Modified Precision Piezo Orion Bottom Mount

by ajcraig Sep 26, 2018
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For anyone interested in making this, and looking for alternative sources for the o-rings, here's what I found on decoding what the 40A-L means, and some sources I found.

  • 40A refers to a Shore A hardness rating of 40, which is a medium squishy-ness. I did see 50A o-rings listed in some places, but most of those were the wrong thickness (1.5mm vs 2mm)

  • The "L" refers to the thickness - in this case 2mm thick. WASD also sells 4mm thick versions that are labeled 40A-R. Most sources I was able to find color the 2mm rings red and the 4mm rings blue, but this isn't always the case. For example, one of the cheapest US vendors on Amazon (ThreeBulls) actually seems to sell the same size rings in black, blue, red, and clear. Unfortunately, they don't list the hardness rating although I may go ahead and try them since the exact hardness rating probably isn't important.

Good info chillimangoes, the shore hardness is not super critical for this to work, 30-55 should work fine provided pre-compression on them is consistent. The thickness is more important but 1.5mm o-rings could work with a small adjustment to the model.

It's really just a way to add controllable compression to the mount whereas the original design relied far too much on precise control of clamping force and friction.

Actually, ignore what I said about the ThreeBulls vendor on Amazon. I misread the listing. It turns out their o-rings are specified as 1.5mm thick.

Thanks, this is really helpful! This, coupled with a sturdy mount has made my piezo a lot more reliable.