Drill bits...which ones?

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Puff
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Drill bits...which ones?

Post by Puff » December 28th, 2015, 9:29 pm

This is something I'd like to be able to use and re-use over and over. For thirty plus years I've bought both junk and good drill bits. Even some higher priced drills don't seem to hold up.

When I built the log splitter, my neighbor who moved had great ones that, with a bit of cutting oil, repeatedly drilled through 1/2" mild steel with 7/16 holes and were fine when we finished. I'm looking for a compromise between low and ridiculously high prices but more on quality.

Is there a brand and type that would be worth buying once and hold up with intermittent use for the next 6-8 years?


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Re: Drill bits...which ones?

Post by Rodcrafter » December 28th, 2015, 9:40 pm

I pretty much just use cobalt bits from Fastenal. But I have learned that if the drill ties slow with coolant like 90 weight gear lube the bit won't get hot and will drill many holes.


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Re: Drill bits...which ones?

Post by Frank_Cox » December 28th, 2015, 9:48 pm

yep, proper lubrication saves them all! but for most hole drilling I use the ones from lowes that come in the "multi-big-ol" pack. they seem to hold up well for the price.
I have used these bits also and really like them!!!
Click here : KFD29J-PC drill bit set


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Re: Drill bits...which ones?

Post by Rodcrafter » December 28th, 2015, 9:56 pm

Looks like a good choice


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Re: Drill bits...which ones?

Post by Pete Mazz » December 29th, 2015, 5:19 am

We go thru tons of drill bits at the shop. I broke down and bought a "Drill Doctor" and now the guys throw them in a pile and I sharpen them every so often. Works fine for our stuff (wood bits) but you can sharpen masonry bits as well.

http://www.drilldoctor.com/drill-doctor-750x.html


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Re: Drill bits...which ones?

Post by Clover Ridge Smokers » December 29th, 2015, 8:00 pm

I learned the hard way after buying a good set of bits but failed to use lubrication. They didn't last long at all. Then a machinist friend of mine told be about lubrication and the set of bits I have now are close to 10 years old.


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Re: Drill bits...which ones?

Post by Puff » December 29th, 2015, 10:47 pm

Well lubrication I have always used but even then cheap bits are rarely lasting for 6 holes. Then, they squeal even thru the lube and even stall the chuck if the belt slips on the drive at all.

Frank, thank you for that link....ordered a set tonight.


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Re: Drill bits...which ones?

Post by Rodcrafter » December 30th, 2015, 7:31 am

Do you run them slow or fast?


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Re: Drill bits...which ones?

Post by Puff » December 30th, 2015, 9:44 pm

Usually pretty slow maybe 400-500 rpm?


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Drill bits...which ones?

Post by Rodcrafter » December 30th, 2015, 10:08 pm

What kind of lube do you drill with? Easy boys.


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Re: Drill bits...which ones?

Post by Puff » December 30th, 2015, 10:13 pm

Haha...thanks RC. It is a sticky cutting oil made for drilling made by CRC


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Re: Drill bits...which ones?

Post by Rodcrafter » December 30th, 2015, 10:32 pm

I was drilling some 2"&21/2" holes today after seeing this thread, and I just even with a hole saw turn slow and keep 90-140 gear lube on them and they are still fine.


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Re: Drill bits...which ones?

Post by Puff » December 31st, 2015, 9:51 am

What is slow by your definition?


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Re: Drill bits...which ones?

Post by Rodcrafter » December 31st, 2015, 5:45 pm

I would say the slowest setting on the drill press, what ever that is. I don't put much pressure on them either. I made parts back home in a tank shop as a child. I drilled flanges in stacks 6" thick, it had coolant pumping onto the bit and it would feed the bit automatically. Some times I would have to sharpen the bit, that has helped me all my life. I had a tool in my pocket that hat the proper angle the bit was supposed to be at. So I would put it along side of the bit and check the slant of the cutting edge. I haven't seen that tool in 35+ years but still remember how to sharpen any size bit


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Re: Drill bits...which ones?

Post by Dirtytires » December 31st, 2015, 7:36 pm

I've had pretty good luck with WD-40.

I was fortunate enough to have the son of the guy who invented the product as a customer of mine. He was always good for a story.



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