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Boring Head Arbor: 1018 Or 4140 Or Other?

Discussion in 'QUESTIONS & ANSWERS (Get Help Fast Here!)' started by Uglydog, Oct 29, 2016.

  1. Uglydog

    Uglydog United States Active User H-M Supporter-Premium

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    I've had a Criterion DBL204 without an arbor.
    I've got a project where I'll need the reach and rigidity of the 204 so I thought I'd finally get the arbor made.
    Am planning on a 1inch arbor and the requisite 1.5"x18 threads.

    I've got 2inch 4140 and 1018 on the shelf.
    I'm thinking I should make her out of 4140 about .999 and heat/quench and temper.
    Any strong recommendations for an alternative?

    Thoughts?
    Concerns?
    Recommendations?

    Thank you for any/all suggestions.
    Daryl
    MN
     
  2. Bob Korves

    Bob Korves H-M Supporter - Premium Content H-M Supporter-Premium

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    Hi Daryl,
    It might warp a bit when you heat treat it, so it might be worth leaving extra stock for grinding it to size after hardening and tempering. Actually, a boring head arbor does not need extreme radial accuracy, or hardness for that matter. A 1" shank of unhardened 4140 should support the boring head through everything but a major crash, only real downside would be more wear on the 1" shaft.
     
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  3. george wilson

    george wilson United States Global Moderator Staff Member H-M Supporter-Premium

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    I agree with Bob about the 4140. I never harden R8 shanks that I make. I keep a few old truck axles around for making good,strong arbors and shanks. Axles are hardened only where they run as bearings or through bearings. The rest is readibly machinable. But definitely superior to mild steel.
     
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  4. rgray

    rgray Active User H-M Supporter-Premium

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    That's a big arbor and probably is just fine raw. But...nothing like a hardened tool, so if you have the ability I would heat treat and temper just so it looked cool.
    Grinding after heat treat as Bob said would be great to if that is an option.
     
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  5. Uglydog

    Uglydog United States Active User H-M Supporter-Premium

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    All,
    Thanks for the feedback!
    My oven would easily do it, but I don't have a grinder.
    I've got a couple grinders available to borrow, but no cylindricals.

    I'll run with the raw 4140.

    Daryl
    MN
     
  6. george wilson

    george wilson United States Global Moderator Staff Member H-M Supporter-Premium

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    i have everything necessary to heat treat and grind tool steel arbors. but,i don't bother with large ones as it just isn't necessary.

    typed with one hand while eating a sandwich. hence no caps.
     
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  7. Uglydog

    Uglydog United States Active User H-M Supporter-Premium

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    I am sincerely responding that once again you speak with the voice of wisdom as evidenced by you not putting down the sandwich.

    Daryl
    MN
     
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  8. scwhite

    scwhite United States Active Member Active Member

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    4140
     

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