carving rebound rubbers?

[cait001]

An EM rebound rubber has the thickness and bounciness I need for a few applications, but it's the wrong shape. I've tried carving them before, but with poor results.
Anyone have tips on how to slice and reshape rebound rubbers for other replacements?

[Mrhide]

What applications?
Floor mat foam is very easy to work with

[cait001]

The first rubbers I need to replace are for my smartball machines. I'm only now realizing a rebound rubber might be too short.
For the smartball games I need a 20mm tall rubber with a 18-19mm diameter. Any idea what I could use there?

(rebound rubber on left, the original smartball rebound rubber on right)

The other use I was thinking was pachinko rebound rubbers. The inner thickness of the rebound rubber is the proper size to "punch out" rebound rubbers, but I have no idea how to carve them properly. I tried with this one, but it was really difficult to saw it with an exacto blade, and gave up trying to even bother shaping it.

[cap]

would a coping saw work for this?

[mrmikeman]

Probably a bit too thick for an inexpensive laser cutter.

3/4" hole saw? Remove the drill bit from the center and just use the saw. Drill press will keep it straight. 3/4" = 19mm

[cait001]

I have to confess I do not know about the saws that both of you mention.

And does anyone have an idea of a rubber that could work for replacing the smartball one? 20mm tall is taller than a rebound rubber... (needs to also be 19mm diameter circle)

[semicolin]

Sharpened piece of EMT and a hydraulic press. You want to punch this, not tear or cut it.

[cait001]

I guess next I should ask if anyone knows where I can just custom-order rubbers like that of specific dimensions?

[semicolin]

You can 3d print different rubbers: https://all3dp.com/2/3d-print-rubber-is ... -possible/

Honestly though a crank vise, a new rebound rubber, and a piece of thin-walled EMT filed to sharpness is gonig to be fine. I have 3/4" EMT. Give me a fresh rebound rubber and I'l destroy it for you.