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#1
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Hi guys, I know this probably belongs in the general forum but I though that I would ask it here. I remember seeing a post similar but cant find it. I am doing a run of delrin parts for someone and wanted to ask if you guys machine with coolant? is a 2 flute hss em ok? what sfm would be good to start with using a .5 em? thanks mark |
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#2
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| I don't think you will need coolant. Here is a nice feed/speed chart for carbide em's on metals. http://www.ultra-tool.com/Catalog%20PDF/Page%2029.pdf Here is another that does include plastic. http://www.menlo-usa.com/enguide/eg5.html Check out the spindle speeds on this chart just for kicks. http://www.kyoceratycom.com/pdfs/160...ltiple_CLs.pdf Another interesting one. http://www.lexcut.com/technical-support.php
__________________ Lee |
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#3
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| Yes use coolant, plenty of it. Use two flute cutters, high helix in micrograin carbide to get a reaaly sharp cutting edge, new cutters....don't use one that has touched metal. Run at the same speed you would do for aluminum: I would run 0.5" dia at 10,000rpm and feed at up to 200ipm depending on the finish I wanted. The most important thing is fixturing!!!!! Delrin is slippy and not as hard as metal, and you cannot cinch vice jaws down tight because it distorts so if you run a fast feed with a high helix cutter you will rip the part out of the vise. Moderate your speed when holding in a vise. If the part is very securely held go like crazy.
__________________ An open mind is a virtue...so long as all the common sense has not leaked out. |
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#6
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![]() Also if you fill your mill enclosure or the floor around with fine Delrin chips you run the risk of discovering that Delrin burns very efficiently with an almost invisible flame and a very acrid odour; which does not do your respiratory system any good at all....it is formaldehyde.
__________________ An open mind is a virtue...so long as all the common sense has not leaked out. |
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#7
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Terrific, I will be posting some pictures in Vern's 'Missing Person' thread later, probably on the weekend. The dinner you missed before Westec was also a success; overall a very pleasant evening. Donkey Hotey has promised to organise it for next year.
__________________ An open mind is a virtue...so long as all the common sense has not leaked out. |
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#8
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Thanks, Geof. No more coolantless delrin turnin.
__________________ Lee |
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#9
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| I am sorry I missed it. Did Donkey come down and meet up with you? Hopefully I will be in town next year for westec and I can join you guys. Mark |
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#10
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He missed it due to a deadline for some parts. One of the problems of running your own business, you can't just goof off and let somebody else do it.
__________________ An open mind is a virtue...so long as all the common sense has not leaked out. |
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#12
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But my trip fourperf referred to is one of the benefits of running your own business and being lucky, working hard, and having reliable employees. It works both ways.
__________________ An open mind is a virtue...so long as all the common sense has not leaked out. |
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