Glad to hear you are well compensated - as well you should be!
. Actually, I helped out with a forum for a bit - a thankless job, so please know that I am indeed VERY thankful!
My only concern with this rigid coupler is of course any radial alignment issues that would not be compensated for. I know I shouldn't have it to begin with - but I did have some slight irregularities with the work done at the water-jetting place.
I may be able to tweak the motor alignment to ensure a perfect fit. Then I wouldn't really be too concerned. Especially since I realized that while pretty nifty, Oldham style couplers do not offer any axial support. I suppose that's only an issue when the motors are powered off. I'll
Check what kind of play I have, as you suggested.
Any higher quality flex coupler (Bellows) is ridiculously priced. At that rate - cheaper to risk it and replace the damn motor if something wears
The motor shaft has a flat already - and I will try to file a small flat only the ballscrew end as well.
Now that I've got that sorted, time to get back to the list!