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I run a small repair shop (Lathe, Drill-Mill, Press, grinders, welding, etc.) to make parts and to service and repair Dairy Homogenizes. The only material I use is Stainless Steel (316 & 304 usually). I know very little about the 'stock' material that a lot of the parts/tools listed in this forum are made of:headscratch:
Think of stock as stuff you have on hand. How suitable yours stock is for a specific project depends upon that actual stock. Often the material is "mystery steel" to the author, that is he has no idea what he used to create his project.
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But! Seeing some of the members designs I see a lot of stuff that can help me in my shop - Tool-Past Grinders, Mechanic's Jacks, etc. But I don't know What materiel to use (they say 'a piece of stock'). What the hell is a piece of stock? It's obviously a piece of some sort of steel that they had laying around.
Well this is a learning process, eventually you will get a handle on the various alloys used in the machine shop. I like to think of stock as three major variants, they would be Cold Rolled, Hot Rolled and special steels. Within those groups there are a number of recipes yielding specific features.