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Old 10-30-2017, 04:16 PM   #1
Brute Killer
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Default Mibro quick start drill bits from Tractor Supply are garbage.

I drilled one hole in the web of a t-post and couldn't drill a second hole. It was dull at fast.
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Old 10-30-2017, 07:11 PM   #2
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A lot of the bits out there are pure junk.
When I get some that are cheap I'll do a quick oil quench and it improves them somewhat.
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Old 10-30-2017, 08:08 PM   #3
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Bosch bits are about as good a consumer bit as you can buy. My buddy gets me some once in a while from his supplier (he works in a machine shop)

Also, a Drill Doctor is a worthy investment.

I have buckets of drill bits, and when they get dull, I toss them in the ďto be sharpened ď bucket.

Once every few months, Iíll sit at the workbench, with a good cigar and a big glass of tea, and sharpen those dull and broken bits (yup, I can grind a new point on a broken bit too)



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Old 10-30-2017, 09:26 PM   #4
Brute Killer
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I've been eye-ballin' a Drill Dr. since Paul Harvey started advertising them. Haven't bought yet, though.
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Old 10-30-2017, 09:54 PM   #5
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Iíve had mine for close to 15 years.

It really appeals to my OCD and ADD tendencies.

I also like to squeeze more life out of my tools



I went to the woods because I wished to live deliberately...

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Old 10-30-2017, 10:35 PM   #6
sendit
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There's a good probability that the T post you have are hardened steel which doesn't help when trying to drill holes in them.


I was taught as a young man how to sharpen drill bits on a grinder, its a little tricky at first but once you figure out how geometries, angles and cutting edges work it's easy.

A side note is that alot of TSC stuff is Chicom %#*%

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Old 10-31-2017, 08:43 AM   #7
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Don't run them at a high RPM in your cordless drill.
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Old 10-31-2017, 11:27 AM   #8
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Quote:
Originally Posted by ramrod View Post
Don't run them at a high RPM in your cordless drill.
Yep. Good chance you ran too many RPM's.
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Old 10-31-2017, 03:37 PM   #9
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Ive never had any luck drilling into a t-post regardless of what brand drill bit I was using.
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Old 10-31-2017, 03:44 PM   #10
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Quote:
Originally Posted by ramrod View Post
Don't run them at a high RPM in your cordless drill.
Quote:
Originally Posted by Goldeneagle View Post
Yep. Good chance you ran too many RPM's.
I know how a drill works.

I bought two bits there and one was that one and the other one was the Cobalt variety, same brand. It was a $4 bit the one that got dull was like a dollar fifty. I ended up drilling plenty holes with the more expensive one with no problem.
I was trying to match a screw size and the 3/8 was the cheaper one and the 17/64 s or whatever it was was more expensive one.
I sure wouldn't have guessed that t-posts would be hardened steel though.
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Old 10-31-2017, 03:46 PM   #11
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Quote:
Originally Posted by sendit View Post

I was taught as a young man how to sharpen drill bits on a grinder, its a little tricky at first but once you figure out how geometries, angles and cutting edges work it's easy.

A side note is that alot of TSC stuff is Chicom %#*%
I learned how to sharpen bits in ag and actually had a knack for it. Just needed the little angle gauge thing and I was good. However, I do not own a bench grinder because I guess the only thing I would ever use it for would be drill bits. I have a hand grinder for working on welding projects.
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Old 10-31-2017, 03:49 PM   #12
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Quote:
Originally Posted by Gummi Bear View Post
Bosch bits are about as good a consumer bit as you can buy.
Thanks. I could use a new set. I bought a set of Black & Decker's that have actually been good and have lasted about 15 years. The little one's broke and the bigger ones are sure getting dull.
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Old 11-01-2017, 07:00 AM   #13
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Quote:
Originally Posted by Brute Killer View Post
I know how a drill works.

I bought two bits there and one was that one and the other one was the Cobalt variety, same brand. It was a $4 bit the one that got dull was like a dollar fifty. I ended up drilling plenty holes with the more expensive one with no problem.
I was trying to match a screw size and the 3/8 was the cheaper one and the 17/64 s or whatever it was was more expensive one.
I sure wouldn't have guessed that t-posts would be hardened steel though.
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.
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Old 11-01-2017, 07:32 AM   #14
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Good luck with a drill doctor. It may just be me but i have ruined more bits trying to sharpen them with that setup. I do better free hand with a bench grinder
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Old 11-01-2017, 08:14 AM   #15
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Pretty much everything TSC sells is cheap Chinese crap.
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Old 11-01-2017, 08:21 AM   #16
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Quote:
Originally Posted by Goldeneagle View Post
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.
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Old 11-01-2017, 08:25 AM   #17
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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...
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Old 11-01-2017, 09:22 AM   #18
Brute Killer
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Quote:
Originally Posted by cva34 View Post
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.
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Old 11-01-2017, 09:38 AM   #19
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Quote:
Originally Posted by ramrod View Post
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
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Old 11-01-2017, 11:29 AM   #20
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Quote:
Originally Posted by JES View Post
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.
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Old 11-01-2017, 11:37 AM   #21
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Quote:
Originally Posted by Goldeneagle View Post
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.
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Old 11-01-2017, 11:39 AM   #22
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Quote:
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it's all about speed and feed.

That's what she said.
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Old 11-01-2017, 11:39 AM   #23
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Quote:
Originally Posted by JES View Post
I have been using a cutting oil and slow RPM, it's all about speed and feed.
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