Motor Info

[Adam Shapiro]

Thanks for the help. If I was to calculate using approx. 75% on the CIM and 85% on the drill would it work in practice or would the numbers only be usable in theory? For instance: if I wanted to get to 150 RPM I figured I could gear the CIM from 4200 (1->28) or the drill from 16800 (1->112), now if I was to use this in actual practice would it work well or should I expect torque issues?

[Max Lobovsky]

When using two different motors, you should always make sure that they are geared so their free speeds match. This means you should be using the same percentage of each motor In this case, the ratio between the ratios for drill to CIM should be 19500/5500 or about 3.7. (112/28 != 19500/5500). This is probably a bit hard to understand, but there are numerous posts about this all over the forum with much longer, and well written explanations of why free speeds need to match and such...

[Adam Shapiro]

Originally Posted by Max Lobovsky

This is probably a bit hard to understand

Actually that makes plenty of sense. Now I just have to work on getting numbers that are easy to work with as the drill's no-load speed is something like 19,760 RPM ...

[Kevin Sevcik]

Originally Posted by Adam Shapiro

Actually that makes plenty of sense. Now I just have to work on getting numbers that are easy to work with as the drill's no-load speed is something like 19,760 RPM ...

John V-Nuen has made up a rather extensive spreadsheet to help with all sorts of things, one of which is the combining of different motors. I haven't looked at it recently, but it has gotten fairly good reviews.

Whitepaper