Versaplanetary 3:1 and others sold out

[vigneshv]

Hi,
Does anyone know where we could get 3:1 versaplanetary stages? They are sold out on VexPro until May, and are back ordered on West coast products. Does anyone have stages that we could buy/use (we work in San Jose, CA)?

[Mike dennis]

You should try The Robot Space. They are also out of 3:1, but have most of the others in stock. The Robot Space (http://www.therobotspace.com/searchresults.asp?cat=1884)

[vigneshv]

You should try The Robot Space. They are also out of 3:1, but have most of the others in stock. The Robot Space (http://www.therobotspace.com/searchresults.asp?cat=1884)

Thanks for the suggestion. The issue is that it's for our shooter, so an adjustment from 3:1 to 5:1 would give us problems with power for our shot.

[cbale2000]

Thanks for the suggestion. The issue is that it's for our shooter, so an adjustment from 3:1 to 5:1 would give us problems with power for our shot.

What's your target RPM and what motor are you planning on using?

[dradel]

What motors are you planning on using?

[vigneshv]

What motors are you planning on using?

What's your target RPM and what motor are you planning on using?

We're using 775pro motors on our competition robot (which has 3:1 gearboxes) - these gearboxes will be for our practice robot (we were running those motors at 60% with the 3:1 gearboxes to get a long-distance shot).

[cbale2000]

We're using 775pro motors on our competition robot (which has 3:1 gearboxes) - these gearboxes will be for our practice robot (we were running those motors at 60% with the 3:1 gearboxes to get a long-distance shot).

You can get similar performance running a CIM or MiniCIM at a 1:1 ratio (the performance characteristics of a 775pro are almost identical to a CIM when geared to the same RPM). If you need to use the planetary for output shaft or mounting reasons, you could also just get a CIM Adapter (http://www.vexrobotics.com/217-4018.html) for it. Since you're currently only planing on running the 775s at 60% you have a bit of margin to play with as far as RPM goes.


Just a suggestion.

[dradel]

If you have the versa output sections I would just put a a mini cim on it with the adaptor and run it 1:1

[JesseK]

The VP uses mount holes on a 2" diameter circle. So does the CIM. This is not a coincidence, and the VP *can* be a drop-in replacement for a CIM and vice-versa.

As a result, you can use VEX's CIM-ile. It takes a 775PRO and gives it a spur gear reduction, and is a drop-in replacement for your VP's and CIM's. It gives you the output RPM of a CIM - slightly less than a 3:1 VP but definitely more than a 5:1 VP.

AndyMark sells a CIM-mounted encoder, if you need to replace the VP encoder.

We went to CIM-iles because one of our 3:1 reductions is a bit less efficient than the other, and we've stripped 2 of the VP 775 collars. These motors are so durn powerful...