John Rumm wrote:
On 23/05/2019 17:24, Mike Clarke wrote:
I'm having problems removing a chuck from an old B&D reversible hammer
drill. I'm using what I think is the same procedure I used many years
ago but the chuck refuses to unscrew.

First I removed the locking screw from down in the depths of the chuck,
remembering that it's a left hand thread then I gripped the short leg of
a large allen key in the jaws of the chuck and gave the long leg a sharp
tap with a hammer in an attempt to loosen the main right handed (I
think?) thread but it seems to be seized up and there's not enough
inertia in the motor to stop the shaft spinning round with the chuck.

I've squirted a dose of WD40 into the chuck and left the drill standing
chuck uppermost in the hope it will loosen the thread overnight. Is
there anything else worth trying if that doesn't work?

If its a 2 speed version, stick it in low gear.

I sometimes find simply putting the chuck key in the chuck and then
giving the end of that a sharp tap with a hammer is quite effective.
(there is a bit less spring in it than the alan key approach).


+1. A chuck key is much stiffer than an Allen key and will transmit a much
higher €œshock€� to the threads of the chuck when you whack it.

Tim



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