Screwgun "Chuck" question...

**Batpig** · 4th December 2008, 09:42 PM

Dear Lads,

If any of you have got your Screwgun nearby, I wonder if you could quickly check something out for me...

When you push your Nut-Driver (for Roofing Guns) or Bit-Holder (for Drywall Guns) into your Screwgun's hexagonal socket (which is effectively the Chuck, for want of a better term), a little spring-loaded Locking-Ball inside the "Chuck" engages with the little narrow machined "Neck" towards the back-end of the Nut-Driver/Bit-Holder - correct... It sort of "clicks" a little when it happens.

Now, the question is: When this has occurred, is your Nut-Driver/Bit-Holder sitting fully at the bottom of the Chuck, or is it being held in an "aloft" position somewhat off the bottom of the Chuck?

You can find out by pushing very hard on the front of your Nut-Driver/Bit-Holder (hard enough to defeat the little spring-loaded Locking-Ball), and seeing whether or not the Nut-Driver/Bit-Holder suddenly pushes into the Chuck a few millimetres more (and I'm not talking about the "travel" in the spring-loaded Clutch...).

I'm asking the question because I'm trying to work out whether the "aloft" way of gripping the Nut-Driver/Bit-Holder (such as in my Screwgun, by a couple of millimetres above the bottom of the Chuck) is correct, or whether it should instead be sitting hard up against the bottom of the Chuck during driving...

The trouble with the "aloft" way is - if you push really hard during driving, you can end up defeating the little spring-loaded Locking-Ball and pushing the Nut-Driver/Bit-Holder in further, which throws out the accuracy of the Depth-Setting by the said couple of millimetres. Those couple of millimetres are enough to make "Mince-Meat" out of the little sealing-washers on Roofing Screws! (which I did with some test-screws whilst setting the depth this morning...

)

If it's a "Design Fault" in my gun (ie. it's the only model out there holding the Nut-Driver/Bit-Holder aloft above the bottom of the Chuck), I'll want to take the thing back while it's still under warranty...

Hope this makes sense!..

Many Thanks,
Batpig.

**Barry_White** · 4th December 2008, 11:01 PM

Hi Batpig

The bit should be pushed all the way home past the little click ball and then you set the nose cone on the screwdriver so that when the nose cone sets the screw at the right depth when the nose cone comes in contact with the surface of the material that is being fixed and then the clutch stops the screw from going any deeper.

e.g. with plaster board the bugle head screw sits just below the surface of the plaster board, or the SEH screw sits just below the surface of FC sheet or with roofing so that the screw is tightened enough so as not to squash the neoprene washer from under the screw head but is tightened just enough to seal the screw.

**Batpig** · 5th December 2008, 08:45 PM

Dear Barry,

Thanks for tuning in, "Mr Roof"

. The depth-setting nose-cone arrangement actually works pretty well. It's just that if you push really hard on the screw during driving (and thus on the Nut-Driver/Bit-Holder), the spring-loaded Locking-Ball in the Chuck can be defeated and ride up and out of the narrowed "Neck" in the Nut-Driver/Bit-Holder, allowing the Nut-Driver/Bit-Holder to slide further down into the Chuck by another couple of millimetres until the back of it hits the bottom of the Chuck (which throws the depth-setting out enough to squash the seals on a Roofing Screw...)

Would you happen to know whether your Nut-Driver/Bit-Holder can be pushed any further into the Chuck after the "click" if you push quite hard on it? (to the degree that the Locking-Ball must be riding up and back out of the Nut-Driver/Bit-Holder's "Neck"...)

Many Thanks,
Batpig.

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