Recent content by Vadim

Looks vary good, I pulled an Arduino mega (atmega2560) out of my drawer and thought it would do nicely. Then found this thread, looks like it'll save me a lot of work :P Edit: Though I em looking at the Atmel ATA6870 as it's a cheaper chip and requires less external components.

I do stress calculations for gear size. Close to what I'd be building. Not ideal though, with case hardened 8620 gears one could be made about 1/3 the weight, and the correct gear ratio.

A bit of quick math wile watching tv. No-laod 14.3A at 72v 74v 134a max continuous 12mohm 84kv 5780rpm under load Max power 10kw 95kph top speed wheel 990rpm 20" wheel 1st 10:1 2nd 5.8:1 Edited for 20" wheel

Well, I found a good deal on Chinese mini lathe that's already converted, but if I don't get that then I'll do the conversion myself when I get the funds. A lathe is actually a far more versatile tool then a mill, as you can do a far amount of milling on one. PM sent.

Well an electronic shifter is probably the easiest anyway, so automatic shifting is easy after that, just a little atmega that cuts motor power for a split second while shifting (no clutch). I'll sketch up a 2-speed box for that golden motor. Done work for the summer, and not starting school...

A multi speed gearbox would be more complicated. But definitely possible. It'd probably be electric shift, it could even me automatic.

I'm under the impression that the shaft on most rc motors is removable, if that's so then a new shaft could be made. For a 9:1 gearbox A 14mm shaft with a 12tooth mod1 gear machined in the middle would be machined down to whatever the motor needs. output shaft would start life as a 38mm shaft...

Well, I got sick of SolidWorks, so I sketched this quick. This would be a 10:1 box, input and output sides milled from 1/2" aluminum, the rest 1/4" aluminum, with some 10x26x8mm bearings. Hobby king has a new motor "Turnigy RotoMax 150cc" good for a real 12hp, that size of gear should handle...

I'm buying the lathe for a hobby, making up the cost is a plus. Mudeling my way through SolidWorks (I grew up on CadKey, totally different). :)

I do have a preference toward gears vs. chains or timing belts. They have a slightly higher efficiency, especially if oil bath, a little more reliable, and lighter (though not that significant when compared to the weight of the batteries). I'll make some cad drawings of a 3 speed gearbox when I...

Well, a decent small lathe, with the tools needed to make spur gears and machine cases would be about $1750. Within my budget. I may add a rotary table to that though. The only thing I'd need to buy is bearings. :)

Well, I was thinking reduction only, but they would be made to order, so a multi speed box is possible. Edit: I could probably manage a sequential gearbox.

Well, I'd have to build a prototype first. But maby $250

It sound like you're on the mend, thankfully nothing broke that can't be fixed. Ya, steal is the way to go, steal is a lot more springy, and will flex with-ought damage, aluminum won't.

I figured this was a good place to ask. Is there any interest in a high quality gearbox for using rc motors? I was figuring a 1:10 oil filled gearbox would do for most larger motors. gears are more efficient then a belt (especially oil bath), and inside a box they would be well protected and...