Specialists > Audiologists
Tonearm pod design?
rollo:
Mass from the lead base is a VG idea. So we have a dead solid lead base and need to attach a wood plinth for securing arm. To take advantage of base I would suggest gluing the wood to lead or add a piece of cork or rubber in between.
charles
S Clark:
Charles, there has been lots of arguments on line about the merits of an independent pod vs. attaching an arm to a plinth. I was planning on a naked Victor TT81 table without plinth for this pod. Is there a particular reason you advise attaching the pod to a plinth? I sorta like the ability to move a pod from table to table. Any suggestions for adjustable feet? It's now resting on 3" of maple cutting board, with the TT on three wine corks, and a temporary mesquite pod on trimmed to height and upright cork. Had to drink a lot of wine, but we all make sacrifices for our hobby.
P.I.:
Heresy at foot. Read on >>>>>>>
Silicon is a high hysteresis material that stores energy. Case in point; a million years ago when the world was young I used to fly control line racing model airplanes. One of the events was called Fast Rat Race. Tim Gilott from CA designed an airplane ( the Shark Rat:https://www.airagestore.com/planes/plans/control-line/gillot-shark.html) that was way out of the box for that period. These were model airplanes that were capable of 140+mph flown on 2 - 60' music wires and 3 pilots to a circle. Scary event, but way fun! I didn't fly them. I built them and was the pit guy. My pilot told me that those speed were f*****g evil, so we went to FAI Tem Race. Yet another story for people that flew control line model airplanes.
Tim's designs were bleeding edge and so the local contingent built 4 of them. 2 guys went with Tim's advice of using Mortite caulk to bed the fuel tank into the Harter speed magnesium pan the motor was mounted in. These airplanes were scary fast. A couple of builders decided Tim was stupid and used silicone to bed the tanks into the speed pans. They would accelerate from the pit stop, make a half a lap, foam the fuel and the motors would quit. These guys bitched about how bad the design was to no end. When we finally convinced them to use Mortite, the engine runs became consistent from launch to the pit stops. Tim, being the ultimate competitor listed silicon. He admitted to us later that he didn't use silicon, but Mortite, too. Yes, he was a 'rat', but a great guy. He just wanted to win!
It was then that I determined that silicon was vibration's friend.
I do not use silicone for anything except for sealing glass.
YMMV...
rollo:
--- Quote from: S Clark on December 03, 2018, 12:59:46 PM ---Charles, there has been lots of arguments on line about the merits of an independent pod vs. attaching an arm to a plinth. I was planning on a naked Victor TT81 table without plinth for this pod. Is there a particular reason you advise attaching the pod to a plinth? I sorta like the ability to move a pod from table to table. Any suggestions for adjustable feet? It's now resting on 3" of maple cutting board, with the TT on three wine corks, and a temporary mesquite pod on trimmed to height and upright cork. Had to drink a lot of wine, but we all make sacrifices for our hobby.
--- End quote ---
The plinth I meant is a piece of wood atop the lead. I would isolate lead mass with brass cones [ Mapleshade ,small ]. Wine is good.
charles
BobM:
Even very small micro vibrations, or micro movements, are bad for a tonearm mount. Having a separate pod sounds like a good idea initially since you can adjust easier, but it better be damned heavy so it will not move, not an iota. That's why so many designers attach the tonearm directly to the plinth, it eliminates any idea of separate movement between the tonearm and the record surface.
Same idea against putting any kind of squishy material between the tonearm itself and its mount. Keep the squishy stuff for below the turntable, between it and the stand it sits on.
Now putting something vibration absorbing under the motor pod, if it sits in a separate pod, is probably a better idea. That might take some of the vibration it produces and isolate it from the table top everything sits on.
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