delrin stud or o ring ptfe

[loiner1965]

which is best,,,,shall i stud the piston or use the ptfe o ring like the tx piston....which will give me the least resistance

[jefL]

Logic says that buttons will give least resistance, you only have three point contacts compared with a complete circle for the o-ring.

But I am prepared to be contradicted by what has been found in practice, a bucketload of theory aint worth squat if it don't work.

[Shed tuner]

The ring is easier to do though

[Gibbon]

How about an O- ring with several wide slots cut into it |_| |_| |_|

Wouldn't that reduce the friction more than a "full" O-ring ?

[jefL]

How about an O- ring with several wide slots cut into it

Interesting thought, it wouldn't work with a flexible o-ring of course but in this case I assume we are talking of rigid ptfe of roughly the same hardness as delrin, so it might well work, at least I can't see why not. Plenty of room for experiment here methinks, now where can I get some large diameter ptfe.

Nice bit of lateral thinking Gibbon.

[loiner1965]

Interesting thought, it wouldn't work with a flexible o-ring of course but in this case I assume we are talking of rigid ptfe of roughly the same hardness as delrin, so it might well work, at least I can't see why not. Plenty of room for experiment here methinks, now where can I get some large diameter ptfe.

Nice bit of lateral thinking Gibbon.

going to make a lazaglide type piston for the 77 with a delrin/ptfe ring similiar to tx200 to run outside the chamber.....will use original piston but separate it and make a new sleeve with the tx flange on......