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Multipass plunge groove

Discussion in 'Troubleshooting and Build Support' started by TigerPilot, Aug 10, 2011.

  1. TigerPilot

    TigerPilot Well-Known Member

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    Using the multipass to cut wood I have a groove down the material where the cutting bit plunges down and only there. The whole part is perfect but where it comes down, step by step, it leaves a groove. Any idea how I can get it to not do it?
     
    TigerPilot, Aug 10, 2011
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  2. 3DMON

    3DMON Moderator Staff Member

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    That is probably caused by bit runout.
     
    3DMON, Aug 10, 2011
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  3. TigerPilot

    TigerPilot Well-Known Member

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    In that case it's not the bit itself but the spindle, I never liked the bearings in it (I've mentioned before that the get extremely hot) but I kind of doubt it. If it is bit runout, shouldn't it be random and not precisely at the same spot all the time? :questions:
     
    TigerPilot, Aug 11, 2011
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  4. 3DMON

    3DMON Moderator Staff Member

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    It would show up the most with plunges. If you want better precision I would go with a trim router with a good collet.
     
    3DMON, Aug 11, 2011
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  5. TigerPilot

    TigerPilot Well-Known Member

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    I hear yeah!!! :doubleup:
     
    TigerPilot, Aug 11, 2011
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  6. rjarois

    rjarois Moderator Staff Member

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    Yoram, when the tool plunges, its not a regular cut, rather its a very extreme cut were the chips really have nowhere to go.....and this makes the tool will run-out like Shaun says...even real expensive machines will do that were i work, its just a physics of the kind of cut it is....take smaller plunge and slower z-plunges will help. or hog out with a 3/32 tool, and then finish with a 1/8 will minimise this condition. remember what seems like rigid carbide tools flex like noodles...its the eternal machinist fight...that will never be won....tool pressure always wins, lols. figuring out how to minimise it is key...peace, randy.
     
    rjarois, Aug 12, 2011
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  7. TigerPilot

    TigerPilot Well-Known Member

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    Thanks, Randy, that will explain it. I'll have to decide it I can live with it or if I want to make a finish cut to remove the groove. Maybe, if we are lucky and a new ruby programmer comes to our midst. a finish cut feature will be added to the SUCam.
     
    TigerPilot, Aug 13, 2011
    #7

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