4' x 4' x 8" Router Build

[JonnyFive]

I'm trying to finalise the ball screw design and noticed that the standard dimensions from BST don't seem to be compatible with the FK15A bearings - looks like the spacers eaither side of the bearing are too long and there's not enough length to get the locknut on the end:



Am I missing something? Do I have to turn down the spacers? I'm planning on tweaking the end to have 2 locknuts rather than using the grubscrew, just want to make sure I'm doing it correctly.

Cheers,

[Clive S]

I'm trying to finalise the ball screw design and noticed that the standard dimensions from BST don't seem to be compatible with the FK15A bearings - looks like the spacers eaither side of the bearing are too long and there's not enough length to get the locknut on the end:



Am I missing something? Do I have to turn down the spacers? I'm planning on tweaking the end to have 2 locknuts rather than using the grubscrew, just want to make sure I'm doing it correctly.

Cheers,

Have you purchased the ball screw and bearing FK15A from Fred if so he should have machined it to match the bearing.

Also did you tell him the "F" length you wanted it is normally 15mm as standard but I usually tell him to make it 30mm so as to get more space for a pully.

I am not familiar with that bearing.