Forget the rotozip. The bit will last about a half inch. The best I've
done is with a saber saw and fine cutting metal blades. Figure on about one
blade per outlet hole. Drill a 1/2" hole at each corner, then cut between
the holes. Figure on a new paddle bit about every 15 holes. I just
finished completely rewiring a hundred year old two story, and have many
many smooth blades and worthless paddle bits to show. G Another option I
haven't tried is perhaps a dremel type tool with about a 2" diameter blade
on the end of it.

--
Steve Barker




"BETAC-T" wrote in message
. ..
I have an old house with wood lath and plaster walls, and I need to cut out
a lot holes in the walls for light switches, electrical outlet receptacles,
etc.

Here is what I am doing now, and here is what the problem is:

I am just cutting them out by hand, one-by-one, using hand-held wallboard
saws, etc. The problem is that it is hard to keep the underlying wood
lath from vibrating and causing a wider area of plaster to crack and break
out. I have tried making sure each hole is adjacent to one of the studs so
at least one side of the hole has wood lath that is nailed down to the
adjacent stud. And, I have tried being very careful, cutting out a
little, reaching in to hold the rest of the wood lath stable, and then
carefully cutting the wood lath. But it is still a mess, doesn't work
very well, and takes a long time for each hole.

I don't think using any kind of powered reciprocating saw or saws-all
would help and probably would only make the lath vibrate more and damage a
wider area of plaster than using the by-hand method.

The problem seems to be the reciprocating action of the saws, so I keep
thinking there ought to be some kind of small circular saw that could be
used and plunged into the wall to cut the lath without vibrating it back
and forth. But I don't have, and haven't seen, a circular-type saw that
would be small enough to do this.

I have thought about buying one of those drill bits that supposedly can
saw sideways to cut holes in walls (which I saw on TV), but I haven't
found anything like that in any stores and I have a hunch they don't work
anyway (which is probably why they are only on TV).

So what the heck do professional electricians do? I keep thinking they
must have a tool or know of a trick to make this easy, especially since
they don't want to damage their customers' walls when putting in new
outlets, etc.

Any ideas? Thanks.