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Post by rexton on Apr 18, 2022 19:02:26 GMT
Do any of you have any alternative suggestions for viscoelastics instead of Sorbothane? I'm making some CLD shelves and would welcome any help.
Andy
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Post by stevew on Apr 18, 2022 20:22:45 GMT
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Post by rexton on Apr 18, 2022 20:38:10 GMT
Thanks but its not what I'm looking for. I'm looking for sheets of viscoelastic material which can be used in CLD shelves as an alternative to Sorbothane. |
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Post by sq225917 on Apr 18, 2022 21:12:50 GMT
How big are the sheets to be, how heavy are the shelves, what is the supported weight, what frequency and amplitude of vibration are you trying to mitigate?
Without these it's a crap shoot
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Post by electronumpty on Apr 19, 2022 7:17:30 GMT
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Post by rexton on Apr 19, 2022 18:44:50 GMT
How big are the sheets to be, how heavy are the shelves, what is the supported weight, what frequency and amplitude of vibration are you trying to mitigate? Without these it's a crap shoot 1. The sheets would have been x2 5mm thickness 55cm x 45cm of bamboo with 1mm sorbothane stuck on with thin spray/strong double sided tape to bond them 2. The weight supported would have been variable from 15kg upto 35kg, basically, a turntable, x2 racks for paradise phonostage, a croft preamp <7kg and a 35kg power amp. 3. Frequency and amplitude - mainly transformer vibration from the valve amp, small Tx vibration from the croft preamp, I would assume the paradise emits virtually bugger all
vibration and finallt the Garrard 301 motor. So I would have to work out each individually for amplitude & vibration.
4. I'm trying to mitigate vibration getting to the garrard.
Seems that sorbothane has a damping factor of 0.2, same as bamboo, so does mean putting them together would produce a damp factor of 0.2 or do they work better when put together. If this is the case then I may as well just make bamboo shelf racks, or better stil save up and gets a couple of sheets of permali/panzerholz and make the shelf racks from that with a damp factor of 0.6 ( I think).
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Post by sq225917 on Apr 20, 2022 18:57:40 GMT
The damping factor of dorbothane, all rubber depends on the shore hardness, thickness and load it's under. Thicker and less load equals higher damping at lower frequencies. Thinner and higher load decreases the max damping and raises the FR at which it becomes transmission.
It's a mine field.
Proper cld uses a very thin, shear, layer between two surfaces, one not in contact with anything else.
What your planning isn't cld, but it'll work still
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Post by rexton on Apr 20, 2022 19:05:51 GMT
Yes the more I look into this I'm thinking just Panzerholz and bugger the rest.
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