On May 3, 5:01�pm, "Don & Lucille" wrote:
Get a reciprocating blade desingen for cast iron!!"HeyBub" wrote in message

m...



MiamiCuse wrote:
I need to cut a 3" cast iron vent pipe to tie to a new PVC vent.

I am using a Milwaukee sawzall with a metal blade and it kept
skidding and wouldn't start the cut at the right place. �I then used
a 4-1/2" angle grinder with a metal blade and cut a little notch and
now I can engage with the sawzall without skidding.

However after 15 minutes of cut I don't think I am making a
significant dent at all.

I used the same sawzall and cut through copper and EMT electrical
conduits like knife through butter. �But this CI pipe I am not making
any progress.
I can't use the angle grinder there is simply not enough room around
it.
I went to HD and they recommended a "grit iron" blade. �Got that and
it seems to cut a little bit, but again after 15 minutes, I am not
even 10% through the pipe. �The way I am going it would take 10 hours.

I remember seeing another blade named "ugly metal blade" I wonder if
that would be better.

Is there a better way to do this?

I know a chain cutter may be used, but I want to avoid it. �Part of
the reason I am cutting this is because the lower section was cut by
a plumber who used a chain cutter but created a vertical crack line
and now I am trying to cut away all the damaged section.

If all else fails, try:

* Thermite
* Primacord- Hide quoted text -

- Show quoted text -

some is tougher than others because it may have been recycled stell
from something really tough.

scrap varies a lot depending on what the scrap came from.

cast engine blocks make tough drilling and cutting in their second life