[jerry1122]

Hi all, I have just started on cnc zone so here go's.
I need to drill a .094 or # 41 hole 1'' deep in copper can you get me started on speeds and feeds thanks.

jerry1122

[gsrmmeza]

This is what Chicago Latrobe recommends:
RPM = 3.82 X SFM / drill diameter
SFM = 140 - 200
FR = RPM x IPR
IPR = .001 - .002



RPM = Revolutions Per Minute
SFM = Surface Feed Per Minute
FR = Feed Rate
IPR = Inch Per Revolution

RPM = 3.82 X 140 / .094
RPM = 5689

FR = 5689 x .001
FR = 5.689

I would use a HSS Tin coated drill.
You could also call Chicago Latrobe Technical Information 888-434-4311

[jerry1122]

Thank you I am going to give it a try.

[fatal-exception]

Milk as a lubricant apparently gives an excellent surface finish. One of those old trial and error things I read in a book somewhere.

Paul

[youngjim]

I read also about grinding the cutting edge square. It might be worth a search.

[jerry1122]

I have it drilling good now 1600 rpm and 30.5 feed.
I need to run 8,000 per month so will see how it goes.


Thanks jerry1122
muskegon mi.