Gents,

can someone suggest a way of fixing an off-the-shelf conical shaped grinding part on the end of a shaft without using a key or cutting / machining the part? The part has a hole running through it, has no keyway, or any other holes to attach it to the shaft. The shaft will be machined from scratch, so anything can be done with it to make it accept the part and hold it in place. Forces acting on the part / shaft will be minimal as it will grind soft, crunchy material. Here's a sketch:



The internal hole in the off the shelf part is 13mm at the top and 13.3mm at the bottom, I think normally it's mounted on a short 13.3mm dia shaft, with the shaft coming through the bottom and a bolt pushing the part all the way from the top. This means the part gets locked in the upper via press fit. My design has the shaft coming in from the other side, so that way of locking it is out the window.

Any suggestions are more than welcome.

Cheers,
dsc.