laboratories 6 years ago  |  last reply 6 years ago

Tips needed on the best way to improve my "Rover Spy Tank"

Hello everyone, I thank you for taking the time to read this. I am sorry for the report, but after posting in the tech area. I realized that I posted  it was in the wrong area.  I just bought a "Rover App-Controlled Spy Tank" from Brookstone. I like the tank, but there are a few things that I would like to improve one it. For a spy tank the motors that drive the tank make way too much noise.  Does anyone have any tips on how reduce the amount of noise the motors are making? I would like to lower the height of the WiFi antenna, and boost the range the the antenna. Does anyone have any tip on the best way to do this?   Here is one of the many reviews on Rover on the web. LINK Thank you again for your time, and any help you might have for me.

Topic by SeanD13 7 years ago  |  last reply 7 years ago

How to make a robot rover that can be controlled via internet? It should be controlled from anywhere in the world.

Hi guys.i want to submit an innovative  project to the school science fair.but i think i have the idea but don't have much time to think about it cause exams are coming... So here is my idea; A robot rover that can be used for spying or can be used to explore areas where human interaction is not war fields etc.. so,most of my school mates put forward some ideas to make them manually controlled.But  i want to control it in a different manner.Because judges always notice the area that can be covered by the controlling Radio frequency or IR . So i have an idea that, It should be controlled via an internet page or whatever suitable.Because it must be used wherever the internet is available. Like from one state to the other state or etc. i.e. situations like the controller and the robot is in different states or districts. also i want to add some cameras and voice recorders in it.So the photos and sounds from the rover should be automatically uploaded to a particular web host (that i want to create my self) and then the controller can download it whenever he/she wants. Guys this is my final year and my dream project..I still Hope there will be some way N.B: I PREFER ARDUINO AS THE MAIN BRAIN / MICRO-CONTROLLER              Because i am familiar with that  TO ALL MEMBERS OF INSTRUCTABLES FAMILY....I REQUEST SOME ADVICE AND HELPS I NEED HELP FOR THE PARTS NEEDED FOR THE CONTROLLING..AND THE CODES FOR IT (EXAMPLES ARE INEVITABLE PLEASE)

Question by Navaneeth V 3 years ago  |  last reply 3 years ago

TFT dashboard retrofit

Hello all please can you help me anyoneI want retrofit adapter can bus TFT dashboard for range RoverI want apgrade instrument culstaer 2007 to2014thank you

Question by labeed 5 weeks ago  |  last reply 5 weeks ago

stair wheels

Inspiration:  How to  Motorize such a thing as the latter 2?  I also recall a 6 wheeled motorized hand truck in a Silence of the Lambs sequel.  Cant find that image, tho.

Topic by Toga_Dan 4 years ago  |  last reply 4 years ago

Wheel Leg All terrain design

I came up with a wheel leg design a while ago Vex came up with this product and it looks a lot like my design. I think this would be a great design for an mars rover. I got the idea from rex robots. I thought, " Why not put more of those on?"

Topic by starwing123 10 years ago  |  last reply 10 years ago

NASA sent me a gift!

Hey guys, If you have or haven't known I've been an active participant in the NASA moonbuggy program throughout highschool. Every year NASA has a competition where schools, colleges, and universities throughout the world create moonbuggys and compete on a "moon course" in Huntsville Alabama for the fastest time (if the moon buggy even makes it across the terrain) Anyway, while I was in the competition there was a special event where you can have pizza with the "pioneers" (the archaic dudes that actually made the moonbuggy). It was an offer that I couldn't reject! So, I attended the secret meeting and we got to ask the "pioneers" questions. My question basically was: "If you had today's technology, what would you change about the moonbuggy?" I was looking for an answer that describes a superconducting hovercraft, but they instead talked about changing the radiator (lol, well it an awesome experience either way). What I didn't know was that my question was nominated for the "best question award" and they sent me a lunar rover book signed by the pioneers ( “Sonny” Morea, the project manager of all the space procedures at the time signed it. I don't know if it means anything to anyone these days, but it means somethin' to me!) Thats all. Thanks guys!

Topic by husamwadi 5 years ago  |  last reply 5 years ago

Power source for running three 2000rpm gear motors?

So I have built a rover drone (instructable coming up soon) and the major problem is I don't know what power source I should use. It has three 2k rpm gear motors, an Arduino and a raspberry pi. Would a lipo suffice this? or should I use something else? Image source:

Topic by droiddexter 3 years ago  |  last reply 3 years ago

How to convert analog MQ4 sensor output to ppm

Hi everyone,  My final year engineering involves a rover that can sense methane gas. Initially the idea was to just detect the gas as digital input but now i wanna do a bit more. I've searched all over the internet on how to convert the analog values to ppm, but couldn't understand any of it. I'd be really great-full if someone could give me the formula or the code to do this.  I don't intend on calibrating the sensor to find precise answers, just a rough picture of the ppm values is enough to begin with. Thanks a lot in advance. 

Topic by ZeeshanA27 2 years ago  |  last reply 10 months ago

Ideas for a creation?

Hi all, I've got an opportunity to lay hands on this sweet wifi webcam: Thing is, I've already got one monitoring my 3D printer, and I'm not exactly chomping at the bit to spy on my roommates when I'm away.  I've got a couple ideas about what to do with it, but I thought I'd throw it open to the community:  got any cool ideas for interesting ways to use/alter/hack/repurpose something like this? Currently I'm considering tearing into it and using the remotely controllable pan and tilt motors to turn it into a mars rover for my house, possibly fitted with a laser to annoy my cats.  What do you think? Ian

Topic by depotdevoid 3 years ago  |  last reply 3 years ago

How do I control this motor? (speed) wise? Answered

I am making a go kart, to be converted to a lunar rover for a carnival. I am about To purchase to 350w 24v dc motors (geared down of course) But how to I control them? After looking at 'how to build an electric racing car' Instructable I found that there solution to the problem was to use a heavy duty push switch.. I was thinking that this would be a bit frantic and stoping and starting a whole drive system could do some damage. I found this.. But how do i use it ? I dont really understand it? I am ringing the company up this week as they seem to have all of the drive systems bits I need. I would really like any suggestions on other ways to my solution. Thanks Oscar

Question by oscarthompson 9 years ago  |  last reply 9 years ago

Solar charging a battery with Arduino?

I am making a solar rover robot using an arduino duemilanove. I have a 12 volt solar panel and a 9.6 volt nicad battery. I am wondering if this circuit I sketched would allow me to prevent the battery from over charging. The battery is monitored by dividing the voltage and connecting it to analogue input on the arduino. When the battery is fully charged, the arduino sets an output pin HIGH and breaks the connection between the panel and the battery using a PNP transistor. Does the transistor subtract current from the circuit? In the open state will there be more than 9.6 volts entering the battery? here are some links to the robot so far! (without solar installed) Pics! http:// Video!

Question by Revolt Lab 8 years ago

Using an Arduino's PWM to control a DC motor hooked up to a SainSmart L298N board?

Hi Instructables! I am new to making electronics, completely. So please let me know if I am doing anything wrong. I am working on making a UGV rover based on an Arduino UNO R3 and accompanied by a SainSmart L298N Module (to drive 2 DC motors). I am capable of getting the DC motor to work in either direction but don't know how to control its speed. pins 5 and 6 are either high or low (always opposite) to control direction, pin 11 enables the motor. The board is powered by the Arduino's 5v power supply. Here is my setup (it's just really basic so far): void setup(){   pinMode(11, OUTPUT);   pinMode(5, OUTPUT);   pinMode(6, OUTPUT); } void loop(){   digitalWrite(11, HIGH);   digitalWrite(5, LOW);   digitalWrite(6, HIGH); } If someone could show me how to control motor speed using this setup it would be very helpful. Thanks!

Question by Knight67 5 years ago  |  last reply 5 years ago

64 w solar panel without a charge controller or battries but using a buck converter for direct regulated power?possible?

Greetings and thanks in advance for all the help. i shall start with explaining the situation.  i am going to be in the remote himalayas for about 2 months with a expedition team and for all our charging needs  we are going to carry a few solar panels, most of them are small 5-15 watt ones . the problem comes in when i introduced the 64 w thin film roll able panel. the specifications for the panel are as follows Model PVL-64 Rated Power 64 (Watts) Rated Voltage 16.5 (Vmp) Rated Current 3.9 (Imp) Open Circuit Voltage 23.8 (Voc) Short Circuit Current 4.8 (Isc) i intend  to use 3 LM2596 ebay buck converters to get 12 volts and 2 5V USB Output Converter DC 7V-24V To 5V 3A Step-Down Buck KIS3R33S Module KIS-3R33S for usb power. All of these will have a common source of power (the solar panel) and have separate outputs as i need to charge multiple things at once.  will this setup work or i need to think of something else.?

Question by 1st rover 3 years ago  |  last reply 3 years ago

Renewed Interest In Space, Lunar Explorations

Japan's space agency today launched its much-delayed lunar probe in the most ambitious mission to the moon since the US Apollo space flights.The Selenological and Engineering Explorer — or Selene — probe was launched on board an H-2A rocket from Tanegashima, the remote island location of the agency's space centre..............................Japan's mission comes at a time of renewed interest in the moon. China plans to send a probe, the Chang'e 1 to the moon, possibly this month. The Chang'e 1 orbiter will use stereo cameras and x-ray spectrometers to map three-dimensional images of the lunar surface and study its dust. China's official Xinhua news agency has reported that a manned probe could be launched within 15 years. Japan is also considering a manned mission by 2025.Meanwhile, Google has launched a $20m (£9.9m) competition to send a robotic mission to the moon. To claim the prize, a team of researchers will need to send a rover to the moon, make it roam for a minimum of 500 metres and send video, images and data back to Earth, all before December 31 2012.Full article hereRelated Articles:UK astronaut on moonIndia's unmanned probePlan for spaceport in SingaporeEverybody else want to go to space too..

Topic by gyromild 11 years ago  |  last reply 11 years ago

Battle Bots Contest!

So, if you've seen the movie Real Steel you know what i'm talking about. Real Steel is boxing, fighting and wrestling humanoid robots. I posted this contest because I wanted to see how many people can make a humanoid that works, or modify a humanoid hat you can buy. Zibits, mini robots (about 3 in. tall), are pretty cool, saying that they only go forward, or 360 degrees. You can hack em, fight em and play with them. Also, WOWWEE makes really cool humanoids to hack into, for example Full sized Robosapien and Femisapien. Tri-BOIT and Robo-ROVER. Post an Instructable with a video if you want to, and please make a step by step guide on how to make your battle bot. If you make it from scratch you have a higher chance of winning, if you hack a ZIbit or make a mini robot you might win the mini battle bot contest. Wowwee toys are big so those are the big robot humanoid contest. Be creative and express your ideas, and remember you always have a great chance of winning. The naming of the robot types were just an example of cheap stuff you can find in most stores, use whatever you'd like to make the ultimate humanoid robot contest. If there are a  lot of people there will be one , to three, maybe five winners, if there are less than 10, there will be multiple winner depending on size, type and what they do, but there will always be one grand prize winner. Enjoy! Contest ends when I want it to.

Topic by thrashermanTotalDIY 7 years ago  |  last reply 7 years ago

Pager motors: Removing weight and driving wheels

Hello fellow life forms, I am currently working volunteerily at a local school, teaching young kids a bit about telescopes and astronomy. One topic I am currently planning is the mars rover(s) and I am planning on building a simple line follower as activity. As the budget is very low but I still want the kids to be able to build something to take home I am trying to keep it as simple as possible. After I ordered a pager/iphone motor a year back or so, I now ordered 100 vibration motors for $28.50 at aliexpress. They work fine but are smaller then the one I had before, a rubbery encasing makes them the same form factor.  (excuse the horrible pictures, I just have a older android phone) 1) The first problem is removing the weight. I have searched and found several tutorials (for example and aproaces, heat and regular pliers failed, for everything else I lack smaller tools.   I consider ordering those grip pliers here in germany, which one would be better?;=item233228bf95 or;=item3cdd210995 I also considered a watch wrist band tool as I have only a limited set of tools,;=item566039355f or;=item1e8539d1a5 or;=item485b0c8224 But I don't think I can adapt them to hold the motors. Any other tricks? 2) The second problem is to drive small wheels with those motors. With the vibration weight attached I can't drive a small foam or cardboard wheel, neither via friction nor a rubber band/belt. I hope it will work once the weight is off. I hope I can solve this issue, else I am stuck with 100 motors that are only suitable for bristle bots ;-) The vibration is strong enoug to move something, also attaching the motors to a cardboard square and directly touch the ground seems to have enough power. I could use a 3d printer to print a gear, but I would like to keep it as simple as possible. Also the groove bearing + shrink tube drive I have seen on another project would not be ideal to build with younger children. I initially was thinking of using bottle caps as wheels and wrap the motor axis with shrink tubing or isolation tape to drive the bottle cap by friction. Thanks for any ideas, advice or suggestions! -Marcus

Topic by schorhr 5 years ago  |  last reply 5 years ago

Yuri's Night Bay Area: updated science/tech/art lineup announced

Prepare for Liftoff! Get ready for something entirely different. On April 13th the Bay Area joins the world in celebration of space exploration in a unique convergence of artists, scientists, astronauts, performers and musicians. Yuri's Night is a commemoration of humankind’s first venture into space, by Russian Cosmonaut Yuri Gagarin. This gathering bridges national, cultural, generational and social barriers to ignite excitement about what is new on the horizon in space exploration and to remind us of the magnificent feats humanity is capable of. Yuri's Night Bay Area will be held at Moffett Field in the NASA Ames Research Center's massive SOFIA hangar, home to the world's largest aerial observatory. Our host for the evening is pioneering space traveler Anousheh Anasari, the first privately funded female to reach orbit. She is joined by Dr. Chris McKay, world renowned expert in astrobiology and terraformation with the Space Science Division of NASA Ames Research Center, as they welcome you to a dazzling array of interactive art installations and science demos, interwoven with musical and acrobatic performances by some of the world's finest entertainers. Cutting-edge interactive technology and live demos will include: Neuro feedback games and visualizations including Telekinetic Asteroids and Mind RipplesExplorations of the world through NASA World Wind and Gigapan, the high-resolution panorama projectPortals into Second Life and Burning Man Earth, Google's Black Rock City browserA roofless stargazing lounge, with an exceptional telescope provided by NASASquidlabs' Instructables and ground-breaking kite technologyScience demonstrations and innovations from the worlds of robotics, engineering, biology and astronomy, will also be on display: A talk and interactive demos from a senior SETI scientist on efforts to detect earthquakes from spaceExplorations of Techgnosis by Erik DavisInteractive next-generation science data visualization software from NASA Ames' Astrophysics DivisionRobots from Justin Gray, Carnegie Mellon University, and NASA, including the next generation of roversExclusive heavenly imagery from SloohDisplays of microbial fossils, live microbial mats, and magnetic and fluorescent bacteriaASME's human-powered vehiclesEngage with space-inspired and technology-infused art installations, including: StarZipper, the 200 foot high installation powered by LEDs and Helium created by internationally renowned artist Michael Light and collaborator Dave RattrayPeter Foucault's self-propelled motion sensor Drawing RobotsSpot Draves' collaborative evolutionary high-definition visual algorithm generator, Electric SheepDynamically inflating sculptures by AKAirwaysHypKnowTron and ChakraTron, the interactive light sculptures by GaspoExperience rare video works documenting art in space: Matières Chorégraphiques by Kitsou Dubois, celebrated French dancer, choreographer and artistic director of Ki ProductionsProjects from the Zero Gravity Arts Consortium, Lowry Burgess's monumental project The Seed of the Infinite Absolute, Lorelei Lisowsky, and Frank Pietronigro's 'Drift Painting' in microgravityMeet Japan's space artist Ayako Ono and watch Jean Luc Soret's Space Art videos, direct from Paris's International @rt Outsiders Festival.The Documentary Dome, featuring our planet's greatest space documentariesWitness awe-inspiring space-themed performances by an armada of acrobats and dancers, featuring: KC Bella Fuega and Spiral Hoop Dance (orbital hooping and bellydance)Flowtoys (celestial light performance and UFO flowplanes)VigilAntiUP (intergalactic stilting)A Parade from the Future (with cutting edge Bay Area circuit benders and other worldly creatures).Live dance and acrobatics fused with audiovisual performances, will be coordinated with a world-class lineup of live electronic music: PLAID - Warp Records, UK TELEFON TEL AVIV - Hefty Records, Chicago (special early evening set) BLUETECH - Aleph Zero, Native State, Portland OOAH + BORETA - Glitch Mob, LA/SF SUTEKH - Context, Soul Jazz, Leaf MR. PROJECTILE & JONAH SHARP (aka SPACETIME CONTINUUM) - Merck, Reflective, Astralwerks RD - Designed Disorder, Glitch Mob, LA WELDER - Cyberset MOZAIC - Nexus DR. TOAST - False Profit Music environs will be complimented by a team of visual artists -- including KOSHO, CELESTINESTAR, RECURSIVEVIDEOLAB and VIBERATION -- spinning light into space throughout the night. Meanwhile, outside on the tarmac, the SPACE COWBOYS will have their own dynamic lineup of djs aboard their interstellar party transporter, the UNIMOG. Also on the tarmac will be Playaflies and Rabbit in the Moon's outside VJ set PLUS large scale sculpture and multimedia installations from the bay area's finest and beyond. This year’s theme is the greenification of space. The event is bio-diesel powered, a variety of organic food and drink will be available, waste products will be composted and recycled, and one tree will be planted for every ticket sold in an effort to offset the event's carbon emissions. Come join us in celebrating the accomplishments of mankind on a collective cosmic journey to the depths of space and beyond. Brought to you by Nexus, Symbiosis and so many others. *********************** Friday, April 13th, 2007 Event opens at 6:30pm NASA Ames Research Center* Moffett Field, Mountain View, CA, 94035 Tickets are on sale now. Limited $30 presale tickets still available, but not for long! Purchase advance tickets at: VIP tickets available. Privileges include: VIP room overlooking the main floor, open bar and food throughout the evening, a chance to meet silicon valley innovators and dynamic thinkers, exclusive Bay Area Yuri's Night memorabilia and much more to be announced. PLUS! Space Cadets are invited to go weightless and experience zero-gravity on Sunday, April 22, 2007! This unique VIP experience will provide you with a ZeroG flight flown from San Jose International Airport PLUS exclusive access to all Yuri's Night Bay Area 2007 events. 3-2-1 Liftoff! VIP Flight Tickets $5,000.00 each. Email to reserve your seat today. Don't let this zero gravity opportunity to fly float by! As always, please check for the latest… Yuri's Night Bay Area Crew, Over and Out. End Transmission.++++++ Any special requirements for individuals with disabilities should be related to the event staff or security, and reasonable arrangements will promptly be made. An ADA/Handicap parking lot will be available and marked with signs. References to NASA Ames shall not be construed as official NASA approval or endorsement of any non-Governmental or commercial entity or activity.

Topic by lannanh 12 years ago

Hack your Servo V1.00: Make a powerful linear actuator using a standard hobby Servo

Hack your Servo V1.00: Make a powerful linear actuator using a standard hobby Servo   Provided you have the tools and the servo you can built this for under a couple of bucks. The actuator extends with a rate of about 50mm/min. It is rather slow but very powerful. Watch my video at the end of the post where the small actuator lifts 10kg vertically.   Materials List Tools list   - hobby servo - standard hobby brass tubing             -OD: 4.0mm, ID: 3.4mm             -OD: 5.8mm, ID: 4.5mm - standard hobby styrene tubing                                                 -OD: 4.8mm, ID: 3.5mm - M4 studding - 2 x M5 washers - 2 x M4 nuts - 5 minute epoxy - cyanoacrylate - grease - multi-strand cables - heat-shrink tubing   - standard tools – screwdrivers, scalpel, files etc. - dremmel multi-tool with ceramic abrasive disk, or similar - hand-drill + 4.9mm + 2.5mm drill-bits - M3 tap - M4 tap - soldering iron - glue gun - small vice - small saw - sanding paper (relatively fine) - small flame torch Procedure - I will be giving instructions based on the dimensional parameters of the Hitec HS-300. The procedure remains the same for any type servo. I strongly recommend you read the whole post before you start. So lets make a start, shall we?   - Open your hobby servo, remove control electronics, feedback potentiometer and mechanical stop on the servo’s output gear.   - Solder new cables on the servo motor’s leads.   - Drill two 4.9mm holes on the servo case bottom cover. These should be located longitudinally along the centre line and 9.5 mm from each end (this applies on the Hitec HS-300 and is also true for many standard servos but depending on your servo type there might be differences). The M4 thread will come out from the servo body using one of these two so this hole must be located directly below the centre of rotation of the servo’s output gear. Be very careful since this alignment is very important! If you don’t get it right you might have to use a new servo! The more accurate you are, the longer your servo will endure. -  Measure the dimensions of the rotating shaft of the potentiometer on the servo’s original electronics – note the geometry in general. The shaft should be flattened right at the tip in order to prevent it from freely-rotating once inserted into the servo’s output gear.   - Take the M4 studding (M4 thread) pick one end and by using the dremmel and the abrasive wheel tool, replicate the tip of the servo’s potentiometer on that end. Start by decreasing the diameter of the thread, rotating it steadily by hand against the abrasive disk (normally to 3.5mm in diameter and at least 6mm in length). Try to think of your fingers as the chuck of a slow-turning lathe. Once the diameter of the thread is down to the pot’s shaft diameter, flatten the tip according to the potentiometer’s tip. The idea is that the thread must be inserted in the servo’s output gear in the same way the potentiometer did before. The better the fit the longer your servo will endure. - On the flat tip of the M4 thread, screw the two M4 nuts approximately 20mm down its length. Following that, insert the two M5 washers. - Insert the thread inside the servo and adjust the distance of the nuts and washers down the thread such that the servo case bottom cover closes properly and the motor rotates efficiently. Basically, you have to make sure that once the thread and the servo are assembled there is no pressure between the servo case bottom cover and the nut-washer assembly. Similarly, you have to make sure that once the thread and the servo are assembled there is no gap between the servo case bottom cover and the nut-washer assembly. Once again, the better the fit the more your linear actuator will endure.   - Once you find the optimum position carefully disassemble the servo, remove the washers from the thread and use a drop of cyanoacrylate on the side of the nut that was in contact with the washers in the assembly. Let the glue to settle for 5 minutes. Unscrew the second nut by 10mm towards the flat end of the thread, and prepare a small epoxy mix.   - Put the mix between the two nuts and screw the second nut back in place. Once in place also use some epoxy on the back of the second nut as well. Ideally you should sand all contacting areas before you apply the epoxy glue. Leave to settle for at least 6 hours (even if you use a 5 min epoxy). - Secure tightly the 4mm diameter brass tube onto a vice by flattening the mounting end and use the M4 tap VERY carefully tapping as deep as possible (at least 15mm). Using the dremmel cut 10mm out of the threaded part of the tube and then verify that the created thread runs along the whole length of the small threaded tube by screwing it onto an M4 screw. Keep the 4mm threaded tube on the screw for handling purposes. Apply a layer of solder on the outside surface. - Take the 5.8mm diameter brass tube pick one end and try to sand at least 5mm into the tube (on the inside). Mount the brass tubing on the vice without squishing it and apply a thin layer of solder on the inside.   - Ignite the flame torch, take the 4mm threaded tube (holding it by the screw) and move it on the soldered end of the 5.8mm diameter brass tube which should still be mounted on the vice. Using the flame torch heat-up both tubes and carefully insert the 4mm threaded tubing inside the 5.8mm tubing until is fully inside. Use a pair of pliers and insert the brass tube by holding the end of the screw that sticks out. Hold the threaded tube levelled inside the 5.8mm tube until the solder settles. If you do not have a flame torch use a candle, your soldering iron and your patience :). Remove the screw. The end result will be the cylinder of your linear actuator. - The cylinder length should be equal to: the actuator’s desired working length (stroke) + length of the 4mm threaded tube which is inside the 5.8mm tube + 10mm for the mounting hinge at the cylinder end.   - The thread length should be: the actuator’s desired working length (stroke) + length of threaded tube which is inside the 5.8mm tube + length of the thread which resides inside the servo casing, which is model-dependant.   - Take the non-threaded/non-soldered side of the cylinder and drill a 2.5mm hole through, 5mm from the tip. - Cover the entire length of the cylinder with heat-shrinking tube and cut-off any excess bits. The 2.5mm through holes made earlier on the non-threaded side of the cylinder are now covered. Use the drill again to expose them and tap them through, using the M3 tap. Screw a 20mm long M3 studding or simply cut-off the head of a 20mm long M3 screw. This will act as your cylinder mounting hinge.   - Take the 4.8mm styrene tubing and M4 tap it 10mm deep. Cut a small ring 5mm in length and screw it in the M4 thread fully, from the side of the nut that was in contact with the washers (long side of the M4 thread). This will act as bushing between the thread and the servo’s case bottom cover. Ideally you should use nylon, copper or metal bushing. - Secure the motor cables inside the servo casing using a glue-gun and use heat-shrinking tube to cover them. Assemble the servo including the thread, the styrene bushing and the washers.   - Screw-on the cylinder and you are good to go! Here is a video of the small actuator lifting 10kg For those of you that have watched my video on the MTR Rover     will understand where the idea of hacking the servo came from ;))   Soon we will be posting assembly instructions, code and schematics on how to modify a standard servo to get full PID speed and position control with 10-bit resolution over 360 degrees – continuous ;)     I look forward for your comments!    

Topic by Antonb 9 years ago  |  last reply 9 years ago