On 15 Mar 2012 at 19:42, jthecman at netscape.net wrote: Cast iron's a b*tch to repair because it's brittle as glass. That's why, for instance a pipe cutter for cast iron plumbing simply applies point-pressure along a line and the pipe just breaks off. That's also why you can demolish a cast-iron bathtub using nothing more than a sledge hammer. I've heard of repairing cast-iron machinery by brazing, rather than welding (lower temperature), with the cast-iron workpiece pre-heated to minimize thermal stresses. You should probably stud the parts together to add some strength and just braze right over the studding. I've also heard of repairing a preheated cast-iron workpiece by using stainless filler wire in a MIG welder. There are (expensive) cast- iron welding rods for use in a normal arc welder, butt he results are often ugly and accompanied by workpiece cracking--and the joint is brittle and hard as glass (because of the high carbon content of cast iron). Whatever you do, don't have the work done by someone who's never worked with cast iron. It requires a careful touch; knowing what one is doing is vital. Good luck! --Chuck

On 3/15/12 6:42 PM, jthecman at netscape.net wrote: A though. A couple of points: If I were doing this the first question would be "Will you run the machine or is it for display?" The fact that three legs are broken suggests that if this is going to be a working exhibit, any repair is likely to fail unless it's reinforced. If it's going to see any serious use, I'd build a stand for it. If it's going to see serious use and you really want it original, have the base recast. Not Cheap. No offense to anyone, but ignore all the list-members' suggestions about fluxes, MIG, arc rod, etc. "Cast iron" covers a LOT of alloys, and by the time that unit was built it's probably actually cast steel. The welder doing the repair should be able to identify the metal and suggest the right process. Finally, ask around a bit if you're going to have the cast base repaired. If you want a structurally sound repair, you need someone with specialized skills. I was a welder for quite a few years in the '70s & '80s and I know just enough about cast-metal repair that I wouldn't touch this. A welder or blacksmith who specializes in cast work should have no trouble with it. Doc