As long as the motor fits between the tyre and the frame, fat tyres are no problem.scoobydrew wrote:Hi all. Just after some info if you guys don't mind. Will this type of drive work with a tyre like a big apple. My mtb doesn't have suspension and it's a bone shaker on hard road tyres. Looking to add friction drive but fancy some bigger softer tyres to smooth things out
Also, thinking of getting an SK3 63mm motor. If I also get an 80amp esc, throttle and servo tester would this combo work?
A simple setup with power meter will get you up and running, and in the meanwhile you can study some hardware and software design to build a system which will suit your needs.scoobydrew wrote: As I'm a simple mechanical engineer, maybe just a power meter or ammeter and keeping a close watch will have to suffice
What motor are you using ? On 6S ?Blanthegenius wrote:OK project completed...for now that is. Would like to replace the nylon to black and not sprayed black and complete the profiling so that it's got rounded edges all round, and will probably get some heat treated ali too.
EVTodd wrote: ↑Nov 10, 2010 6:43 amReally? I just drill a hole in the motor shaft and put a roll pin in it. Here's a photo. Doesn't show the pin but in the bottom one you can see where it would go.Kepler wrote:I think you have a fair point in relaton to over complication but I suppose it depends on what different people find complicated. I personally find the process of coupling up a roller to a motor just as complicated as making a swing arm for a direct drive setup.
As for a picture. Yup, it's an old picture but same old drive I've been making. That top plate doesn't slide, it's to stiffen the small channel aluminum I was using.
You have a good point about being able to totally disengage the motor. I think you missed the part of my post that said I'm still using a clutch bearing though, so the "plain ol'" version freewheels anyway. I have tried it without and the drag really isn't bad but it would depend on which motor you're using. Never had a hub motor so I can't compare the two.adrian_sm wrote: I would be really interested to see what sort of drag your "plain ol' friction drive" has. If it spins down faster than a hub, then personally I would probably just stick with a light weight hub instead. The fact that the variable pressure systems can totally disengage is the only reason I was keen to try it, and the only reason I would put up with some of the down sides of friction drive.
Don't get me wrong. I'm still using the sliding mount on my main bike. That roller would slip like crazy if I didn't. I'm just talking about low power "assist" type systems.
I think your drive is turning out great btw.