Stepper motor shaft swap

[Shotgun]

I'm putting new steppers on a BP CNC mill. The new steppers have a shaft just over 1/2" (0.550"). The old one has 5/8" (0.625"). The new one has a 1.55" stick out, whereas the old one was 2.125"

Any idea on how one would go about making an adapter for this motor to fit the old pulleys?

 

[Inferno]

Make an adapter. 1" piece of stock. 2.125 long. Turn to 5/8 leaving a 3/8" collar at 1"
Drill .550 from the collar side 1.55 deep.
Add a set screw to the collar and another at 90 degrees.

Just a thought based on the info provided.

 

[woodchucker]

Pretty much the same as a motor to grinder arbor. https://www.mcmaster.com/products/motor-arbor-adapters/

 

[Shotgun]

Ya' see. That's why I hang out here.

I was thinking that the pulley needed to be physically over the new shaft. This adapter will move it out a little further, but that will actually work better, because I need to add an adapter to make the NEMA34 fit the mounting area of the old BP steppers.