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  1. #1
    Join Date
    Jun 2017
    Posts
    369

    Weird surface on profile cuts

    Attachment 417532

    I just noticed this occurring on a job I just finished. I routed a total of 6 signs all had this type of finish on the edges.

    Material is kiln dried Maple.

    Bit is a new Onsrud 40-112 1/4" downcut

    Any help is greatly appreciated
    Gary

  2. #2
    Join Date
    Jan 2015
    Posts
    194

    Re: Weird surface on profile cuts

    This is what the Separate Last Pass (offset) features in Vcarve and Aspire is meant to address. Usually on one of the sides of the Baltic Birch plywood I was cutting, I’d get a rougher cut and I’m sure it was due to the grain of the layers. So I added a separate .02” last pass with a depth of about .05” (modifying the pass depth so the first 2 passes went near full depth on the 3/4” plywood). Since adding this, all my cuts have been accurate and clean. You could also play around with which way you are cutting, climb vs conventional, as that could also impact cut quality.

    Edit - I was looking for the Vectric manual but I at least found this, which shows a picture of the feature.
    Vectric Forum • View topic - separate last pass

  3. #3
    Join Date
    Mar 2003
    Posts
    35538

    Re: Weird surface on profile cuts

    You're getting deflection somewhere.
    I make a single full depth finish pass of about .02", at about 150ipm.

    I'd also recommend using a 3/8" bit, whenever possible.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

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