You mean grind............How do you grind a 1/4x20
tap a 1/2 inch long in a hole with a Dremel without
grinding the bores threads off. You must have a lot
of time and an extremely steady/accurate hand.
Additionally how do you get the center of the abrasive
tip to grind when you plunge, seeing how it's surface
speed is minimal.
You have to be kidding. Have you ever even set foot into a machine
Videos are cheap to make and post. Show me a tap that you can drill
out. Then mill one out. This should be easy for you. You have said
you've done it many times.
First there is no doubt that carbide can cut hardened steel however
carbide made for steel is extremely brittle. The intermittent cuts
that would take place for 90% of all broken taps would make it a bad
and expensive choice.
Second, nice try at deflecting your response to the OPs question
You can drill high speed steel with a solid carbide bit available at any
good machine shop supply.
They are very pricey however and also very fragile. You also can get high
speed steel bits that have carbide tips brazed on. Those tend tobreak also
but it is easier to extract the broken bits of carbide rather than having a
big chunk of broken drill in a broken tap.
About the time I had mastered getting the toothpaste back in the tube, then
I learned my lesson after a couple of attempts. If this is on an
important part, I drop it off at a machine shop and pay a pro to do
it. Sounds like others may have had better luck.
On the welding group, several people have reported success welding a
washer to the end of the screw and then welding a nut to the washer.
Probably easier with larger bolts and may require more welding skill
than I have. I'll have to try it some day though.
I have a little mig welder at home and we have a couple at work. I always
use this method and it has never failed. I just build up the broken bolt
a little at a time. Bzzt, bzzt, bzzt... Either grab the nub with vice grips
or weld a nut over it. It might take a few tries. And not too hot-- don't
want too much penetration as to weld the bolt completely over! I used
to do this all the time in an automotive machine shop.
That works, but I've found that if someone used a crappy, low-quality
bolt, that it's damn near impossible to get weld to stick to it.
Fortunately, those are the same bolts that are easiest to drill out.
replace "roosters" with "cox" to reply.
The best screw extractors I've ever used were of the type shown in
the link below. The type is available from several manufacturers
with different brand names but they're all virtually identical.
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