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How can I mill down high speed steel?

Discussion in 'Off-Topic Discussion' started by soggyBottom, Dec 27, 2020.

  1. Dec 27, 2020 at 2:42 PM
    #1
    soggyBottom

    soggyBottom [OP] Well-Known Member

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    I found some high speed steel (hss) that is slightly too large for my needs. The rod is 4.2mm and I need approximately 4.15mm.

    It's going into some relatively soft plastic to it's not super critical that it's exactly 4.15mm. how can I mill it down? I don't have a lathe but I do have a drill press and sand paper. Would that even work or am I an idiot for considering it?

    https://www.amazon.com/dp/B082GVX4TM/ref=cm_sw_r_cp_apa_fabc_UUq6FbV56W0QV
     
    My Name is Rahl likes this.
  2. Dec 27, 2020 at 2:45 PM
    #2
    My Name is Rahl

    My Name is Rahl President of the Taco-Obsessed fanclub!

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    Why not drill out the plastic to the appropriate size?
     
  3. Dec 27, 2020 at 2:59 PM
    #3
    soggyBottom

    soggyBottom [OP] Well-Known Member

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    The plastic parts get replaced regularly. I'd prefer to not need to modify the plastic parts every time one gets replaced. I'll do it if there is no other option.
     
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  4. Dec 27, 2020 at 3:07 PM
    #4
    My Name is Rahl

    My Name is Rahl President of the Taco-Obsessed fanclub!

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    Then you'll have to find a local machine shop.
     
  5. Dec 27, 2020 at 3:13 PM
    #5
    RedWings44

    RedWings44 Well-Known Member

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    Sorry, back to your regularly scheduled thread.
     
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  6. Dec 27, 2020 at 3:15 PM
    #6
    My Name is Rahl

    My Name is Rahl President of the Taco-Obsessed fanclub!

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    :fistbump:
     
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  7. Dec 27, 2020 at 5:21 PM
    #7
    rtkbowhunter

    rtkbowhunter Well-Known Member

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    No access to a lathe, then set it aside spend $4.26 + shipping at McMaster and buy the size you need. You send it to a machine shop to knock .002" it's gonna cost way more than the price of material to size.


    https://www.mcmaster.com/8893K166-88645K51/
     
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  8. Dec 27, 2020 at 5:33 PM
    #8
    Key-Rei

    Key-Rei Well-Known Member

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    If the tolerance isn't super critical and the duty is for something personal then I personally would just do as you mentioned, sand paper in a drill press (carefully!) but you're taking about a .05mm tolerance that's pretty exacting...

    Either order to spec or get it machined if it's that specific.

    What is this rod's purpose?
     
  9. Dec 27, 2020 at 5:37 PM
    #9
    rtkbowhunter

    rtkbowhunter Well-Known Member

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    For reference .05mm is .002". If you turn it on a lathe you're only moving the cross tool holder .001". Kinda tight tolerance.

    Buy the rod to size from McMaster. Problem solved.
     
  10. Dec 28, 2020 at 3:46 AM
    #10
    soggyBottom

    soggyBottom [OP] Well-Known Member

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    I already looked and couldn't find the size on MC
     
  11. Dec 28, 2020 at 3:48 AM
    #11
    soggyBottom

    soggyBottom [OP] Well-Known Member

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    Hinge pins on an rc car
     
  12. Dec 28, 2020 at 3:54 AM
    #12
    six5crèéd

    six5crèéd ⑥ 。 ⑤

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    Where are you located?
     
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  13. Dec 28, 2020 at 4:11 AM
    #13
    Key-Rei

    Key-Rei Well-Known Member

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    For the A arms? if that's the case then yeah I wouldn't hesitate to chuck it up in a drill and sand it down till it fit. That said the A arms should be either injected ABS reinforced with fiberglass or similar and therefore relatively strong it probably wouldn't hurt them too much to drill them out either.
     
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  14. Dec 28, 2020 at 4:43 AM
    #14
    soggyBottom

    soggyBottom [OP] Well-Known Member

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  15. Dec 29, 2020 at 3:01 AM
    #15
    rtkbowhunter

    rtkbowhunter Well-Known Member

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    The size in the link is .164". That's 4.16mm.
     
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  16. Dec 31, 2020 at 8:03 PM
    #16
    vssman

    vssman Rocket Engineer

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    Think you could get away with a drill blank? #20 = .161 and #19 = .166. MC or Granger might have that size as a drill blank. If it’s short piece you need, you might be able to cut the shank off from the bit and use that.
     
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