Piston gliding

[norris]

Gliding was popularised (pioneered?) by Venom and other 80s airgun tuning houses. At the time, most of their work was on HWs, hence the association between HWs and gliding.

You can button, glide or otherwise support both ends of most pistons, but it’s a lot easier to do well on actions with a central piston rod (HW, AA TX, etc) than those that engage the sear at the bottom.

Can it be done to those that engage the sear at the bottom?

Will Delrin/nylon buttons eventually leave wear marks on the cylinder?

[Geezer]

Can it be done to those that engage the sear at the bottom?

Will Delrin/nylon buttons eventually leave wear marks on the cylinder?

Yes, I think so.

No. Probably.

[evert]

Pistons where the sear engages the skirt need to be harder than the pistons with lathing rods, so they will often be harder to machine for synthetic buttons.
Glue on buttons can be used, but for example BSA supersport/lightning/superstar pistons leve very little room for glue on buttons as they are a quite close fit in the cylinder.

[norris]

Pistons where the sear engages the skirt need to be harder than the pistons with lathing rods, so they will often be harder to machine for synthetic buttons.
Glue on buttons can be used, but for example BSA supersport/lightning/superstar pistons leve very little room for glue on buttons as they are a quite close fit in the cylinder.

I have discovered that, also Hatsans and Webleys.

[Mr. Gen]

Can it be done to those that engage the sear at the bottom?

Will Delrin/nylon buttons eventually leave wear marks on the cylinder?

Plastic wont abrade steel - it is the basic principle of synthetic bearings.

[norris]

Plastic wont abrade steel - it is the basic principle of synthetic bearings.

Strange that as I have seen and repaired shafts that have nylon rollers on them!
Might had been atmospheric dust or moisture that caused the wear to the steel shafts?
Often thought about using Nylatron (containing lubricant) instead of Delrin.
Delrin (POM/Acetal) and Nylatron (Nylon) are trade names.