Quote:
Originally Posted by TheHolyHades1
Hello.
I was looking at designing a custom gearbox and came across the WCP center to center distance calculator. After playing with a couple values, I wanted to check if they were accurate. I downloaded the cad model for the VexPro 2 CIM ball shifter and discovered a problem; the distances calculated by the WCP calculator were significantly larger than those on the shifter. Namely, the distance between 40-44 gears should be 2.1020 inches. The shifter, upon inspection in solidworks, shows only a distance of 1.9882 inches center to center.
Could someone please explain this discrepancy? I fear that it may be me simply not using one of the two tools incorrectly, so I'd love if someone could clear up the issue.
Thanks,
Hades
http://www.wcproducts.net/how-to-gears/
http://www.vexrobotics.com/ball-shifter.html |
Could you be measuring point to point or shortest distance instead of center to center in SW? Sometimes SW decides to switch the measuring tool to closest or point to point measurements randomly, when what us FRC folk want 99% of the time is center to center (for holes, etc).
The nominal value for the 40-44 20 DP gearset is 2.1000". Whether or not you add in the .002" adder depends where you're using the gears in your design, and the quality of the gears.