Drilling through stainless 3/8" steel bolt

Deodiaus · 2015-07-13T08:02:49+00:00

I am trying to drill though a stainless 3/8" steel bolt (grade 6) on a poo l pump. How long should it take to go 1/2 inch? I think after an hour, I managed to get through 1/8 inch using oil as a lubricant. I am using a 1/4 Dewalt Cobolt bit from Lowls (listed for stainless steel). Is this better than the Irwin titanium bits? I have some diamond bits from Harbor Frei ght tools, but it seems as if the diamond dust was scraped off very quickly . Any suggestions on what else to do, i.e. take it to a mechanic who will cha rge $50 an hour. Are there any suggested drill bits made from industrial di amonds or are they overpriced?

Jul 13, 2015 24 Replies

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rbowman 10 years ago

I've got one of the egg beater types. A decent one with two pinion gears is the ultimate cordless drill.

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Micky 10 years ago

I had one, and it must have been stolen**. I don't know when though. The tools in my car were stolen once, but I wouldn't have carried it in the car.

I once saw a car tool set, labeled as such with a form-fitting plastic box and some car-typle tools, but one of the tools included was claw hammer.

**I do have a brace and some bits.

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notbob 10 years ago

When I worked as a machinist, to avoid confusion, we used the descriptive term of the machine. For example, an electric hand drill was a "drill motor". The singular term "drill" was reserved for various size/type "drill bits", which could be used in any number of machines with drill bit chucks, including drill motors, drill presses, milling machines, lathes, etc. ;)

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Shade Tree Guy 10 years ago

If in the Service, a drill might really get confused

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makolber 10 years ago

wear saftey glasses

Mark

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