Hammermill attachment

[Donman]

I am thinking of making my hammermill an attachment to my Yanmar instead of using it as a stand alone unit. The unit is hard to horse around and bring to the locations I need to use it at. My thought was to fashon 3 point attachment points on the unit and hook it up to the pto which I can run at 1000 rpm. My biggest challenge is turning down the end of the shaft to 1 1/4 inch from 1 3/4 inch to accept my pto. One idea on how to do this was to use my angle grinder to rough it out close to diameter and then use a file or something to get it to finish specs. There is a pulley on the opposite side that could turn the shaft while working on it to keep it uniformly round. Any suggestions?

 

[mwb]

You will loose the keyway doing that; I would purchase an adapter.

Can you buy a new part for your PTO shaft u-joint (half of the universal joint) that will make it the right diameter?

 

[srjones]

Sounds like something I'd do...If I had a hammer mill.

You could do the grinder thing, but it would go best if you do two things.

1. Figure out a way to slowly drive the mill from the top side.
2. Make a jig to hold the grinder.

You'd lose the keyway, but that wouldn't matter if you were able to drill a hole for the sheer pin.

Before you start, do you have the correct rotation? (same rotation as your PTO) Or does it matter?

Also, taking 1/2" of material is quite a lot. Couldn't you find a drive yolk with a 1 3/4" bore? You'd still need to drill a hole for the sheer pin.

You could also take the part out and take it to a machinist, but I think it would be cheaper to but a new pto yoke.