- Joined
- Jun 7, 2013
- Messages
- 10,452
I have done considerable casting of aluminum, brass and bronze; the former two are pretty easy; best to buy a pyrometer to determine when pouring temp is reached; with aluminum, do not use old pistons for metal, they are cast in steel molds and have an iron content in the metal to prevent the pistons from sticking to the molds, this iron content narrows the solidification range of the metal, so if you pour it at a temp high enough to not freeze up in the gating or thin sections in the casting, the result is excessive shrink in heavier sections and possible cracking.Nice lathe , you sure didn't get a bad deal. It's a beauty of a machine. The castings look to be done really well. One thing I never got into accept for another few tons of lead is casting iron or brass . I'm sure I could learn but not gonna. Ill be happy to get in the shop.
Nice machine I have a planer waiting to be fixed up and a little restoration to it. Overhead line shaft for her too. It's really in great shape just been dust collecting for twenty years.
Send more pictures of your builds of the steady rest and more. Nice lathe don't know of to many of them around.
Casting in bronze takes a lot of care compared to brass, and alloy of copper and zinc; the zinc has vapor pressure that prevents furnace gasses form the melt, which would create porosity, this does happen in bronze, an alloy of copper and tin; the furnace gasses are absorbed by the melt, and the resulting porosity can be awful. This can be prevented by the use of the oxidizing/deoxidizing treatment, where an oxidizing flux scavenges the gasses out of the molten metal, and just before it is to be poured, a deoxidizer is plunged into the metal, removing the oxides.
If bronze is cast, after the degassing is done, and the slag is removed, the metal should be shiny bright, if not, don't pour it.
I like the looks of your planer, I used to have one that was 20 X 20 X about 4ft stroke. I like planers, when I was employed where I apprenticed, they had one 6ft X 6ft X 16ft, which I ran quite a lot, it was a Cincinnati, probably built rather near WW-1, driven by a 35 HP D.C. motor with variable speed in both directions. For the most part, a planer is a real "gravy" machine; lots of sit down time for most work performed.
Unfortunately, when I do projects like the lathe parts, I am more focused on getting the job done, and not taking pictures; at the same time I was doing a bunch of other pattern and machine work on a bunch of parts for a steam donkey at Sturgeon's Mill near here, where I volunteer; there were literally hundreds of lbs of iron castings.