Mibro quick start drill bits from Tractor Supply are garbage.

[JES]

Yeah, down here at the shop, all we use are either cobalt or carbide. We work with mainly stainless steels. Glad ya got it done.

As a professional hole driller, what brand of drill bit do you recommend?

When I was in the Navy as an MR, the first thing we made in our A school was a drill bit gauge, 59.5 degrees, then we learned to sharpen our own bits and cutting tools for the lathe, lots of finger tip blisters from sharpening on a bench grinder, lots of good memories from that.

[cva34]

Never seen Drill -Tap fluid mentioned ...keeps heat down and extends bit life and correct there is a lot of bits cheap junk (some not so cheap)out there...

[Brute Killer]

Never seen Drill -Tap fluid mentioned ...keeps heat down and extends bit life and correct there is a lot of bits cheap junk (some not so cheap)out there...

We used cutting fluid for drilling holes on a press in ag shop, but that's about the only place I've ever used it. I was just trying to drill through the 1/8-inch web on a T post. It was already pounded in the ground, too.

[Kingfisher789]

Don't run them at a high RPM in your cordless drill.

Yes sir. Hi speed for wood. Low for steel. Work gets done bits last longer

[Goldeneagle]

As a professional hole driller, what brand of drill bit do you recommend?

When I was in the Navy as an MR, the first thing we made in our A school was a drill bit gauge, 59.5 degrees, then we learned to sharpen our own bits and cutting tools for the lathe, lots of finger tip blisters from sharpening on a bench grinder, lots of good memories from that.

Our HSS are C-L and our cobalt are PTD.

If you're running the right RPM, you can get by with a shot of WD-40 every once in a while. It's better than nothing.

[JES]

Our HSS are C-L and our cobalt are PTD.

If you're running the right RPM, you can get by with a shot of WD-40 every once in a while. It's better than nothing.

I have been using a cutting oil and slow RPM, it's all about speed and feed.

[Rubberdown]

it's all about speed and feed.

That's what she said.

[Goldeneagle]

I have been using a cutting oil and slow RPM, it's all about speed and feed.