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  1. #1
    clay27bsouthbend is offline Aluminum
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    Default 1018 or 4140 for crossfeed?

    In replacing my crossfeed lead screw. Do I want to use 1018 carbon steel or heat-treated 4140 alloy steel from McMaster Carr.
    Thanks Clay

  2. #2
    JC Sparks's Avatar
    JC Sparks is offline Aluminum
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    1045 is in the middle of those 2. I use it for shafting and it's pretty tuff. JC

  3. #3
    Paula's Avatar
    Paula is offline Titanium
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    Definitely avoid 1018, if for no other reason than machinability -- it's soft and gummy. I would use 1144 ("Stressproof") for the screw -- moderately hard in the annealed state, stable, and machines like a dream.

    Paula

  4. #4
    Finegrain is online now Titanium
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    +1 for 1144SP. Besides being free-machining, it has good wear properties. I did a new crossfeed screw for my Logan, complete with integral feed gear, out of 1144.

    Regards.

    Finegrain

  5. #5
    quasi is offline Stainless
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    if you are buying acme screw stock, get the 4140.

  6. #6
    clay27bsouthbend is offline Aluminum
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    Default skill?

    Thanks guys I don't have the tooling (threading gears or threading dial) and mainly the skill to make the threads. So i'm looking at buying the precision acme threaded rod from McMaster. I wasn't sure if the heat-treat 4140 could be turned down.
    Thanks all for the info Clay

  7. #7
    garyphansen is offline Titanium
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    PM Swells and see if he has any in stock. The Amce LH screw he provided me for my cross slide screw had a much better finish than I could get by turning the threads myself. Gary P. Hansen

  8. #8
    alg4884 is offline Cast Iron
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    Quote Originally Posted by clay27bsouthbend View Post
    ....I wasn't sure if the heat-treat 4140 could be turned down.
    4140HT, from the mill, is 28 to 32 Rc in hardness. You can machine it without any problem..... Even with HSS.

    alg4884

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