Well the design progresses slowly...

Been thinking about ways to mount my leadscrews and looking at bearings for the same, namely the 608ZZ that Lee sells...

I have some questions...

1/ Do I really need bearings for 10mm leadscrews max length 400mm. I've not done the calcs yet but gut feel says yes even if its just for the far end....

2/ whats the diameter of the inner rotating part of the race (not the shaft diameter)? My thought is to use a similarly sized OD/8mm ID washer that would act on that to preload the leadscrew with an 8mm ID thrust collar. How do others suggest preloading the screw or do you rely on the motor to control horizontal movement of the screw?

3/ Was thinking about boring out an SK12 or SK13 round rail mount to fit the OD of these races, since that would put the screw centreline at the same height as the rail centre line and is easier than constructing somehting from scratch IMHO. Do you see any issues in doing so? Else what do people suggest as a way to mount the races?

I'll have to machine the ends of the leadscrew down to 8mm (they are 10mm x 2). The leadscrew i have is 400mm long which with machining allowances will work with a 230mm table on 500mm rails giving of 460mm of travel (20mm anti-crash space!).

Not having seen how others do this close up, this is my best guess as to how to approach it. Thoughts?