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gruntguru, it looks like a flex disc coupling would be good if we had an angular misalignment. Our problem seems to be a parallel misalignment.

BrianPeterson, we have looked at some flexible couplings but haven't found any that are good for 8000 RPM.

We sent out three parts, one prototype and two production. I compared the prototype and the worse of the two production and as close as I can get is the .005 based on the holes for the alignment pins.

"This would not ensure the best shaft alignment, since it is only based on "feel" of loose parts and not on shaft alignment measurements." My feelings exactly.

The actual variance is probably less than that. Thee coupler is provided by the motor manufacturer and you can feel a slight amount of backlash - which they say is OK -. Their solution is to assemble the motor, adapter and coupler with the shaft facing up the place the gearbox onto the...

Hi, I work with the OP and have been involved in this project. In reviewing all the data we have collected I am left with the question of just how much tolerance there is in the alignment of the two shafts? We sent a prototype (that has performed well in the field) and two production adapter...