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36 votes
Accepted

Masonry bits dulling after 3-4 holes

The hammering action of the drill isn't activating So the bit is overheating due to friction. It is supposed to hammer the material you're drilling into dust then evacuate it, not rub it off through ...
bobflux's user avatar
  • 9,863
30 votes
Accepted

What is the right tool for old, rusty, flat cross head bolts?

Looking at the condition of the nut and the minimal profile of the head, I'm afraid the better question may be "how do I get these out with minimal damage to the wood?" I'd take a drill to ...
Greg Hill's user avatar
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28 votes
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How to drill holes in 3/8" thick steel plates?

3/8" mild (hot-rolled) steel isn't difficult to drill, but any bit will fail if you get it hot enough to melt the cutting edge. Each hole should take no more than a minute. Use a sequence of sizes (1/...
isherwood's user avatar
  • 139k
18 votes

What is the right tool for old, rusty, flat cross head bolts?

I would use a small grinder ( Dremel) with a cut-off wheel and cut the nuts off.
blacksmith37's user avatar
  • 8,311
17 votes

How to drill holes in 3/8" thick steel plates?

Cutting should be easy This is true for generally all tool-bit-upon-steel work. You should cut long, continuous "chips" (strings, really) that come off like pasta, to the point where you sometimes ...
Harper - Reinstate Monica's user avatar
15 votes
Accepted

Why does a driver bit shank have an indentation?

Impact (or hammer depending on your region) drivers have a locking mechanism which holds the bit in place: Usually the drill bit will just snap right in. To remove it you need to pull the collar ...
MonkeyZeus's user avatar
  • 16.6k
11 votes

What is the right tool for old, rusty, flat cross head bolts?

Normal flathead screwdriver in theory I believe these are simply used to make it easier to apply a flathead screwdriver with at most 90 degrees of turn adjustment needed. So in theory you can just ...
Graham's user avatar
  • 2,026
9 votes
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How to drill a 0.75" hole in metal

For a hole of that size or larger a hole saw might be an easier method as it removes less material and may be more likely to stay centered due to its pilot bit. However using the more standard bit ...
StayOnTarget's user avatar
  • 5,585
9 votes
Accepted

What are the grooves on the shank of my 16" masonry drill bits for?

Yes, that shank is for an SDS-plus chuck. It won't work well in a regular three-jaw chuck. The SDS shank has the advantage of fitting into a simple spring-loaded chuck, so that bits are simply pushed ...
batsplatsterson's user avatar
9 votes
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Are impact driver bits a different standard than screwdriver bits?

Those little bits aren't really made to go straight into the chuck. Even if the chuck is made to grip the little grooves, it's hard to see the tip with it so close to the chuck. There might not be ...
batsplatsterson's user avatar
8 votes

Drilling 1/4" steel plate and concrete?

No. Steel bits need to be very sharp to do their job. In fact, unless you set a depth gauge just barely through the metal, you'll wreck the cutting edge with every hole when you contact concrete and ...
isherwood's user avatar
  • 139k
8 votes

Masonry bits dulling after 3-4 holes

An SDS-plus hammer drill will make holes very fast using a bit that starts hardly sharp and rapidly becomes completely dull. It really doesn't care, because it's a pneumatic hammer action and the ...
nigel222's user avatar
  • 838
8 votes

Masonry bits dulling after 3-4 holes

The hammering action of the drill linked in the picture doesn't really need anything more than turning the dial to the hammer setting - it doesn't selectively "activate." It should be pretty ...
batsplatsterson's user avatar
8 votes

Adapter for 1/4" electric screwdriver to hold 3/8" bit

There are plenty of ways you can adapt a 3/8" bit onto a 1/4" drive. That's actually not your real problem. The real problem is that there is no way a basic screwdriver is going to be able ...
manassehkatz-Moving 2 Codidact's user avatar
5 votes

3-prong tamper proof screw type?

Here's what I eventually did to get the screws out: Used a Dremel rotary tool with a metal cutting wheel on it Cut slots across the head of each screw Used a flathead screwdriver to remove them Hope ...
Rawshark's user avatar
5 votes

How to drill a 0.75" hole in metal

I'd like to elaborate the step drill bit suggestion by @riseagainst IMO the best option by far for drilling medium sized holes in metal with handheld electric drills. Specifically I would recommend a ...
Thurston's user avatar
5 votes

How to drill a 0.75" hole in metal

To drill through metal, use a "slow speed and heavy feed". That is, make the drill bit rotate (relatively) slowly, but push hard. Also note that drill bits are directional -- they either cut when ...
unutbu's user avatar
  • 209
5 votes

How to drill holes in 3/8" thick steel plates?

The quickest and easiest way is to take them to a steel fabrication shop. They have hydraulic punches that would make short work of that. The church we used to attend had to build scissor trusses to ...
Andrew Neely's user avatar
5 votes

How to drill holes in 3/8" thick steel plates?

Do not under any circumstances use used motor oil, as has been suggested. As well as being filthy it is seriously carcinogenic and an environmental hazard and should only ever go to your local ...
tiger99's user avatar
  • 51
5 votes
Accepted

Is it safe to use short bits from manual screwdriwer with electric drill?

It's reasonably safe, but there's a small risk that the bit may slip into the chuck at an inconvenient time, Sockets are available to to hold these short bits improving reach and removing the risk of ...
Jasen's user avatar
  • 21.5k
4 votes

Drilling 1/4" steel plate and concrete?

If you mean non-magnetic , eg 304. stainless , you have a problem. I am assuming a limited amount of experience. If the drill turns without cutting , it coldworks the stainless making it even more ...
blacksmith37's user avatar
  • 8,311
4 votes

How to drill a 0.75" hole in metal

When drilling into metal always use a cutting oil, at the minimum use an oil to reduce the friction and heat build up. I know that sounds counter intuitive reduce the friction, however you are not ...
Ken's user avatar
  • 5,403
4 votes

3-prong tamper proof screw type?

These are indeed very rare. And old. Google image search kept showing old radio sets. After a lengthy search I found one source that should do the trick for you. Microtech Medium Domed Tri-Wing ...
SDsolar's user avatar
  • 2,007
4 votes

What drill bit size to pilot drill hole into stud for 15/64" lag screw?

When you're drilling and tapping threads into metal to accept a machine screw, you have to use the precise right size drills and taps. But you don't need to be real precise with lag screws in framing ...
batsplatsterson's user avatar
4 votes

What are the grooves on the shank of my 16" masonry drill bits for?

If you are unable to return the bit or cannot find a standard bit in that length you can cut the SDS portion off. They still work as a standard masonry bit in a driver/hammer drill albeit not as well. ...
Joe Fala's user avatar
  • 6,374
4 votes

Want to know how hex bit shank works and the history behind it's design

I'm going to throw out some opinions here that I don't have hard evidence to back up in form of citations. The Wikipedia article you liked kind of mentions this, but the reason hex shank (6 sides) is ...
JPhi1618's user avatar
  • 28k
4 votes

How to drill holes in 3/8" thick steel plates?

Use a 'speeds and feeds' calculator to determine the ideal combination for the material, diameter, etc. in question. This should help you get a feel for the best possible circumstance and see how ...
jobewan's user avatar
  • 41
4 votes
Accepted

Is there a universal colour code for screw bits?

The colour codes are NOT universal. There is no agreed upon universal colour code for colouring bits (to my knowledge). I have found that each brand (mostly) follows their own colour coding. ...
abdnChap's user avatar
  • 214
4 votes
Accepted

Magnetic impact driver bits

The bits I have go into a magnetic holder which is sufficient for most screws except, of course, the stainless ones...
Solar Mike's user avatar
  • 27.7k

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