Delrin work - Page 2

Railgun · 10-15-2007, 08:28 PM

Carbide actually rarely takes as keen an edge as HSS. And HSS doesn't seem to take as keen an edge as a good carbon steel. For example I would not want to try to shave with a razor made using most grades of HSS and definetly not carbide.

I've done a fair amount of delrin work over the years. I use my highest speed setting on my own lathe but that isn't that high since it's a 12x36 and runs maybe 1500 rpm tops. I'll check though.

Drill bits for working any plastics should be keenly sharp. I also don't recomend a high feed rate. The chips coming off for delrin should be around the same thickness as writing paper give or take a very little bit. If they are more solid than that it's stressing the delrin around it too much IMHO if the remaining material is something like a bolt. As mentioned it is paramount also that you don't let the chips load up in the flutes and start binding. The friction from that will build up heat VERY fast and this may well be why you're having troubles. If the chips are not literally flowing out of the spirals then pull the drill bit back to clear the chips often. For deeper holes using something like a 1/2 inch drill this may be a pulling out to clear for each 1/8 inch forward. But it's critical to clear those flutes or the buildup causes a heap of friction.

Same with turning the delrin. The HSS tooling has to be fresh from the grinder and it should be a finer stone so it's got a fine keen edge. If your tooling is sharp it won't get hot enough to melt.

op4_camper · 10-15-2007, 09:30 PM

We feed the snot out of delrin. Just use plenty of coolent use g83 instead of g81 and If its old delrin then you might have to feed into part no matter what.

MassDestruction00 · 10-22-2007, 07:24 AM

I have had real good luck when milling delrin you actualy use a single flute router bit instead of a endmill. same goes for acrylic.

merc · 10-26-2007, 08:26 PM

like people said run and feed a little slower. at work we always use wd40 when cutting plastics. we buy 1gal cans and use a spray bottle.

10-15-2007, 08:28 PM	#11 (permalink)
Railgun Post Whore Join Date: Oct 2006	Carbide actually rarely takes as keen an edge as HSS. And HSS doesn't seem to take as keen an edge as a good carbon steel. For example I would not want to try to shave with a razor made using most grades of HSS and definetly not carbide. I've done a fair amount of delrin work over the years. I use my highest speed setting on my own lathe but that isn't that high since it's a 12x36 and runs maybe 1500 rpm tops. I'll check though. Drill bits for working any plastics should be keenly sharp. I also don't recomend a high feed rate. The chips coming off for delrin should be around the same thickness as writing paper give or take a very little bit. If they are more solid than that it's stressing the delrin around it too much IMHO if the remaining material is something like a bolt. As mentioned it is paramount also that you don't let the chips load up in the flutes and start binding. The friction from that will build up heat VERY fast and this may well be why you're having troubles. If the chips are not literally flowing out of the spirals then pull the drill bit back to clear the chips often. For deeper holes using something like a 1/2 inch drill this may be a pulling out to clear for each 1/8 inch forward. But it's critical to clear those flutes or the buildup causes a heap of friction. Same with turning the delrin. The HSS tooling has to be fresh from the grinder and it should be a finer stone so it's got a fine keen edge. If your tooling is sharp it won't get hot enough to melt. __________________ I had a "Paintball God" moment once. Like Al Bundy's Polk High football moment I live on for the slim chance of repeating that one time miracle in some small way.........

10-15-2007, 09:30 PM	#12 (permalink)
op4_camper Seasoned Member Join Date: Apr 2006 Location: Somerset Pa	We feed the snot out of delrin. Just use plenty of coolent use g83 instead of g81 and If its old delrin then you might have to feed into part no matter what. __________________ Contact me

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10-22-2007, 07:24 AM	#13 (permalink)
MassDestruction00 MCB Member Join Date: Oct 2007 Location: Easthampton, Ma	I have had real good luck when milling delrin you actualy use a single flute router bit instead of a endmill. same goes for acrylic.

10-26-2007, 08:26 PM	#14 (permalink)
merc Active Member Join Date: Jul 2006	like people said run and feed a little slower. at work we always use wd40 when cutting plastics. we buy 1gal cans and use a spray bottle.