I’ve been very interested in 90 degree drives once I saw @Linny post his awesome build using a set that are apparently not available anymore. About a year ago, I mocked up a very basic spiral bevel gear setup to test on the bench. Results were promising, but I left it at that. I have since revived that project, and will be making a few sets for testing as I feel comfortable with the latest design For now, it will be a 2:1 gear ratio, with a kegal adapter to fit mad 105mm wheels.
How viable is it to increase the gearing ratio? If you’re limited on space for the wheel gear, what about a dual stage reduction? 2:1 is okay, but if you’re wanting to run crazy large motors for power, the ability to run some truly crazy reductions would be awesome haha.
2.0 is perfect for 100mm wheels.
I ran 2.2 on mads for quite a while, the extra few mph will be welcome. 2.2 capped at about 42mph.
Clearance on bn street drives were not great…
2.2 works yes, but a higher reduction would let us run higher kv motors, and push more amps - more performance if you want it. Why not make a secondary reduction stage that can be removed from the 90 degree drive, allowing you to either run it at 2.0 or add on a secondary stage to get more reduction?
2;1 is not my ideal ratio. I bough these gears off the shelf for another project, but needed to modify them for this purpose. I’m using them as a test bed for the overall design concept. If things go well, I will modify the ratios accordingly.
Watching! I think 2.7 to 3 is a good ratio personally. 190kv is the best motor choice, and it would allow for slightly higher voltage, if you were to go for 170kv
