Poor man’s sanding ball (or cheap man’s sanding ball)
Here is a simpler way of making sanding balls without having to use that inflatable mandrel. I cut the pattern that same size as when I made the cover for the Guinevere inflatable sanding mandrel, but I just hold them on with an O ring this way. In the future. I’ll cut the flutes longer on the sandpaper covers for more material to hold onto.
I began by buying a rubber ball at a dime store here in town. Actually , I could not find a ball anywhere so I bought this old toy- paddle with a ball on as string and just used the ball. I cut it in half and made two sanders with it. I sanded the cut very smooth so it would have good surface contact and glued the half to a round piece of wood with a groove cut on the side and 1/8” hole in the end away from the glues surface.
I epoxied a 1/8 piece of steel in the one end so I can use it in my Dremel. The ball was too big in diameter so after it was mounted, I sanded it to shape (3/4” diameter) with a ball shape on the end.
Then I just centered the cover on the ball and rolled the O ring down over it and it works real good. I had to experiment with the groove location so the ends would not slip out of the O ring under pressure. Making the fingers longer should eliminate that .
Using this method, you can quickly make balls of any diameter for various jobs and just use regular cloth backed sand paper. You can also make mandrels of any diameter for collets in a Fordham, Wecheer, etc.
A word of caution, start with the Dremel on slow speed. I have a model 4000 and I cannot sand with it over 15 on the dial. I started on high and it turned into a fan right now!!
-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!!