Climbing with CIM's: Versaplanetary Vs. P80 Vs. Multistage Planrtary/Spur Combo

[billbo911]

Originally Posted by Saberbot

...

Our final option is to use a versaplanetary or P80 as a first stage (something comfortable, 20:1?) leading into a spur gear or chain reduction.

Anybody have any thoughts or comments? Please let me know If I have made any errors in my reasoning, I'm still a bit new at this.

Thanks!

Lowering the amount of reduction on the VP and adding an additional stage of chain or spur gear reduction is going to be a safe bet.

IMHO, stay clear of the P80, it has a storied history of failure you do not want to encounter 30+ inches off the floor.

[AllenGregoryIV]

Originally Posted by billbo911

Lowering the amount of reduction on the VP and adding an additional stage of chain or spur gear reduction is going to be a safe bet.

IMHO, stay clear of the P80, it has a storied history of failure you do not want to encounter 30+ inches off the floor.

This is the way I would do it. Perhaps as simple as a VP (20:1 or 15:1) and a 1:5.33 VEXpro Single Speed Gearbox.

[Paul Copioli]

All,

First off, the load rating for the VP is very comservative so I think using the VP in this instance is fine.

Also, since the rating is based on the ultimate stress failure of the aluminum hex, going to a single stage gearbox with a 7075 aluminum shaft (or unhardened steel shaft) won't be any better.

In any case, you should be fine with the VP direct to your output for the climber.

[Saberbot]

Wow!

That perspective is actually a little game changing. How would you feel about versas on a drivetrain?

[AllenGregoryIV]

Originally Posted by Paul Copioli

All,

First off, the load rating for the VP is very comservative so I think using the VP in this instance is fine.

Also, since the rating is based on the ultimate stress failure of the aluminum hex, going to a single stage gearbox with a 7075 aluminum shaft (or unhardened steel shaft) won't be any better.

In any case, you should be fine with the VP direct to your output for the climber.

Thanks Paul, I wasn't sure if the failure was caused by the spline or some other part of the shaft specific to the VP.