View Full Version : NEMA23 mount for BK12

24-04-2017, 11:03 AM
I was wondering what people have been using as a NEMA23 mount to use with the BK12/BF12 bearing blocks.

One option is the ready made MBA12-C that accepts an FK12 for the fixed side.


Has anyone come up with an alternative of their own? The NEMA23 centerline is at 28.2mm, the BK12/BF12 axis is at 25mm. Therefore all that is needed is a way for the motor to sit 3.2mm below the plane on which the BK12/BF12 are fixed.

24-04-2017, 11:31 AM
Just to be clear, this mostly applies to a custom Z axis.

X & Y will usually have their own end plates in place where a motor can be mounted appropriately.

07-05-2017, 03:07 PM
When my ballscrews come I'll tell you lol ;)

I bought these

and need to mount it to this style mounting bracket

according to the drawings there is a 14mm difference between the centre of my nema 23 mount and the centre of the BK12/BF12 bearing blocks.

Luckily I found a piece of scrap tool aluminium that's been milled flat to 14mm from a commercial printer so I intend to cut it down to make "spacers" for the bearing blocks from solid tool aluminium which should align perfectly.

I might have enough spare pieces to make a few spacers if you're stuck send us a PM.