Delrin Question
I am going to mount a 26MM scope in some 30MM rings using Delrin inserts. I'll have to trim the length of the inserts. What's the best way to trim Delrin?
Thanks!!!!
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Temporarily mount the scope and scribe the proper length on the inserts. Remove the inserts and tape them together securely. Using sheets of sandpaper on a flat surface remove the extra material, finishing with a fine grit. Bob
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Thanks for the good ideas, Bob. I appreciate your response. Do you know if Delrin is heat sensitive?
I have to remove about .250” from the shims. I was considering cutting them close with a Demel saw blade then finish sanding as you suggested to the final dimension. I also thought about making a small jig for the disc sander. I guess ¼” is enough to experiment with to see if heat turns it into silly putty.
Ken
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Go slow with a disc sander with frequent breaks because of the friction. The melting point is only about 375 degrees Fahrenheit. It will start to get soft well below that temp and you don't want to distort it. Better it takes you an extra 1/2 hour and the shims stay concentric. Bob
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Good advice, Bob, 375 degrees isn’t very hot. Actually, that’s surprisingly low. I can get there very quickly with power tools. Hand tools are sounding better now.
Thanks,
Ken
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Maybe a few passes on a coarse flat file, laying on your bench would remove a good chunk of it.
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I used brown Delrin a lot . It has excellent machine ability. It is an excellent bearing material and holders shape and tolerances well. Easy to cut with a fine tooth power saw of any type. They have a few different colors and each one machines differently, brown and black are the best.
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and it seems that all colors will emit an odor similar to formaldyhide when machined
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I always thought Delrin was a bit slippery. I wonder if that may turn out to be an issue.
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