PRIMER ON CENTER DRILLS #959 tubalcain countersink

Who invented the combination center drill?
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[lathammarx]

Love those wood cases for the drills, there is just something about how everything was packaged back in the day. Now its just plastic garbage that cracks and breaks. Great video on center drills, Tubalcain 👍

[daleties]

Thanks for posting. I'm 68 now and some of my shop teachers are the ones I remember most, and most fondly. In fact, I don't remember ever disliking any of those guys. It's such a shame that they don't teach shop anymore, or do they? I had woodworking, metal working, electrical, and printing in middle school. Wood shop and machine shop in High school. The machines were all top notch & the teachers really great guys. I built stuff that I still have to this day. Sadly, a bygone era.

[drewlynford]

This is a great video Mr Pete! Thanks for making it. All the info you covered was absolutely pertinent. I am newbie to the machine shop so this was a clear way to present the topic. :)

[oitgdqt]

Mr. Pete. Another excellent video. Keep making them and we will keep watching.

[jimhart]

Definitely learned more than I thought. Thanks Mr Pete

[The_NASA_GUY]

Cheap center drills are one of the main reasons the tips break. And getting a tip off a part is an adventure. Thanks Mr. Pete!! I love the history lessons.

[alankeck]

Nope. You didn't tell me more than I wanted to know. I WANTED to know everything and you taught me a LOT. Excellent!

[Idontwanttosignupist]

The idea of a dedicated Morse taper center bit is a very good one. Thanks much!

[steveforbes]

This was another interesting video. I am certain that there is more to center drills than you presented here but, that will be for another class. Thank you.

[wayneallenca]

Love the detail and all the information presented, people don't know what they don't know, and videos like this leave nothing un-said. Thank you for all your effort and work to teach us who don't know.

[ChrisChandler-yg]

My WW2 vintage 17" Leblond has a lug on the tailstock for a dauber. It was still full of dried up white lead when I got the lathe, but no dauber. Since I run live centers almost exclusively, it serves as tailstock chuck key storage. Another excellent informative video!

[dbacp]

Raising my hand for having a Dauber on my TH54 Tailstock.

Thank you for another informative and useful video.

[FrankRoden-wmlm]

Thanks Lyle ....Like you I had a tool chest drawer full of center drills. And I still have a ton of them. I can't even give them away. Plus the kids today have no interest in that kind of stuff .

[randyfrieler]

Handy in the mill for starting holes too. Keep the videos coming, like em all !

[robert]

Well done. Very well done. I have a few cobalt center drills that I prize. I don't think I've ever broken one of them.

[voodoochild]

Without being able to take shop in school I loved this video! Please teach me more.

[SonOfMrGreengenes]

One VERY important thing that Mr. Pete did not mention is the fact that a center drill bit is designed to cut on the side of the flutes. This allows it to make a centered hole even if the tailstock center is not in perfect alignment with the chuck or if the center drill enters the stock off center. You can see this relief of the flutes by measuring the diameter of the pilot portion of the bit on the back edge of the flutes and then measure the front or cutting side. On a number 5 center drill bit the diameter of the back edge of the pilot will usually measure about 0.015 less than the front edge. So, unlike a twist drill bit, the center drill bit, due to this clearance, is essentially a side cutting bit... acting more like a boring bar than a twist drill bit. It, more than anything else, is what makes a center drill bit cut holes on center.

[roberthoug]

Yes it's all very interesting Mr. Pete keep them coming HOUGIE upper peninsula of Michigan carnivore Well I see you're getting the thumbs up we need more

[the.Blue]

Always instructional! Thanks, Mr. Pete! ⭐🙂👍

[donniee]

In my past I used the 60° tool to chamfer edges that called for a 60° chamfer
I have one of those Slocumb sets that was given to me when i was first learning the trade.