.024" holes in ultem 1000

[John13]

I have a question I need help with please. I have to drill .024" holes in ultem 1000 .080" deep. The material I was using was ultem 2300 (glass filled), I was drilling right to depth with no pecks and it was working great, well, they changed the material on me and now I have to use ultem 1000 (no glass) and the material is sticking on the drill and melting.

 

How can I get it to not stay on the drill and melt? Would peck drilling fix this? The part has 3564 holes that I am doing with 3 drills. Any help or suggestions would be greatly appreciated. Besides the obvious get more 2300 which would be my choice.

 

Thank you

[Guest]

dont know the material but have had real good luck with carbide circuit board drills indicated tru with in .0001 in some pretty nasty materials.

 

ds

[crazy^millman]

Peck it or get a parabolic drill for aluminum. Very gummy, HSS tools work better than carbide on this stuff.

 

HTH

[John13]

I decided to flood it with coolant. I don't really like coolant with plastic because of clogging the filter but for these holes there isn't too much plastic.

 

Thanks. I'll remember the HSS drills for next time, this was a hurry we need to ship 2 days ago but yesterday will work too.

[Don S at Barefoot CNC South]

Pee Wee

You could try air instead of coolant also.

[TR Mfg.]

I peck drill it. .o3 deep per peck.

[Kannon]

what spindle speed are you running?

[John13]

6000 rpm

[Thee Dragracer1951]

I cut a lot of Ultem 1000

I would second the suggestion for using air instead of coolant.

I would also spin it harder than 6k if you can

[John13]

6000 is my max, I'll try air and pecking for the next part.

[Midwest]

quote:

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I'll try air and pecking for the next part

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"Don't try. DO.......or do not"

 

 

[cnc@gci]

I would slow the RPM down and speed up the feed rate to keep it from getting so hot.

[Thee Dragracer1951]

Air will take care of that...

[Namliek_J@TheeCircle™]

We have an air gun that lowers the temperature of the air. It works well. I would speed up the feed a "little" and see what you get.

 

 

Couldn't resist Keeb.

[Mike S @ S4A]

generally speaking there's two families of plastic: thermoplastic and co-polymer resin.

anything that's a thermoplastic can melt, like ABS, UHMW, or Ultem 1000 unmodified. Copolymer resins like acetal (delrin) PTFE (teflon) are the result of mixing chemicals which only become the plastic once mixed. while they don't "melt"

they may do nasty things at their molar heat of decomposition. A lower SFM (speed) and higher CPT (feed) like they guys above said should help.

Try the library material Acrylic as a starting point.