Alternatives to RS775

[JesseK]

There are some options.

Option 1: Hollow out this pinion (or a gear with the same specs) that mates to this AndyMark Planetary Gearbox, then modify the gearbox to add the mount holes for the RS775, then put that gearbox anywhere you can put a CIM. Read this, all of it. You will need some pretty decent machining capabilities.

Option 2: Use a CIM on the arm to test. Then wait for Banebots to get it together and replace it on the Thursday of competition.

At either of those points, however, it may be easier to use the FP motor if you're only using 1 motor for the arm. Given that you need to gear anything down by quite a bit (1000:1 or more) in order to easily control the arm (2 seconds per 90 degrees), you could probably get away with that. With such a long arm, the manipulator will have to handle the forces of accelerating to and from over 10 feet/second at the tip.

[fox46]

If you look at the spec for the RS775-18, what else uses an 18V DC motor?

Try to find a cordless drill with a similar motor and then cannabalize it for its gearbox! Thats my contingency plan. You will find that the Banebot motors are very standard in their mounting and shaft configurations and I'd bet it's pretty easy to match it up to an 18V drill with the same if not very similar motor. Just remember that a drill is not designed to take sideloads so you must isolate them using external bearings. Anyone who was around in 2000-2001 (?) possibly earlier can attest to the importance of this!