TX200. Front piston bearing.
Posted 16 June 2010 - 03:27 PM
Given that the sizes are as follows (will be a bit of wear)
Piston seal = 25.16mm O/D
Front delrin ring = 24.7mm O/D
Comp tube bore = 25.06mm
The piston will be supported and run on the Piston seal which will leave the delrin ring clear of the bore.
Anyone know what AA's intentions were ?
Posted 16 June 2010 - 06:23 PM
Posted 16 June 2010 - 07:02 PM
I don't think that can be it as the ring just sits in a groove. It's strange as the groove has to be machined into the piston, the delrin ring made and then fitted. They could save a few quid by just leaving it out.
The pic shows the delrin ring behind the piston seal.
Posted 17 June 2010 - 03:50 AM
Edited by GBertolet, 17 June 2010 - 03:52 AM.
Posted 17 June 2010 - 08:01 AM
Note that acetal ring protrudes above piston diameter.
Posted 17 June 2010 - 06:50 PM
Posted 17 June 2010 - 08:40 PM
The rifle is cocked by the cocking lever first pushing rearwards on the rear of the comp tube. This would lift the comp tube up against the cylinder and either the comp tube or the rear delrin ring would bear along the cylinder wall. I'm guessing that it would be the comp tube rubbing against the cylinder as there is nothing to lift the rear of the piston. The second push would be against the piston seal, moving the piston rearwards until latched on the trigger sear. Unless the spring was seriously bent there should be a central alignment of the seal during cocking.
On the forward movement the seal is a parachute type and will take up it's maximum diameter which would be the bore of the comp tube. Given that the bore is 25.06mm and the delrin ring .36mm less I still don't see how it bears on anything.
Posted 20 June 2010 - 12:13 AM
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