Making a ball mill from a sewing machine motor, a broom stick and some scrap wood. there doesn't seem to be any proper ball mill instructables on the site, all drill based temporary solutions, so I figured there needed to be one.
I'm using 18mm MDF as that's what I had laying around
1 x dimmer switch
1 x sewing machine motor
1 x old computer cable
2 x connector blocks
and a bunch of screws
Step 1: rollers
so I cut some broom stick to 30cm long each and drilled a pilot hole in the middle at each end then put a screw in each end and cut the head off leaving about 1cm of screw poking out, this will be the axel for the rollers.
If I had of thought about it a bit more I should have used round nails but hey too late now.
On one roller I need to form a indent for the drive band of the sewing machine motor to sit, this will stop it moving up and down the roller. to do this I used my drill as a make shift lathe, and just pleased a round file on the stick until the groove was at the right depth.