pic: WIP 3 CIM 2 Speed All Belt Cim Above Tube Gearbox

[Colin Small]

Originally Posted by asid61

Not quite all belt- the first stage is gears.
In any case, this is a very interesting concept. I really like your compact execution of the idea.
The one thing that I'm worried about: why 9mm wide 3mm pitch GT3 over 15mm wide 5mm pitch? Even using 2 parallel 9mm belts (which may face issues with not lining up), this looks like it may not be strong enough.
I thought this type of gearbox would be unworkably large, but the first stage gear takes up most of the reduction so it works out.
The flipped cylinder arrangement looks a lot like 192's gearbox this year.
What are the reduction ratios?

SDP doesn't make belts smaller then 40 tech so using 5mm GT3 would mean spacing everything out too much

What do you mean by the belts not lining up?

And yeah, I took a bit of inspiration from 192

I had the reductions written down somewhere but I think it's something like 10:1 and 20:1.