On 1/6/20 2:35 PM, Jim Anderson wrote:
-----Original Message-----
yes, i have. I scavenged some raw material from another newer
ribbon. It was a bit messy but doable.
I bet. :( I'm OK with the mess, I'm just concerned about whether I will be
able to cut a sufficiently round cylinder of foam that it will rotate without
getting stuck on a flat spot.
I guess the only way to know is to take a stab at it. Sigh.
Do that with simple punches made from pipe.
Take a piece of pipe (any kind, even pvc, since you're just cutting soft
sponge) where the ID of the pipe is the same as the ID you need for the
sponge, and another where the ID of the pipe is the same as the OD you
need for the sponge.
Cut both pipes at least a few inches long, like 3 at least, and make the
outside pipe longer than the inside pipe.
Sharpen one end of each pipe by just filing/sanding/grinding the outside
lip and an angle.
Wrap masking tape around the inside pipe about 3/4 inch from the sharp
end, until it forms a disc that's almost as big as the inside of the
outside pipe. Make another tape disk the same way but close to the other
end of the small pipe.
Use the small pipe to punch the inside hole in the sponge with a hammer.
Leave the small pipe in the sponge. Slip the big pipe over the tape
spacers. Punch the outside diameter of the sponge.
Now you have a roller where the outside is perfectly round, and the
center hole is exactly centered relative to the outside.
--
bkw
