snowman
Diamond
- Joined
- Jul 31, 2004
- Location
- Southeast Michigan
Estimating A2/M2 distortion during heat treat
I am machining two shafts, 2" diameter, 6" length. On each end of the shaft, it will be turned down to 1.5" diameter for 1" length. All corners will be rounded to reduce stress.
If the shafts go in to the furnace at 2" +/- .001, what kind of tolerances should I expect coming out? Both surfaces are bearing surfaces and the whole project will be turned between centers. Should I plan on having to grind in order to bring it back to my tolerances?
Also, the parts will be wrapped in heat treat foil. Do I have to take the parts out of the foil for the air quench, or is it better that they be left in to reduce surface oxidation?
Addendum...I just found that I can get a 24 lb drop of M2 for $50. Since I am always motivated by money, how much worse is M2 to work with? It is given as a 50% machineability in relation to W grade steels, but since I don't do a lot of tool steel work, I'm not overly sure what that means.
I am machining two shafts, 2" diameter, 6" length. On each end of the shaft, it will be turned down to 1.5" diameter for 1" length. All corners will be rounded to reduce stress.
If the shafts go in to the furnace at 2" +/- .001, what kind of tolerances should I expect coming out? Both surfaces are bearing surfaces and the whole project will be turned between centers. Should I plan on having to grind in order to bring it back to my tolerances?
Also, the parts will be wrapped in heat treat foil. Do I have to take the parts out of the foil for the air quench, or is it better that they be left in to reduce surface oxidation?
Addendum...I just found that I can get a 24 lb drop of M2 for $50. Since I am always motivated by money, how much worse is M2 to work with? It is given as a 50% machineability in relation to W grade steels, but since I don't do a lot of tool steel work, I'm not overly sure what that means.