lilman · Oct 20, 2013

Hi all,
Not sure if this is in the right place?

I found a very very strong magnet at work the other day. Bout the right size for extracting bits of broken half shaft. Now I want to attach it to a piece of dowel but not sure I would trust just gluing it. Can a magnet be drilled through? Would it affect the magnetism?
Yours
Thick twunt.

dodgyrob · Oct 20, 2013

If you drill through that magnet, the entire universe will implode. Leave well alone.

Defenderofthefaith · Oct 20, 2013

As he said. /\ /\

It'd be like crossing the streams in Ghostbusters.

Jam1 · Oct 20, 2013

You can but they do shatter easily, why not just make a secure cage or enclosure for it eg stick it in a steel pipe.

lilman · Oct 20, 2013

dodgyrob said:
If you drill through that magnet, the entire universe will implode. Leave well alone.

Now then, I might be a thick twunt but im pretty sure that wont happen................................will it

Thor1950 · Oct 20, 2013

dodgyrob said:
If you drill through that magnet, the entire universe will implode. Leave well alone.

epoxy would work

easye1 · Oct 20, 2013

should imagine it to be quite hard, so a top quality drill bit to be used, not your average joe bloggs drill bit.
I`d suggest doing it i a drill stand with magnet clamped or held secure in clamped vice, and using plenty of cutting fluid/oil to help cool the cutting tip of drill bit, not a fast speed and steady pressure on it.
even trying a smaller pilot hole first depending on your desired hole size.
over the years I have machined some very very hard materials used in just about every engineering principle, but never drilled a magnet.

Am I right in thinking magnet material is crushed together in huge forces to make the desired shapes ??
then normally ground to finish/required size ??

lilman · Oct 20, 2013

Jam1 said:
You can but they do shatter easily, why not just make a secure cage or enclosure for it eg stick it in a steel pipe.

Would the steel pipe not "drain" the magnet? Aluminium would work in that case.

martin1512 · Oct 20, 2013

lilman said:
Hi all,
Not sure if this is in the right place? I found a very very strong magnet at work the other day. Bout the right size for extracting bits of broken half shaft. Now I want to attach it to a piece of dowel but not sure I would trust just gluing it. Can a magnet be drilled through? Would it affect the magnetism?
Yours
Thick twunt.

The problem isn't with losing the magnetism, it is with the magnet itself. Almost all permanent magnets are made from Ferrometals, and Ferrometals are generally extremely hard, much harder than steel drill bits, so something like a Diamond or Cobalt bit is needed. The other problem is the swarf. This tends to stick to the magnet and the drill bit tip, preventing it from biting into the magnet efficiently.

Chrisw8 · Oct 20, 2013

and keep it cool while drilling it. I seem to remember heat knackers up magnets.

lilman · Oct 20, 2013

easye1 said:
should imagine it to be quite hard, so a top quality drill bit to be used, not your average joe bloggs drill bit.
I`d suggest doing it i a drill stand with magnet clamped or held secure in clamped vice, and using plenty of cutting fluid/oil to help cool the cutting tip of drill bit, not a fast speed and steady pressure on it.
even trying a smaller pilot hole first depending on your desired hole size.
over the years I have machined some very very hard materials used in just about every engineering principle, but never drilled a magnet.

Am I right in thinking magnet material is crushed together in huge forces to make the desired shapes ??
then normally ground to finish/required size ??

The idea of drilling it was just to get a screw through it and into a dowel so a 3mm hole would be plenty. Maybe ill have a practice on an old speaker magnet first to see how it goes.

SteNova · Oct 20, 2013

Plasma cutter?

DIFFLOCK66 · Oct 20, 2013

dodgyrob said:
If you drill through that magnet, the entire universe will implode. Leave well alone.

It's OK, the OP is in Plymouth so anything north of Birmingham is safe... but only whilst practicing on the old speaker magnet. I'm not sure what will happen with a neodymium one! :mad2:

DiscoPol · Oct 20, 2013

Dunno about drilling em, but if you try to gently tack weld em to summat the certainly dont ever work again DAMHIKIJD

lilman · Oct 20, 2013

Ill pop up to skipton and drill it then

DIFFLOCK66 · Oct 20, 2013

lilman said:
Ill pop up to skipton and drill it then

Fine by me - I think I'll be protected by the Pennines....just!

johnlad · Oct 20, 2013

problem is, with a magnet on a stick, as you put it into the axle it magnetises itself to the inner axle, making it nigh on impossible to get it onto the broken shaft

Pikey · Oct 20, 2013

telescopic magnet works fine. got BB's broken halfshaft out with one.

lilman · Oct 20, 2013

DiscoPol said:
Dunno about drilling em, but if you try to gently tack weld em to summat the certainly dont ever work again DAMHIKIJD

What happened? Or it just didn't?

lilman · Oct 20, 2013

johnlad said:
problem is, with a magnet on a stick, as you put it into the axle it magnetises itself to the inner axle, making it nigh on impossible to get it onto the broken shaft

This a pretty strong magnet so maybe glued into a piece of ally pipe will stop it sticking too much inside the axle.

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