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• Piston specs
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  Someone emailed to ask about the exact piston I used. Here's my reply:
  The piston I used has this marking on it:
  1.06DXPSR0.75 CV
  
  I can't find it online anymore (Parker has updated their website recently and they've got a lot of broken links) but here is what it all means:
  1.06" bore
  DXP Pivot and nose mount, double acting, no pivot pin
  SR Stainless steel rods
  0.75" Stroke
  
  This website helped me get some of the data:
  http://interchange2ph.com/index.php
  
  This site will let you get CAD drawings for the part:
  http://oem.cadregister.com/asp/PPOW_Entry.asp?company=38834&elementID=73326589/AIR/SR

  Posted by johnedgarpark on February 10, 2008 at 09:37:07 Pacific Time

• Piston specs
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  I dig this project, and will probably build one at some point. No need to chase the Parker actuator--based on your specs, McMaster-Carr PN 6498K445 is similar if not identical. These are air cylinders, not fluid hydraulic, but glycerin should be harmless enough if it doesn't leak down past the piston.
  
  Also, some math would be required to figure out what the gage pressure should read to exert 30 pounds of pressure at the face of the tamper. On that note, an expression of optimum tamping pressure in psi would make more sense than force in pounds as it removes any dependence on the size of the tamper itself.

  Posted by bgoshert on August 22, 2011 at 21:16:04 Pacific Time

• Piston specs
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  Thanks for the info on the McMaster cylinder. You mentioned doing the math to figure the pressure at the tamper face -- my method was to push down on a scale with the piston, gauge, and tamper connected. Since the gauge and scale agreed I figured that was that. Is there more to the story? Let us know if you build one!

  Posted by johnedgarpark on August 28, 2011 at 08:03:20 Pacific Time