Keling 381oz-in Motor shaft length

[neity]

Hey guys. I have a micromark mini mill with ballscrews installed on all axis, and, especially on my X and Z, i have to torque down the motor into the love joy connector a good 1/2" or so Into the rubber spacer thing. It is VERY tight. Is this normal? Should I cut down my shaft? The only other thing I can think of is to drill a hole through the rubber spacer in between the love joy connectors?

Thank you in advance!

Very frustrating once I get everything mounted and wired up correctly and seem to have issues! My Y starts to wobble.

[doorknob]

I'm not sure that I completely understand your question.

Are you using the CNCFusion conversion kit? If so, are you saying that you think that the dimensions of the motor mounts supplied by CNCFusion force the motor shaft too deep into the Lovejoy couplings? If that is the case, perhaps it is necessary to put some shims between each motor face and its motor mount to move the shaft back a bit (or else, as you have suggested, you could cut the shaft end).

I have been considering getting that kit, and I have a set of Keling 381 oz-in. motors, but I was thinking of getting some Oldham couplings from McMaster Carr to use instead of the Lovejoys. But since I haven't actually installed the kit, I can't answer your question based on first-hand experience.

However maybe I am misunderstanding the problem that you have encountered.

[neity]

I'm not sure that I completely understand your question.

Are you using the CNCFusion conversion kit? If so, are you saying that you think that the dimensions of the motor mounts supplied by CNCFusion force the motor shaft too deep into the Lovejoy couplings? If that is the case, perhaps it is necessary to put some shims between each motor face and its motor mount to move the shaft back a bit (or else, as you have suggested, you could cut the shaft end).

I have been considering getting that kit, and I have a set of Keling 381 oz-in. motors, but I was thinking of getting some Oldham couplings from McMaster Carr to use instead of the Lovejoys. But since I haven't actually installed the kit, I can't answer your question based on first-hand experience.

However maybe I am misunderstanding the problem that you have encountered.

No I believe you got it. The shaft seems to long. I don't want to shim the motor back off the mount, however. The mounts have circular cutouts for the trim around the shaft where they slide in real nice. The only Thing I can think of, and don't really want to do, is cut the shafts, so if anyone else out there has experience with this it would be greatly appreciated.

Thank you!

[H500]

The shafts must not be forced against the rubber part. Otherwise, you will increase rather than decrease the stress on the motor. You could drill a hole in the rubber part, but make sure the diameter is large enough such that the shaft never touch it.

Is there room to slide the coupling away from the motor?

[neity]

The shafts must not be forced against the rubber part. Otherwise, you will increase rather than decrease the stress on the motor. You could drill a hole in the rubber part, but make sure the diameter is large enough such that the shaft never touch it.

Is there room to slide the coupling away from the motor?

Yes seems like the best bet is to drill a hole in the rubber spacer love-joy thing.

Room to slide the coupling away from the motor...Well When I put the couplings on at first I put the end of the shaft flush with the internal surface of the coupling, so yes it could be pushed off a little bit further (half a coupling length...before it would be passed the set screw).

I will drill out the rubber spacers. I am a little confused as to why it would be bad if the shaft touched the inside of the rubber coupling, unless that is to go along with less stress on the shaft is better.

Did I harm my motors at all by pushing the shaft so hard up into the motor at all?

[neity]

Is there anybody else who either had to cut down their motor shafts or cut holes through the rubber part of the love joy connector?

[neity]

I can't believe I'm the ONLY person that had this issue with shaft length with the standard ballscrew kits from cncfusion and the G540 motor pack from keling....uhm no jokes intended!

[H500]

I will drill out the rubber spacers. I am a little confused as to why it would be bad if the shaft touched the inside of the rubber coupling, unless that is to go along with less stress on the shaft is better.

Did I harm my motors at all by pushing the shaft so hard up into the motor at all?

If the hole was too small, the coupling would not be able to flex as easily. That would force the motor shaft and bearings to take the load. That would defeat the purpose of the coupling.