Materials for a bearing button

[mobilehomer]

The Crosman NP2 has a buttoned piston. It uses 3 - 4mm Teflon balls in pockets.  I replaced them with Delrin balls.

Teflon is WAY too soft for that in my opinion.   They were BALLS? Not posts or buttons or anything? Teflon balls would seem like they would fall apart in no time

Oops! Brain fart. I meant Nylon. Still too soft. The Delrin wears much better. Yes, balls in pockets.

[antithesis]

The Crosman NP2 has a buttoned piston. It uses 3 - 4mm Teflon balls in pockets.  I replaced them with Delrin balls.

Teflon is WAY too soft for that in my opinion.   They were BALLS? Not posts or buttons or anything? Teflon balls would seem like they would fall apart in no time

Oops! Brain fart. I meant Nylon. Still too soft. The Delrin wears much better. Yes, balls in pockets.

Lol balls in pockets😂

I just so happen to have bought some 3/32 nylon balls from a tattoo supply house.. while I like the idea, a rolling ball would require a lot more tedious work and even in this application I think delrin would be better for a ball...or maybe torlon? I have some 6mm torlon transmission check balls I got to replace the &^^& one in my China pump.  I never pl played with torlon before so I'm not sure how it does as a bearing, but it's tough stuff I know that much

[mobilehomer]

The Crosman NP2 has a buttoned piston. It uses 3 - 4mm Teflon balls in pockets.  I replaced them with Delrin balls.

Teflon is WAY too soft for that in my opinion.   They were BALLS? Not posts or buttons or anything? Teflon balls would seem like they would fall apart in no time

Oops! Brain fart. I meant Nylon. Still too soft. The Delrin wears much better. Yes, balls in pockets.

Lol balls in pockets😂

I just so happen to have bought some 3/32 nylon balls from a tattoo supply house.. while I like the idea, a rolling ball would require a lot more tedious work and even in this application I think delrin would be better for a ball...or maybe torlon? I have some 6mm torlon transmission check balls I got to replace the &^^& one in my China pump.  I never pl played with torlon before so I'm not sure how it does as a bearing, but it's tough stuff I know that much

To be clear, the balls do NOT roll. The pocket just locates them.

[antithesis]

The Crosman NP2 has a buttoned piston. It uses 3 - 4mm Teflon balls in pockets.  I replaced them with Delrin balls.

Teflon is WAY too soft for that in my opinion.   They were BALLS? Not posts or buttons or anything? Teflon balls would seem like they would fall apart in no time

Oops! Brain fart. I meant Nylon. Still too soft. The Delrin wears much better. Yes, balls in pockets.

Lol balls in pockets

I just so happen to have bought some 3/32 nylon balls from a tattoo supply house.. while I like the idea, a rolling ball would require a lot more tedious work and even in this application I think delrin would be better for a ball...or maybe torlon? I have some 6mm torlon transmission check balls I got to replace the &^^& one in my China pump.  I never pl played with torlon before so I'm not sure how it does as a bearing, but it's tough stuff I know that much

To be clear, the balls do NOT roll. The pocket just locates them.

Well, if they aren't glued in I think SOME rolling is possible. I know there is nothing practical about the idea, but if I had my way I'd make a pocket, a cupped guide of Teflon inside, with a harder rolling element on top of that.

But if anything I'll probably cut a cylindrical button set in a pocket and maybe profile the protruding area to be conical to minimize contact area, and in that case the harder the polymer the better, I wonder what kinds of filled peek is available.

Now I'm stuck on the idea of the bottom strip and sear engagement area, the zip tie idea. I might give peek or polyethylene a try on that, many skid plates are uhmw, or heck even pex tubing cut into narrow strips...but then the zip tie is such a simple solution and easily replaced

[KnifeMaker]

I'm afraid the cotton Phenolic will not work. I have a LOT of it on hand. I made a LOT of knife handles from it.


It was first introduced as Micarta. A product of Westinghouse or GE. Don't remember.


It is not slippery, in fact when it becomes wet, it is quite grippy. Far too abrasive to be used as a bearing material. 


Here  a pic of it in the well known to the Knife World Green Micarta.. Knife by my old friend, RIP, Bob Loveless.   


It is a much finer grade made with Linnen rather than cotton which is also known as Canvas Micarta.


Knife
 

[mobilehomer]

The Crosman NP2 has a buttoned piston. It uses 3 - 4mm Teflon balls in pockets.  I replaced them with Delrin balls.

Teflon is WAY too soft for that in my opinion.   They were BALLS? Not posts or buttons or anything? Teflon balls would seem like they would fall apart in no time

Oops! Brain fart. I meant Nylon. Still too soft. The Delrin wears much better. Yes, balls in pockets.

Lol balls in pockets

I just so happen to have bought some 3/32 nylon balls from a tattoo supply house.. while I like the idea, a rolling ball would require a lot more tedious work and even in this application I think delrin would be better for a ball...or maybe torlon? I have some 6mm torlon transmission check balls I got to replace the &^^& one in my China pump.  I never pl played with torlon before so I'm not sure how it does as a bearing, but it's tough stuff I know that much

To be clear, the balls do NOT roll. The pocket just locates them.

Well, if they aren't glued in I think SOME rolling is possible. I know there is nothing practical about the idea, but if I had my way I'd make a pocket, a cupped guide of Teflon inside, with a harder rolling element on top of that.

But if anything I'll probably cut a cylindrical button set in a pocket and maybe profile the protruding area to be conical to minimize contact area, and in that case the harder the polymer the better, I wonder what kinds of filled peek is available.

Now I'm stuck on the idea of the bottom strip and sear engagement area, the zip tie idea. I might give peek or polyethylene a try on that, many skid plates are uhmw, or heck even pex tubing cut into narrow strips...but then the zip tie is such a simple solution and easily replaced

Nope, not glued in. A light press fit. No rolling.

[int3man]

I had galling on a Prod Hammer.  There was a tapped hole in the top on the hammer.  So I screwed a Nylon bolt into the hole and spun it in the lathe and left it .030 fat.  Worked great.  Reduced cocking force and stopped the galling, also stopped the hammer form cocking as it was drawn back.

Michael :- )

[antithesis]

I had galling on a Prod Hammer.  There was a tapped hole in the top on the hammer.  So I screwed a Nylon bolt into the hole and spun it in the lathe and left it .030 fat.  Worked great.  Reduced cocking force and stopped the galling, also stopped the hammer form cocking as it was drawn back.

Michael :- )

Do you mean stopped any lateral wiggle by taking up slack, or kept it from catching the sear?🤔

I presume that was the hole that normally holds the set screw that locks the striker in position? I have nylon tipped stainless bolts that would be close to perfect, the tip will even give a TINY bit under pressure. I bought em for a drag screw to replace the 1/8" one cothran provides on his rva units.

(PM me Mike, the goodies are here😎)

Knife,

Besides the grippy factor you mentioned, does the free fiber from the composite seem to be potentially abrasive? I know that stuff is tough but I dunno about sliding bearing use