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Like in the picture. It's doing a great job (floorboards and skirting boards) but it keeps working itself out of the drill - I can see it creeping out gradually, and after about a minute of use it falls off. I've got the chuck as tight as I can get it.

It's actually worn away the spindle bit that goes in the drill, too, presumably it is constantly slipping inside the drill.

I'm using a very heavy duty sandpaper grade on it - 40 grit - for the first pass to take all the crap off. Could that be part of the problem?

Greatful for any advice.... cheers

  • your drill chuck is the real problem - see my answer. – Ken May 20 '17 at 16:13
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Your Drill Chuck is actually the problem here.

You can try a few different things.

  • Buy a new chuck for that drill.
  • Buy a new high quality drill.
  • Since your spindle is damaged already, you might want to put a groove in it for your chuck to bite into it.

I have no relation or affiliation with any of the following - I am supplying the links so you can see some different ways to get new chucks.

In No particular order of quality, usefulness or reputation; Links for Replacement Chucks Follow:

Toolots

Jacobs Chucks

At Amazon

Craftsman

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    One additional thought. Use less pressure when sanding. That's a big diameter drum and the sandpaper has a lot of friction. High sanding pressure involves some heavy forces on the spindle. – fixer1234 May 20 '17 at 22:26
  • Thanks ken. The drill is old and the chuck is quite stiff. I'd been thinking about getting an SDS drill for extra power and a non slip bit but haven't been able to work it into our limited household budget! – Max Williams May 21 '17 at 9:06
  • @fixer1234 I think there is too much torque like you say, I tried it with my battery drill/screwdriver, which has an auto cutoff and it kept stopping. I'll try it with a lighter grit and less pressure and more patience! Cheers – Max Williams May 21 '17 at 9:09
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    @MaxWilliams, bits like spade bits, which need a lot more torque than a regular drill bit, often don't have a round spindle. They have flatted sides for the chuck jaws to grab. That would be easy to replicate, and is likely to be enough. Try that before replacing the chuck. – fixer1234 May 21 '17 at 10:15
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    BTW the battery-powered drill/screwdriver has been doing a great job, not coming loose at all, though it churns through the battery like nobody's business. So i think the problem is with my old drill. – Max Williams May 23 '17 at 8:43

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