In article ews.net,
Doctor Drivel wrote:
The impact mechanism goes round in circles, behind the drill
bit :-)

So it moves the drill bit in and out? Rather than moving the chuck in
and out?

And just how do you think this could be achieved since the chuck grips the
drill bit tightly?

How does it compare to an SDS?

SDS drill bits are driven by flutes for just that reason that they can be
'hammered' without having to move the extra weight of the chuck.

--
*What happens if you get scared half to death twice? *

Dave Plowman London SW
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