Quote:
Originally Posted by GeeTwo
As I understand it, the advantage of cycloidal is the larger ratio of reduction available in a single stage, improving efficiency. Stacking gearboxes that match VP ratios would give up that advantage.
If you made cycloidal gearboxes at ratios of 36:1, 40:1, and 45:1 that could take a VP output as input, then with a single VP and a single "VC" (VersaCycloidal) stage, you could cover the range from 108:1 to 450:1 with no gaps larger than 12.5%.
Here's the table:
Code:
Cycloidal Ratio
VP 45 40 36
-----------------------
3 135 120 108
4 180 160 144
5 225 200 180
7 315 280 252
9 405 360 324
10 450 400 360
Of course, you must put the versaplanetary first because they couldn't take those large output torques. |
The problem is, a 10:1 reduction is pretty much the biggest size you can make using 1/8" pins and a 0.03" eccentricity. If I made the gearbox a little bigger, I could add more reduction.
I figured the low backlash and backdrive resistance would be worth it.