"Pete C." wrote in message
ster.com...

MiamiCuse wrote:

I have a 3" cast iron vent pipe that I need to cut in order to rework
some
plumbing. I used a sawzall with a cast iron blade by Lenox and was able
to
cut through it after about 5 minutes. Unfortunately I did not start the
cut
evenly (it is a vertical pipe so I must have held it not perfectly
horizontally) and the cut was a bit slanted. I noticed it after the cut
was
half way but I have no choice but to continue and get through the cut.
Now
the high end is about 5/8" higher then the low end.

I plan to use a no hub coupling to join with a PVC pipe, and I do not
want
the gap to be more than 1/4" since I might one day need to snake the
line
and I don't want a cutting head to slide through the 5/8" space and end
up
cutting the no hub rubber sleeve even if I have a metal shield outside I
rather get the cast iron cut end to within 1/4".

I have two choices - to do a new cut and this time try to cut it evenly,
but
I am very close to a sanitary tee if I mis-cut again I will have to
replace
that too...or I can use an angle grinder to grind the edge even, but I
am
wondering can I really use a metal wheel to grind even a 3" CI pipe that
is
5/8" off?

Thanks in advance for any advise,

MC

Grind, probably not, but if you draw a reference line in chalk and use a
cutoff wheel in the angle grinder you should be able to do it.

I think this idea has merit. You might experiment with the chunk you cut
off, but I suspect that if you were to score the pipe you might even be able
to snap off the bit you want to discard.

You might use the cutoff wheel on the OD of the pipe scoring it to a depth
of aprox. 1/4 the thickness and then use a smaller dremel type cut off wheel
to score the inside. Scored in this manner, the pipe should crack along the
line. You might also make a few cuts to the line from the edge.

--

Roger Shoaf

About the time I had mastered getting the toothpaste back in the tube, then
they come up with this striped stuff.