[InventIt]

I was amazed how well the top bearing fit between the bore and the shaft!!! It dropped in with a tight slip fit. This was one thing I wasn't sure was going to work out. Maybe I just got lucky?

Because of the way I machined this I was afraid the bore may not be concentric with the shaft/ front bore because I bored the two ends of the spindle housing in two different setups on the lathe. So I guess I must have done a good job positioning the housing for the top bore.

This top bearing (30mm x 62mm plain ABEC1 ball bearing) will support the driven end of the shaft and add rigidity to the assembly.

The ER collet extension has a threaded hole in the top of the shaft. I will use this to connect a pulley to the shaft as well as clamp the top bearing to the shaft with a bolt. I'll use the PC router to drive the ER collet spindle. I am thinking 3:1 ratio should be good. So if min/max speed of the PC is 10000 to 23000 then the spindle should turn 3300 to 7600rpm.