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Questions tagged [drill-bit]

47 questions
16
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4 answers

What does the colour of drill bits mean?

I bought this set of drill bits. The set came with 3 colours of drill bits: Silver Gold and Black I do not know. What does each one of these bit colours mean?
asmgx
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15
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11 answers

Is it safe to use a drill bit with a half broken tip?

I broke the tip of the masonry drill bit. The tip looks like this now. Half of it is missing, and it seems that the tip itself moved slightly towards the center (since at the bottom, it is parallel to the shaft). Is it still safe to use the drill…
Arseni Mourzenko
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14
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11 answers

How can I drill through small thin hardened steel wrenches?

I have a couple wrenches that came with my mini air powered die grinder. I want to put a hole into the top so that I can attach a wire or string so I don't lose them. I used a punch to put a dimple into the wrench. I am trying to drill a pretty…
Fresh Codemonger
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12
votes
7 answers

What type of bit do I use to drill holes in stainless steel? Nothing seems to work

I recently bought some Damascus 1 inch ring stock (304 and 316 stainless). I sliced off about 8 mm of it using a bandsaw. I then stuck it in a vice and attempted to drill through it. I have tried silver/cobalt drill bits, masonry bits (didn't even…
Rilcon42
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11
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4 answers

How can I drill my own electrical knockout in an appliance housing?

I would like to drill a regular (I think 3/8") knockout on a metal appliance housing. It is not tabbed like on a metal handy box. Which drill bit should I use?
amphibient
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5
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3 answers

What is the purpose of these drill bits with two tips?

A friend of mine likes to buy old tools and smilar at car boots, and he picked up a set of bits which neither he nor his friends could identify. He showed me two of them: They have two tips, one mounted radially outboard of the centre tip but…
bertieb
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4
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4 answers

What do the 1/4 , 3/8, and 1/2 in the impact drivers mean?

I bought my first impact driver--a Worx 1/4 & 3/8 impact driver. I am trying to buy sockets and realised that these sockets come with drive sizes mostly 1/2". I read more and I found that the head of this bit is the size, but the bottom size seems…
asmgx
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3
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1 answer

What drill bit should I use to drill a 2-1/2" hole through 8" of concrete?

I'm having some electrical upgraded and I need to drill a 2-1/2" hole through my 8" foundation. The foundation is poured concrete and has small rounded stones inside. This house is almost 100 years old so I'm expecting the concrete and stone to be…
CodeVar
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3
votes
1 answer

Why is this wood on my drill bit from wall framing a different color?

I was installing some new blinds and when I drilled into the framing above the window my drill bit had a darker color wood dust on it. Other places I have drilled at the dust is the standard wood color but this was darker and sticky. Any idea why?
DR9412
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3
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1 answer

pilot bit for masonry hole saw

This seems like a stupid question, but I cannot figure it out ... I have a couple of masonry hole saws (carbide tips) that I am using to drill holes through a cinderblock foundation wall for various purposes. I have a mandrel for the hole saws. It…
RustyShackleford
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3
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4 answers

Why can’t my hammer drill drill a hole in concrete?

I do have a hammer drill (Bauer 7.5amp, Harbor Freight) and some 1/2“ Bosch masonry hammer drill bits. I‘m trying to drill a hole into my concrete patio. I have made it one inch deep but that destroyed two drill bits. One drill bit tip cracked off…
mitchkman
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3
votes
3 answers

Tricks for fitting a 7/16" bit into a 3/8" drill?

I have a 3/8 hand-held drill and that's pretty much all I need for my projects. But now I have a project where I have to insert large dowels, and they will need a 7/16" hole. I don't have that size bit, but before I rush out and buy one only to find…
user766353
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2
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4 answers

Removing a broken SDS drill bit from the chuck

I have an SDS drill, with the bit broken off inside the barrel. Stripped a lot down, and can move the offending remains about an inch, using a magnet. Then it gets stuck. Tried oxy-acetylene to heat up the barrel, thus making the hole inside…
Tim
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2
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1 answer

Drill speed for ceramic tile

I am about to make holes in a ceramic tile (in order to attach an Ikea piece of furniture in the bathroom). As this is the first time I am going to do this, I have done some research and bought some equipment - like diamond bits. However, I am…
Roger V.
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2
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2 answers

Drill hole size for a given screw size in tile

I need to install a grab bar in a ceramic-tiled shower. I plan on drilling through the tile and screwing into studs (no anchors) with stainless steel screws. I know I need to use a carbide or diamond bit, but what I'm wondering is, what size hole…
yroc
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