when i was trying to make my ring (chek it out if you haven't seen that instructable yet :D) i had to do a lot of work by making rhe ring flat and soft. i was playing around with a small motor and burned my finger because i touched the moving part of it. the idea was born... what if i glue some sanding paper to it?
the result was better than i hoped :)
Step 1: Finding Materials
you will need:
-a power source (9 or 12 v is enough for some kind of metal and for wood)
-something to cut with
Step 2: Making the Upper Part
cut out a piece of sanding paper just big enough so you can stuck it around the motor.
Step 3: All the Sand Came Of? What Now?
leave the old piece on it and just place another one (bigger than the previous piece) on top it. you can repeat that till you think it gets too bick and then you remove the old piece and replace it for a new one
Step 4: Putting Things Together
i use a 9v or 4 3V powersources. i prefer te 3 volt because it has more power, but the 9 v fits perfectly into the motor so it is easier to hold
Step 5: :)
good luck with building it and if you liked this instructable please chek out my other instructables :) leave a comment if you have any points of improvement or questions :)