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Old 06-30-2019, 10:53 AM
wpshooter

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best drill bit for drilling pilot hole in gun sight screw



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Which type (titanium or cobalt, or other) drill bit would be best for attempting to drill pilot/starter hole (to use easy-out on) in broken off gun sight screw ?

Thanks.
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Old 06-30-2019, 11:37 AM
fourbore is online now
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Tough to say. That is so small. I guess in an ideal world, you would face i off flat, with an endmill. For drilling a center drill is very rigid. You can google both of those if you need. They could both be driven from a drill press.

I was shocked to successfully remove a broken no6 tap with a wilton screw remover. Darn thing actually worked. It does require real finesse. And for me multiple finger sets. OK, I just realize that was a tap. Not a screw. Getting old, sorry.

I dont believe I ever had any success with an easy out. I have drilled out enough material that I could pick out the remains (out bits) of a screw.

You may also like to know that Brownell sells over size taps and screws in No6 size.

If red loktite is involved heat will soften that up. Heat is always good in moderation.

To answer the initial question, a solid carbide drill with a spade tip is better for this than any conventional twist drill. Maybe better than a carbide center drill? You want it nice and short too. stiff. Everything lined up and clamped down solid.

Last edited by fourbore; 06-30-2019 at 11:58 AM.
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Old 06-30-2019, 06:16 PM
GH41

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I am sorry but if the OP has to ask the question he probably isn't capable of doing the job. Maybe he should enlist a professional.
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Old 06-30-2019, 06:59 PM
JHB51 is online now
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Take it from a retired Toolmaker bring it to a Gunsmith it will be more expensive to repair if you mess with it and then bring it to him.
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Old 07-02-2019, 09:50 PM
6PtStar
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I have had better luck removing broken scope base screws by using a small dental burr I talk my dentist out of. I use it to cut a screwdriver slot in the broken screw and use a small screwdriver to back out the broken piece.
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Old 07-04-2019, 01:12 AM
Guy
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Well....

A left hand bit has removed several broken screws for me before I was even done with the pilot hole.
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Old 07-04-2019, 03:49 AM
55fairlane
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As a tool and die maker, if you having to ask this question, my I suggest you enlist the help of a gunsmith....

Me personally on screws that small, I "burn them out" with the use of a tap desinigrator or EDM...

But in this case punch top flat with an end mill, center drill, use a left hand drill to drill out and hope you back the screw out......all this work must be done in a milling machine.
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