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