Hello,

I just received my Harmonic Drive CSF-25-50 that I'm intent to use for the 4th axis. Good thing with this type of HD is that it comes with a nice cross roller output bearing which allows easier mounting for the chuck. This is all I have at the moment. I mean I haven't done a design yet but I think I'll use a block of gray cast iron as housing. And I'll probably use the smallest size of Nema34 or biggest size of Nema23. I'll appreciate your recommendations on this.

The 25 size may be just a little oversize for a BF20 mill, but I don't know that yet too.

Anyway. Thanks.