Simple (so i think) motor mounting question

[Jengles]

We are having some difficulty mounting a cim motor directly to a pneumatic wheel. We have the cim motor, pneumatic wheel, key hub from andy mark, key hub mounting kit also from andy mark, and the key stock to properly fit. We put the key stock in so the motor and wheel spend together. But what are we suppose to do to keep the wheel from lifting up? Thanks.

[EricH]

What's the application?

The simple answer may be to support the other side of the wheel, say with a connecting axle to the CIM's axle, or support the back of the motor as well. OTOH, the simple answer may be to use some other method entirely. Depends on the application.

[Jengles]

If we are using the wheel as a one wheel shooter like found in this other team's video http://www.youtube.com/watch?v=ARUhI8Qob5w , what keeps the wheel from falling down and off? (Or in our case flying up, since our motor is underneath?).

[DonRotolo]

Usually, one would use fasteners (such as 6 screws) to hold the wheel (which has 6 holes near the center, yes?) to the shaft coupler (which should also have 6 matching holes).

See this item, see how it has 6 holes in it?
The see how this item also has 6 holes? These should match up, and a bolt goes through each one.

[FrankJ]

I guess you are asking how to keep the hob from coming off the shaft?

You can put set screws on the hub. The shaft of the cim is threaded. A screw and a washer is a possibility.

If you are using the bearings in the motor to locate everything, You have a large overhung load on the motor. Bending the motor shaft is something to be concerned about.

[MrForbes]

We ordered a hub like that, and I expect that what we will do is to drill and tap it for a set screw (probably 10-32), and file a flat on the motor shaft. The screw would probably be opposite the key, possibly 90 degrees away from it...??? although it probably doesn't matter. I've seen some industrial pulleys with a set screw on the keyway, too.

We are probably going to use a chain drive so we can play with the speed of the shooter wheel. This lets us mount the wheel on a bolt, instead of having it supported by the motor itself. My guess is the motor bushings won't like having to support a large spinning wheel for a long time.

[DELurker]

Originally Posted by MrForbes

We are probably going to use a chain drive so we can play with the speed of the shooter wheel. This lets us mount the wheel on a bolt, instead of having it supported by the motor itself. My guess is the motor bushings won't like having to support a large spinning wheel for a long time.

I would second this. In our shooter design, we've moved the wheel off of the motor itself in order to provide a more stable mount for both. Besides, with the wheel on the motor, isn't is awkward to replace the motor if it fails?

Side note: We actually had started with the wheel on the hub on the motor shaft and mounted the motor to a plate using the front-side mounting holes so thoughtfully provided. It got interesting about 2 hours of testing later when one of those bolts backed out because of the vibrations ... Replacing that bolt required removing the wheel ...

[DonRotolo]

Originally Posted by DELurker

Besides, with the wheel on the motor, isn't is awkward to replace the motor if it fails?

Loosen the shaft coupler screws, pull off the wheel plus axle, replace the motor. Not very awkward, but I truly hope we never have to.