On Oct 1, 11:32*am, dpb wrote:
On 10/1/2012 10:01 AM, DerbyDad03 wrote:
...

Actually, I don't have a hole saw arbor. The very few round holes I've
needed to cut have always been small enough that no arbor was needed.
However, a friend has a hole saw kit that goes up to 3 1/2". Maybe I
could use his arbor and just buy the 4" holesaw. Are arbors brand-
specific or generic?

...

That haven't ever had need for holesaw seems most unusual but guess
everybody has done different stuff...

Anyway, the inexpensive arbors are standard w/ some exceptions--in all
likelihood his will work.

One thing since apparently you've not used one before--a large diameter
holesaw can exert a _LOT_ of torque and on a ladder it's going to be
pretty spooky as well...whatever you do, be prepared to let go; don't
even think of locking the power level...

Drill a few practice holes on the ground first (and trying one overhead
wouldn't be a bad idea, either) to get a feel; you may change your mind
and go back to the holes and keyhole saw after you do...

--

I guess I should have said what I said differently. I've used large
hole saws before, but I've always been able to use someone else's.
I've not needed them often enough to buy one. In this instance, we
have to get the job done tonight and I have not been able to put my
hands on anything larger then 3 1/2" with such short notice.

Anyway, I just picked up the $15 set at HF for $12.