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Thread: 1911 Slide Milling

  1. #1
    toy
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    Default 1911 Slide Milling

    Hi All,

    I am thinking of trying my hand at making a 1911 slide. I have a Slide Casting that I bought from Sarco. I believe that it is 4140 which is an oil hardening alloy. In my review of the prints, it looks like the slide is hardened, at least in spots, to 40 46 RC. I am trying to decided between heat treating before milling or heat treating after milling. I have a molten salt pot, and high temperature oven and can do the heat treating. However, I am sure that there will be some warping during the quench. So I am concerned that if I mill first and heat treat second, that I will mess up my milling tolerances. If I heat treat first, I am concerned that it will make it difficult to machine with HSS cutters. The other choice would be to spot harden in only the wear areas. Has anyone out there done this before? How did you handle the situation? Do most people just machine it and forget the heat treat?

    Thanks

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    Gunco Member maguire1984's Avatar
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    I've cut a 1911 slide both ways. Hardening after you have cut will change your tolerances slightly. I had to grind the rails back to a final fit. Heat treating before you cut just makes things 10 times harder. I used HSS endmills too so I know where you're at. I thought alot about how to heat treat for my 3rd time making a 1911 slide and actually sent it to a lab near boston that does cryo heat treating. I had the best result for my slide by cryotreating and it seems to have made little change in tolerances. It cost me an extra $30 or so and was worth it

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    Gunco Regular aceatm1nd's Avatar
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    maguire, would you mind PM'ing me the name of the company that did that for you? I might have one to send them, if I ever get my other projects out of the way.
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