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I'm just looking for 1/4" delrin rod that I can drill and cut into transfer ports for the 78 series. Pretty simple stuff, actually. I think I found what I want on the Johnston Plastics site.
I should get out and get a set of numbered HSS drills while I'm at it.
Regards,
Doc Sharptail
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IMO, teflon is a far better material for transfer ports than delrin....going to be difficult to get it "just right" without machine tools.
Suggest you undercut one or both ends with a countersink or large drill bit...that'll help with establishing a seal and not having it crush. Hold the part in split wood blocks for drilling/undercutting.
Al
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So, another voice of experience speaks. :icon_mrgreen: Great!
I do have access to a so-so drill press. I've done some crude machining with it- cutting spring steps on valve stem bases, making brass pistons, etc...
The idea is to get port restriction, in a simple manner.
Would teflon be easier to work with?
Johnston is selling AC-2 Delrin, which is 22% Teflon...
Regards,
Doc Sharptail
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X2 on the Teflon rod for transfer ports.... softer than Delrin and therefore seals easier.... Since you're drilling a relatively small hole in a 1/4" OD rod, you won't need a lathe to do that as it won't matter if it's not perfectly straight or centered.... Cutting the ends square (assuming where the port seals is square) and to the correct length will be the hard part.... Spin it in a drill press and use a sanding block or file?....
Bob
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Thanks, guys. I'll try with the Teflon...
Regards,
Doc Sharptail
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Can anyone tell me what would be good to make the hard plastic valve stem seal like in the crosman 38`s?
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1 Attachment(s)
Attachment 964
Believe those seals are a high durometer urethane...would likely try teflon if the proper material cannot be sourced. IIRC, Len was able to get urethane rod to machine into springer piston seals. Not sure where.
Could pop over to the FT forum and ask him???
Al