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Cnc start does not look good

Discussion in 'CNC Mills/Routers' started by Cncstar, Jun 7, 2017.

  1. Cncstar

    Cncstar New

    Jun 7, 2017
    Likes Received:
  2. Gary Caruso

    Gary Caruso OpenBuilds Team
    Staff Member Moderator Builder

    May 19, 2016
    Likes Received:
    Need more info to help, what machine do you have, what programs you using, material, bit size type, feed, speed, depth of cut (DOC)...
    Just based on the pic and a guess, you have too aggressive of a plunge into the material and this is causing the bit to chatter out and enlarge the hole..
    but without knowing anything else this is just a guess. If you have a belt drive system maybe the belts are not tight enough. or your Z has too much flex (reduce the DOC)
  3. David the swarfer

    David the swarfer OpenBuilds Team
    Staff Member Moderator Builder

    Aug 6, 2013
    Likes Received:
    If you are using SketchUcam, turn on ramping.
    Same in any other software, ramp into the work instead of plunging.
    Milling bits are very bad at plunging, yes, even end cutting bits.

    I think Gary is right, your plunge (+ some looseness somewhere) is causing this.

    Is the bit center cutting?
    How fast are you plunging?
    What software are you using?
    What machine is it?
    Belt drive? are they tight enough?
    Screw drive? antibacklash nuts adjusted properly?
    What spindle? has it got runout? loose bearings?

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