Quote Originally Posted by mitchejc View Post
I might stand corrected on this but there's normally a little circlip on the floating end of the screw that serves little purpose in my mind. If that is not used you do have a few mm to play with so rather err on the short side, the shaft will just sit a bit shallower in the floating bearing which I believe is not a problem.
Yes you are being corrected I'm afraid and the little circlip is very important. The floating end is just that floating so the bearing can be any where inside the block but the circlip stops the bearing falling off the shaft. And it does or will over time if you don't have the clip.

Wal

#1 Depends on your designing and drawing skills but me I always prefer to draw it accurately in Cad then have no surprises. This means I can safely order to size.

#2 At this short length then it won't be much of an issue but I'd keep it just long enough for my needs plus 2-3mm more. Normally I have mine machined to 30mm. BUT using the MBA12C I think you need standard machining other wise the coupler won't fit between motor and screw.? Thou like been said you can easily whip it off with cutting disc if required.

#3 Best thing to do with TBR20 is don't bother as they are rubbish.!! . . .There tends to be no accurecy to any of them whether that be the hole locations or the machining accurecy of the base.!
Again thou like been said if you must use them just drill your own holes.!