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How to cut sorbothane?

I recently read a glowing review of Herbie's Big Fat Discs, which are 5/16" thick by 1 5/16" diameter sorbothane discs. So, I did some research and I found a huge variety of sorbothane sheets available at McMaster-Carr. I bought a 12"x12" by 1/4" sheet of 40 durometer sorbothane for $29.

Does anyone have a clever and easy method for cutting discs out of this sheet other than scissors? I was thinking of a sharpened cookie cutter type thing as a tool which could be hammered down on the sorbothane, effectively cuttting a disc...

BTW, I can get 8 discs out of this $29 12"x12" sheet (with useful scrap left over), and 8 Herbie's Big Fat Discs would cost just under $90.
tvad
newbee
4,093 posts
 
Tvad, I know you know this but just in case..........

Sorbothane can destroy furniture finishes. Unfortunately I can prove it! :-(

Best to put some waxed paper between the wood and the sorbothane.
tvad OP
9,467 posts
 
Thanks for the tip, Newbee. I did not know that. It won't be an issue on the loudspeakers, but it would be an issue if I tried it on a component.
stilljd
151 posts
 
Oh my gosh. I forgot to add what Newbee pointed out. A lot of thermoset polyurethanes outgas forever and will leach out oils and plasticizers. They also react with a certain classes of thermoplastics in a very unpleasent way (melt the thermoplastic). They can also stain your carpet. Cut a polyethylene (ziplock) bag in a slightly larger diameter to place underneath the pucks. Shouldn't be any reaction. Sorry!
tvad OP
9,467 posts
 
Well, I received the 40 durometer sorbothane and looked again at my
VR4 cabinets...and voila...the top cabinet is essentially supported by four
small sorbothane footers. I had remembered them as being harder
rubber. Since the sorbothane I purchased is the same height as the VR4
footers, I'm going to bag that idea unless I decide to return what I
purchased for a thicker piece. In the meantime, I'm using the
12"x12" sorbothane sheet under my Paradisea DAC.

As for cutting the sorbothane, I've been watching arch punches on E-Bay
for nearly three weeks. I've lost a couple of auctions. At this point, I
believe I can likely cut the 5/16" thick sorbothane with a pair of
scissors.
tvad OP
9,467 posts
 
Finally purchased a 1 1/2" arch punch on E-Bay. Hopefully, this will work to cut the 5/8" sorbothane sheet.

I'll have a few more discs than I require. If you might be interested in some, send me an email. They won't be free, but they'll be a lot less expensive than if purchased through an audio dealer.
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