On Monday, November 11, 2019 at 9:07:25 PM UTC, Tim Lamb wrote:
In message , John
Rumm writes
On 11/11/2019 14:30, David wrote:
Having bought a hole saw and arbor from Screwfix and put them together in
what I think is the correct configuration I was frustrated by the fact
that the pilot drill was barely longer than the depth of the hole saw
which made it very difficult to align it with the mark for the centre of
the hole.
I located a screw on the side of the arbor and removed the drill to
check
the size and look for a longer one.
Turns out that the drill had 3 little notches in the shaft to allow
pre-
setting different drill lengths.
Who knew?
Still a bit of a fiddle to make sure the grub screw located properly
in
one of the three notches, but at least a variable length pilot drill.

Not all of them have the notches... you can also substitute the
supplied drill for a longer one if it helps. (I also realised you can
stick a long drill in it, and leave a bit poking out of the back, so
you can grab it with the chuck. Handy when the shank on the arbour is
12mm and you want to use it in a drill with a 10mm chuck).

I want a hole saw manufacturer to design a tool that doesn't require
considerable effort to extract the waste!

How about putting holes in the top so you could use a punch rather than
fiddling around with various screwdrivers.



--
Tim Lamb

https://www.youtube.com/watch?v=MlM3Ywu-6WA

Go to 1.16 to see tyhe feature you desire. Works good. We have one