I have slightly bevelled the edge but will probably cut it a couple of screwdriver blade sized slots. Need to strip down and old hard drive to see if it has any decent small magnets in it nextMake sure you leave a couple of mm of the disc showing on the edge so that you can pick it off easily when the magnets are fitted.Perhaps a small bevel right on the corner under the lip.
Nice project.
Ive got this 4pole 3ph Mitsubishi motor for just this purpose. Only 90w. I dug it out last night and Jerry rigged it up to a VFD with a pot. Data plate doesn’t give an RPM, a quick check shows 1500rpm
View attachment 268499
Not seen a motor like this before, very smooth and well balanced, doesnt budge on start up, or have the slightest vibration. Slowing it down to 300rpm and its still difficult to stop by hand. So I’m going direct drive.
Can you get the diamond discs in the UK, I don’t fancy ordering from outside