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IndustryArena Forum > MetalWorking > MetalWork Discussion > Dorian Cut knurl making a twisted Knurl
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  1. #1
    Join Date
    Apr 2019
    Posts
    1

    Dorian Cut knurl making a twisted Knurl

    Looking for some knurling experts advice.

    -Dorian Cut Knurl in CNC lathe with 20TP wheels
    -Knurling 3/4ish OD aluminum with .05" wall thickness approx 7" long
    -Part is supported by live center

    Knurl is coming out great but I am getting a twisted knurl. I've attached photo.

    Things I've tried: using the Dorian calculator to get a preferred pre knurl OD and knurl depth
    Set knurl on center to the best of my ability (both wheels make even contact)
    Knurl twists in one direction consistently no matter what I do. If i reverse the rotation of the spindle, the knurl twists in the other direction. Extremely consistent twist, changing pre knurl OD changes nothing.

    Thinking maybe some other issue.
    I have not tried knurling a solid bar yet. Maybe the thin wall thickness is causing the part to flex/move around while knurling?
    Attached Thumbnails Attached Thumbnails 20241206_121214.jpg  

  2. #2
    Join Date
    May 2017
    Posts
    63

    Re: Dorian Cut knurl making a twisted Knurl

    Those Cut Knurls you have are awesome! I'm thinking the same thing as you: the .050" wall thickness isn't enough rigidity for your 7" long part, even with a Center. I would try knurling from solid (still center it) and then drill the thru hole after knurl. A Cut Knurl is a lot less pressure than a Form Knurl but it is still a lot of tool pressure at 20 TPI.

    You can also double check your speeds/feeds:
    SFM: 230
    IPR: .003"-.010" (Start at .005")

    Hopefully this helps!

    Mike
    www.toolhit.com

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