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Old 12th September 2007, 11:35 AM   #1
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Default Broken drill bit in chuck

The surgical pneumatic motor has a single piece chuck of about 3mm. A drill bit has broken and its end has remained inside. I tried banging the end on a rubber piece in order to force it out. It moves forward but not enough and stays inside at about 3-4 mm from the front end. The 3 slits on the chuck are very narrow and the bit cannot be pushed out by using a scalpel.

Any ideas....please.

Gajanan Phadte
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Old 12th September 2007, 11:57 AM   #2
tade is offline tade  United States
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The chuck isn't made out of aluminum with any luck is it?
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Old 12th September 2007, 12:30 PM   #3
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Heat is often used to expand one piece of a tight-fitting arrangement, so you might try and heat up the chuck and see if this loosens things up enough to let the bit come out. Some silicone lubricant might help.

Also, there are things thinner than a scalpel blade. Some shim stock (side of a beer can?) or a feeler gauge cut into a small, sharp piece might work.

If it is not stuck too badly, it might be possible to glue the other end of the drill bit back onto the base with a tiny dot of super glue (cyanoacrylate) or epoxy--take care that there's not enough glue to ooze out and attach both parts to the chuck.

Worst case, you might have to use a Dremel-tool with a diamond burr bit and grind a hollow into the end of the bit to allow a wire to be wedged or glued into it as a handle to pull it out.

One way or anoher...good luck.

--Buckapound
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Old 12th September 2007, 12:32 PM   #4
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Maybe the slots are wide enough for a piece of .002" or so brass or stainless steel shim stock. Possibly take apart an old disk drive and salvage the ultra-powerful magnets, then use one of those to encourage the bit out. Tape around the front of the collet and use compressed air around the base of the slots to blow the bit out (aim carefully). Charge up a big low voltage capacitor and connect one end to the (closed!) collet. Connect the other end to a piece of steel wire. Touch the wire to the end of the bit, welding it there. Pull the wire, and the bit, out. Put the collet end of the tool in a strong ultrasonic cleaner- maybe it will fall out. Buy new tool!
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Old 12th September 2007, 12:55 PM   #5
OzMikeH is offline OzMikeH  Australia
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Quote:
Originally posted by Conrad Hoffman
Charge up a big low voltage capacitor and connect one end to the (closed!) collet. Connect the other end to a piece of steel wire. Touch the wire to the end of the bit, welding it there. Pull the wire, and the bit, out.
Brilliant!!
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Old 12th September 2007, 10:15 PM   #6
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Quote:
Originally posted by Conrad Hoffman
Touch the wire to the end of the bit, welding it there. Pull the wire, and the bit, out.
Sounds like an extreme version of the kids game "Operation". Don't touch the sides!
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Old 12th September 2007, 10:31 PM   #7
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This is kinda like measuring the height of a building with a barometer- how many ways can you do it?
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Old 13th September 2007, 12:33 AM   #8
OzMikeH is offline OzMikeH  Australia
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My favourite is dropping it off the side and timing how long it takes to hit the ground.

The capacitor and wire trick could be done more easily with some insulaton slipped over the wire.
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Old 13th September 2007, 04:32 AM   #9
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Thanks to u all

Gajanan Phadte
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Old 13th September 2007, 04:33 AM   #10
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Tade wrote
Quote:
The chuck isn't made out of aluminum with any luck is it?
No, it is steel.

Buckapound wrote
Quote:
If it is not stuck too badly, it might be possible to glue the other end of the drill bit back onto the base with a tiny dot of super glue (cyanoacrylate) or epoxy--take care that there's not enough glue to ooze out and attach both parts to the chuck.
I will try this

Conrad Hoffman wrote
Quote:
Maybe the slots are wide enough for a piece of .002" or so brass or stainless steel shim stock. Possibly take apart an old disk drive and salvage the ultra-powerful magnets, then use one of those to encourage the bit out. Tape around the front of the collet and use compressed air around the base of the slots to blow the bit out (aim carefully). Charge up a big low voltage capacitor and connect one end to the (closed!) collet. Connect the other end to a piece of steel wire. Touch the wire to the end of the bit, welding it there. Pull the wire, and the bit, out. Put the collet end of the tool in a strong ultrasonic cleaner- maybe it will fall out. Buy new tool!
The end of the bit remains behind the slots and the pushing becomes difficult.
The surrounding metal is also magnetic, I tried the magnet and the bit didn't budge.
Capacitor method is very good and I will give it a try. I will have to be careful not to weld the bit to the chuck in doing so.
This will be tried first.

Thanks to u all

Gajanan Phadte
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