On Nov 6, 10:21*am, "Existential Angst" wrote:
I've got the "hub" part of a cast iron drain pipe accessible in a floor
drain, and need to notch the lip, for the outlet of one of those
li'l-giant-type centrifugal pumps that I want to drop in. *The side outlet
of the pump sticks out past the diameter of the pump, ergo the need for a
notch, since it's a tight cylindrical fit. *The notch needs to be about 1-2"
long, mebbe 3/4" wide. *Best way to cut?

Regular metal cutting (sawzall), I think, are almost out of the question, as
I've tried this on other CI drain pipe -- pert near impossible, without one
of those coke-bottle cutting grit blades, which I didn't have.. *I had to
rent one of those "splitters", and even that was difficult.

Would an abrasive sawzall blade do the job efficiently? *Are there diff..
types of sawzall abrasive blades?
Woud I be better off grinding it out, with a 4.5" grinder, I spose.

O/A seems to be a poor method, according tohttp://www.practicalmachinist.com/vb/fabrication-cnc-laser-waterjet-p...

The reason being left-over graphite? *Somewhere in hehttp://en.wikipedia.org/wiki/Oxy-fue...ng_and_cutting

Plasma, air-arc seem to be OK, but, no gots.

Idears?
--
EA

Thin-wall castings tend to have a lot of chill, making them hard to
drill/saw. You could try drilling small holes around the notch
periphery, then using an angle grinder and a thin cutting wheel to
slice the chunk out. If you can't drill, then the angle grinder is
about it. I had some wheels about .040" called Razorblades, really
cut steel fast. I'd be a little reluctant to do any hammering or
chiseling on drain pipe. Won't be a job you'll get done in 10
minutes, that's for sure.

Stan