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Virtual Machine Shop Forum  |  Machine Tool Technology  |  Questions, answers, ideas  |  Topic: Drilled holes very deep « previous next »
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Author Topic: Drilled holes very deep  (Read 525 times)
Terry Montana
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« on: June 04, 2012, 03:13:00 PM »
Are their special machines or processes for drlling holes deep on a CNC milling machine?

Terry
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Geo.
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« Reply #1 on: June 12, 2012, 07:13:42 AM »
Terry, could you expand on this?
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ghoulardi
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« Reply #2 on: June 12, 2012, 02:03:56 PM »
 We use "gun drills" where I work for 1" x 36" deep holes. I've also used "ejector drills" for larger holes. These use a hollow tube and a high pressure coolant pump to force the chips back down the tube and into the hopper.
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Ron
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« Reply #3 on: June 12, 2012, 05:41:31 PM »
Quote from: ghoulardi on June 12, 2012, 02:03:56 PM
We use "gun drills" where I work for 1" x 36" deep holes. I've also used "ejector drills" for larger holes. These use a hollow tube and a high pressure coolant pump to force the chips back down the tube and into the hopper.


I'll go with gh but... When I was working at Rae Tee 50 years ago there was a complete separate building across the street dedicated to reaming, honing, and gun drilling. I've seen them but really have no idea how they work. One of our authors on the HIb grant had these animations made http://www.jjjtrain.com/vms/other_gun_drill/other_gun_drill_00.html

Ron
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