2:56 tap in copper

[35K chipper]

i have a part to make from c10100 oxygen free copper with 0.0005 electroless nickel plate.

2:56 unc 2B thru 16x. material is 0.350 thick.

cut or roll tap???

drill size???

oversize tap for plate???

tap depth is 4 diameters. peck tap???

feed and speed???

 

35k

[Bruce Caulley]

2B tolerance should allow for 0.0005" plate. In metric taps at least, the G class plating taps are 0.05mm/0.002" oversize (I think), so anything under that probably isn't worth worrying about.

 

I'd roll it, but I haven't had to use that particular grade of copper before, so there may be a gremlin that I don't know about.

 

Bruce

[35K chipper]

thanks Bruce. my big worry is the tap bind in this sticky stuff. sounds like test time.

 

35k

[Guest CNC Apps Guy 1]

I'd use cutting oil too just to be on the safe side.

 

I've never single pointed that deep, only .210 in Ti. You can always call Harvey Tool and see of they can hook you up with one to go that deep.

 

HTH

[35K chipper]

thanks James. note to self call harvey tool monday early 3hr time diff.

 

35k

[#Rekd™]

+1000 to adding cutting oil.

 

John

[Jmick]

We tap this grade all the time and cut tapping is the way to go. Use oil and a tap that has a abrasive resistant coating as this is abrasive.