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Questions tagged [drill-bit]

38 questions
16
votes
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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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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13
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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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11
votes
4 answers

How can I drill my own electrical knockout?

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

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
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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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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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2
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2 answers

Drilling holes in towel hanger hardware

I'm trying to hang a towel hanger, but with my own anchors. I'm struggling to drill a hole in the steel hardware that gets bolted to the wall: I'm using a hand drill, running at about 450rpm. I've tried a HSS stepper bit, 1/8" HSS bit, and a 1/4"…
flaviut
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1
vote
1 answer

Bit slipping on pocket hole screw

I have kreg #2 screws and i’m using the #2 square bit that it comes with. So I know the bit is not the problem. But when I drill and get less than half way in the bit starts slipping off the screw head. I don’t know what i’m doing wrong with the…
user164851
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1 answer

What to do when drilling into steel has no effect?

I read a few online articles on drilling into metals. The advice is mostly the same: Predrill a smaller hole. Drill slowly — low rpm. No need for fancy equipment — any drill bit specialized for metal will do. My problem is that I can make holes…
Martin Drozdik
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1
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2 answers

What diamond drill bit size is recommended for 1/2" pipes?

I have 2 pairs of copper stub outs (1/2") and one 1/2" PEX pipe that I need to drill holes in porcelain tiles I can't figure out what diamond drill bit size to order. This chart tells me I need an 1" diamond drill bit but it seems too much
MiniMe
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0 answers

Is 6 holes in ceramic tiles the life of a drill bit?

I have always been unwilling to drill into ceramic tiles for fear of cracking them. But tomorrow, I am having a tile wall demolished, so I figured today I would get some drilling practice in while the stakes are zero. I bought a "Glass & Tile Drill"…
Oddthinking
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