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anyone have an idea for a good knex solid axle suspension?

K so i have ideas for everything else, can someone come up with a good solid axle suspension for a rock crawler out of knex, i also came up with a torsion bar ifs set up...if you can make a SMALL cv shaft i could make 4wd steering and indipendant as well, but for now i want solid axle! lol i just want to see how many ppl can do all this, steering idea would be good too!

Question by aaronj    |  last reply


Is there an online source for small drive axles & solid rubber wheels ?

I've tried every phrase I can think of to search, but all I can find are wheels with bearings. I urgently NEED to replace the rear axle drive assembly on a small Mustang 8 riding  mower, (really small!).  Do I have to have the whole thing custom made?  Why does everyone assume that all wheels should COAST?  Seems like it would be easy to find a  3/4"X24" axle, with keyway, and suitable 10" wheels. but I'm wasting away without success.

Question by doggymama    |  last reply


convet a scooter wheel to haave an non rotating axle?

I want to convert an airfilled scooter wheel wit a solid axle and put a belt wheel on it

Question by mman1506    |  last reply


Remote Control K'Nex Car

Hello, K'Nexing community! It's been roughly three years since I last posted anything on Instructables. Anywho, I've finally gotten the motivation to create something out of K'nex, and also combine it with my favorite hobby of hobby-grade remote control cars.  This car that's featured would be a brushed, but also fast on-road cruiser. Features/Notations of vehicle: Powered by: 12T or 15T Brushed motor ESC: Old ESC from ECX Torment, or Traxxas Slash ESC RX/TX: Team Associated combo Servo: Team Associated servo Solid Rear Axle Power Source: 2S LiPo More details and pictures will be added over time, and hopefully it won't take another three years. XD I've also included a couple of pictures of my current RC cars.

Topic by beanieostrich    |  last reply


Help for completion of Knee Walker Project ?

Hi Everyone I have a problem with a project I started to overcome my unique disability , this project was to basically install low powered electric motor on a kneewalker so I could get assistance / go off-road , yet still use it manually if need be i.e. to get some exercise or more importantly if battery dies ( something I cant do with mobility scooter or wheelchair  ) The problem however is I cant do this myself due my disability ( weld it , use power tools etc ) so I had this person i meet on a another  forum who agreed to help me - but unfortunately he hasnt   - so instead I am trying to find a replacement for him or any one that is willing to help. The motor itself ( Motor - MW12B GoldenMotor  )seems to work fine using a Lyens controller , but  unfortunately there is no direct link to the hub motor whose details are below. Model: MW12B -- 12" Motor Wheel Voltage:36V (Brushless) Power Rate:250W Weight: 4.8Kgs You will have to got to the gm website on the link above click on hub motors and scroll down to find more details , including links to 3d drawings . You can see the motor itself working in following videos that were posted by the person who still has it video1 video2 video3 Due to the size difference of the wheel  ( 16" compared to the front 9" using MTB tires ) amongst other things, we were  trying to find a way to mount it that he suggested would probably involve having to weld on some strong rear forks from a bike  or perhaps something else. Ive included the whole assessment / plan we did based on our mutual ideas and discussions below for reference, but Im afraid thats pretty much it , as I dont have any of the parts here for reference or than the basic facts . If any ones interested in helping , or going me any advice Id be grateful for your suggestions , if any ones wants to offer their services at a price just send me a pm and we discuss things further. thanks for listening , heres the assessment / plan I mentioned.. -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- I need to figure out a rough plan for the wheel mounting, plus brake mounting. We need to get disc and caliper. We need to figure out what front wheels, how to mount them, and how to fix the sloppy steering. In order to go see a welder we need to know where to weld the dropouts, the caliper mounts, and what, if any welding to do at the front end. Assessment Frame - good, solid, heavy. bulletproof. Wheels - strong, solid, better made with bearings etc better than expected. but hard tires are not nice, and wheels are a little too thin and too small. I expect its easy to get hung up on small obstacles. brakes - crap. none existent basically. Just a bit of metal pushing on the tyre. Also the lever is either crap or a bit broken. need to inspect it. steering - not very good but not crap. whole linkgae is a bit loose and wobbly, just held together by a few bolts. this means it has a fair bit of play in the steering. The whole thing with the bolts is that they have to be a bit loose otherwise the steering won't move. not a very good design. but it will do. handlebars/stem/steerer - designed to be collapsible easily, which is good, but there is also excessive play in this as well. it will do but its not great. ------------------------------------------------------------------ Thoughts.... Because there is four wheels, I found that on uneven floors (just around the front room the floorboards were uneven enough) one wheel is often off the ground a tiny bit. This would be solved by having 3 wheels or tyres with a bit of give in them. I would not want to keep any of the wheels. I would want to replace the front wheels with something a bit wider softer and grippier. like scooter wheels or MTB wheels. Brakes - the center of gravity is quite far forward. if it had brakes only on the front then i feel like it might tip over. then again, with the weight of the frame, the motor, batteries and person, maybe not. I will do some testing. Motors - Golden has the 8" single sided solid tyre motors that would be the easiest conversion, but I don't like the solid tyres and I don't like having 2 wheels at the back. I already ran into my foot. There is also the 8" double sided solid tire. This is not so easy either because it is the same size as the existing wheels therefore the axle would want to go exactly where the existing axles join. Could be done with cutting and welding but would be a pain, plus you still have the solid tire etc. I held up a 12" dinner plate and I reckon it would not look so bad actually. I will take some pics tomorrow. It looks like we would need to cut off a bit of the back section and weld on some dropouts, a bit higher up and further in than the existing axle mounts.. It looks like it will fit under the knee platform ok as well. Controller - because we may well end up with a motor that is not exactly right for the job, I think its all the more important we get a controller with some intelligence. Something programmable where we can set a low voltage, top speed etc. This leads us back to the GM controller, Lyens mini monster, or......I just thought, hmmm the kelly controllers are programmable - well they do a little controller that might be up for the job as well. In fact it looks the most programmable one so far. It is the mini one next to the coke can here: Hub & Wheel Motor Controller | EV Parts They have one that does 12-24v for $79 or $99 depending on max amps. You can get it waterproof for an extra $19 http://kellycontroller.com/kbs2405120a1 ... p-499.html It is fully programmable, see the software screenshots and manual here: Kelly KBS controllers online demo/help-Kelly Controls, LLC http://kellycontroller.com/mot/download ... Manual.pdf You need a serial port on your computer to program it, if you don't have one you need a serial to USB converter. They sell one for $29. Kelly are good controllers. I never thought of them until just now - I usually associate them with high power controllers for cars and motorbikes. When I used to work at Sevcon (who make argubaly the best...and most expensive...controllers you can get.)....kelly was one of the few competitors we kept an eye on. If you look at the setup software, you can fine tune min throttle, max throttle, max amps, max speed, all kinds of things. It will be just the ticket for fine tuning. --------------------------------------------------------------------- So........... This would be my personal plan right now - Electronics: $115 Motor - MW12B (GM) $98 kelly controller waterproofed $29 Serial RS232 to USB converter (from kelly) $20 throttle (max) $20 ebrake lever (max) $50 wiring, connectors, etc -------- $332 Frame / Fabrication: $50 old steel bike to steal dropouts off (maximum, probably less from craigslist or a garage sale) $150 to pay someone to weld the dropouts on and maybe brake caliper mounts plus machine front wheel mounts if necessary for new wheels (maximum) $50 (max) 2 front wheels MTB or scooter 8 inch with pneumatic tyres. $30 (max) new axles, bolts, washers etc $30 box for battery plus mounting bolts etc $50 (max) for respray or powdercoat frame (will be messy after welding. something to put the battery in ----------------------- $360 Brakes $20 (max) brake disk for rear plus screw on adapter for rear hub Brake discs $40 (max) brake caliper (cable ok, hydraulic not needed) $50 bolt on brake caliper mount (seen them somewhere but can't find right now) price is a guess. --------------------------- $110 Battery depends. I am clueless as to the requirements of this system. I can test with my own batteries once it is setup. Then we will know, but at a minimum you will be talking about 18 or 24v 10 amp hour. That is : $199 from ping

Topic by hele    |  last reply