Mark Barone
Well-Known Member
Which type of bit will drill through steel. I keep buying the wrong ones even they say they are metal bits?
It's not hardened steel. Just 1/8 inch 1095 .
I just have a cheap HArbour Freight drill press. Not super fast but I don't know the rpm. I was using 3:1 oil I'll look for the cobalt..
It is advertising. Faster how? faster speed or higher feed rate or faster drilling 100 holes because you didn't have to change bits? Cutting speed does depend on type of drill bit. go here and look at page 6, it gives speed and feed recommendations for 3 different drill bit materials when drilling O1. (http://www.uddeholm.com/files/PB_Uddeholm_arne_english.pdf) I think it safe to assume that these numbers would work for all high carbon, low alloy steels(1084,1095, 80CrV2, 52100.....) to find cutting speed, = 0.2618 x Diameter of drill bit in inches x RPM find other drilling formulas here http://www.guhring.com/documents/Tech/Formulas/Drilling.pdfIInteresting posts. I see other bits that say 2x faster ...6 x 10 x. Does that play into any of this?