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 Post subject: Re: Drilling Misshap
PostPosted: Wed Aug 23, 2017 5:25 pm 
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Joined: Fri Mar 27, 2015 1:56 pm
Posts: 40
Historian wrote:
cdakers wrote:
Historian wrote:
If you don't have a drill doctor, buy one.


What model did you purchase? I've been wanting/needing one, but have heard mixed reviews on the some of the lower end models.



"Drill Doctor® Model 750X Bit Sharpener, 3/32" to ¾""

This model covers full range of drills. I also purchased a spare diamond wheel as
back up ... always have a back up.

Just used it again yesterday prior to drill in SS + Castroil Moly.
'Like cutting butter' :)

Best


Thanks Historian, I'll give that model a go. I've got so many dull bits I could probably spend a weekend getting them all back in working order.


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 Post subject: Re: Drilling Misshap
PostPosted: Wed Aug 23, 2017 8:43 pm 
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Silent But Deadly
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Location: NW Wa. state
T-Rex wrote:
This is my Drill Dr :lol:


I sharpen mine by hand on the bench grinder too, although I don't even have one of those guides. I'm good down to ~3/16", smaller than that gets tricky for me to sharpen by hand.


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 Post subject: Re: Drilling Misshap
PostPosted: Wed Aug 23, 2017 11:57 pm 
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Silent But Deadly
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Location: CT - The AntiConstitution State
yondering wrote:
I'm good down to ~3/16", smaller than that gets tricky for me to sharpen by hand.

For the Lil guys, I put them in a small vise. It has a V notch that runs horizontal, down the center of the jaws. Lock the bit with a cutting edge about level. Place the point gauge on the bench, under the bit, and align by eye. Then, use a myriad of stone and ceramic blocks to sharpen the bit, whilst keeping them lined up with the gauge. Not too bad cause the little ones usually need but a few passes.

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 Post subject: Re: Drilling Misshap
PostPosted: Sun Aug 27, 2017 10:12 am 
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Yes you need to use a center drill, slowly, and start drilling with the center drill down to the bigger angle. That will give your bit a good starting point and if the center drill goes through that alleviate some of the pressure on the drill point. Which will reduce some of the heat that builds up.


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 Post subject: Re: Drilling Misshap
PostPosted: Mon Aug 28, 2017 11:24 pm 
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I don't work with a lot of hard materials, but I have drilled holes in steel targets before (AR500).
Carbide, carbide, carbide. Something hard enough to actually cut the material without being damaged.

I drilled several holes with a center-cutting carbide end-mill, it worked just fine (in a mill). In a drill press I expect it would want to wander, lots of radial load. I'm sure someone makes carbide drill bits, though.


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 Post subject: Re: Drilling Misshap
PostPosted: Tue Aug 29, 2017 4:31 pm 
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We couldn't save either of the baffles due to the holes already put in them. We put them on a bench sander and we got one to .42 and another to .47.

Image

Should I still consider using them?
I've already cut a spacer to replace them at the end off my can which measures 1.41 inches before the exit end cap.


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 Post subject: Re: Drilling Misshap
PostPosted: Tue Aug 29, 2017 6:09 pm 
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Silent But Deadly
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Location: CT - The AntiConstitution State
I don't see why you couldn't drill the baffles? Even if the metal was work hardened, 17-4 reaches a max Rc of >50. Carbide, even uncoated, is very capable of penetrating this. I thought there was mill access? If so, did you try trochoidal milling? That would definitely chewed threw even the hardest tool steel.

Anyway, onto your question. 2 baffles, even oversized, are better than none.

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 Post subject: Re: Drilling Misshap
PostPosted: Tue Aug 29, 2017 7:09 pm 
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T-Rex wrote:
I don't see why you couldn't drill the baffles? Even if the metal was work hardened, 17-4 reaches a max Rc of >50. Carbide, even uncoated, is very capable of penetrating this. I thought there was mill access? If so, did you try trochoidal milling? That would definitely chewed threw even the hardest tool steel.

Anyway, onto your question. 2 baffles, even oversized, are better than none.


The holes already in the baffles prevented the lathe from staying center. I'll use these as blast baffles. Thanks for answering my question.


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 Post subject: Re: Drilling Misshap
PostPosted: Tue Aug 29, 2017 7:26 pm 
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Silent But Deadly
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Location: CT - The AntiConstitution State
For anyone who happens to find themselves in a similar situation:
Forego worrying about center, for the start.
Indicate the baffle from the OD
Using a facing cutter, move away from center, plunge into the work and move towards center (light cuts are fine)
Do this until there is a flat spot
Center drill, drill, and ream if need be

If you've managed to make a terrible hole w/ the center drill or a pilot drill, do the following:
Indicate the work as above
Mount and center a small end mill (.125") in a tool holder, w/ a cutting edge level
Move the end mill into the work and try to just catch the hole
Take light cuts, boring towards the chuck, and you'll eventually get a nice round hole

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 Post subject: Re: Drilling Misshap
PostPosted: Tue Aug 29, 2017 11:20 pm 
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Silent But Deadly
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A face grooving lathe tool would've worked great here. Or just a boring bar plunged in on an angle.

Id destroy these two and start over.

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 Post subject: Re: Drilling Misshap
PostPosted: Fri Nov 09, 2018 10:31 am 
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Joined: Tue Oct 30, 2018 4:51 am
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Location: North Berhen,NJ
Thanks for this information!
Drills come in many different sizes and qualities with chinese drills leading the pack of cheap disposable drills that dont hold an edge very long, so is true for carbide and cobalt drills, you get what you pay for..usually if you go to JandLindustrial.com theylists all their tools as either import or domestic. Machinists know the difference between import and domestic tooling` Import tooling wears out too fast but is a great substitute when setting up a production job where you may break a tool or 2.
All the best: https://mechanicguides.com/best-cobalt-drill-bit-sets/


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