Keyless chuck

Drowning it in WD40, leave to fester, then use gripping tools on either half to free it.

BUT THEN important to oil it. WD40 is NOT a lubricant.

Just my ha'pennyworth's

It happens that Lawrence Milbourn formulated :

Go around the perimeter of the chuck, tapping it with a mallet or similar.

There's a song about that:

Lightly hit the end (the outer ring) with hammer.

Hold the outer ring in a vice and turn the drill on (forward/drilling direction)

Oh yes it is.

Water can be used for a lubricant too. In this case I wouldn't recommend WD40 as a lubricant or indeed water.

Even the wiki article says, "WD-40 is the trademark name of a water-displacing spray".

Try to be a little more helpful.

Put a 10mm Allen key in the chuck, and lock the other end in a vice. Use water pump pliers or a mole grip on the outer and turn.

The original WD40 was indeed a water displacing spray (WD = water dispersant), but on the can to hand it states that it lubricates,

Quite, best choose one with the prime property of lubrication.

There was a tale saying it contained glass beads, which would lead to abrasion, but I was never convinced.

Use impact to loosen it.

On a conventional chuck you hit the end of the chuck key a sharp rotational blow with a hammer,

With a keyless chuck secure one section in a vice, grip the other with a mole grip, adjustable spanner, or similar made from malleable iron or steel such as it won't shatter and give this a sharp blow with a hammer.

With softer blows apparently much of any force applied is simply dissipated as friction.

Which doesn't happen if you take it by surprise with a short sharp shock.

michael adams

...

any I've ever had came in aerosol form & I go back to 1971 with it. How would glass beads get through an aerosol nozzle?

That sells product. It removes more lubricant than it replaces though.

NT

The WD40 brand in the past few years has been expanded to cover all sorts of oils and greases.

You try to be less ignorant.

I use it to stop my garden spades rusting. The residual oily film does just that. If water gets onto a sprayed surface, it goes into beads and rolls off due to the oil.

You can make your own WD40 by mixing diesel fuel with engine oil.

You try to be less ignorant.

I use it to stop my garden spades rusting. The residual oily film does just that. If water gets onto a sprayed surface, it goes into beads and rolls off due to the oil.

You can make your own WD40 by mixing diesel fuel with engine oil.

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Please give the quantities?

I always thought it was fish oil :)

Thanks for all the suggestions. I put all of them together and they worked!

Neither is it a penetrant!

Neither is it a penetrant!

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So, what is it used for?