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Engraving: Each letter cuts deeper than the previous: Solved

Discussion in 'CNC Mills/Routers' started by MrCalm, Mar 27, 2018.

  1. MrCalm

    MrCalm Well-Known
    Builder

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    Any Help will be greatly appreciated!
    My machine is a new build and thought everything was working fine, but....
    Trying to engrave and each letter cuts deeper than the previous one.
    Smoothieboard with DQ542
    Fusion 360 > Bcnc
    20180325_111848.jpg

    I slowed down the retract and feed to a crawl and this is what I came up with(top example of the two)
    20180327_180854.jpg

    Did not help. The lower one I did but not as slow as the upper one. It was supposed to cut an ellipse around "MacKenzie" at -2mm really it is about -5mm.

    I am a total cherry to this CNC stuff and any suggestions or tips will be greatly appreciated!
    Thanks
     
  2. Giarc

    Giarc Master
    Moderator Builder

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    Is your cutting surface flat? I assume it is, but if not it can make some letters get cut deeper as it moves towards the elevated portion. Another thought is that your Z may be dropping if it is unpowered. I had a similar issue as you. Your choices in your settings for $3 Power management mode are 0=motor disabled, 1=motor always on, 2=motor on when in cycle, 3=motor on only when moving. Mine was set to 0 and it would progressively drop as it cut long profile cuts due to the weight of the router. I changed it to 2 and I have not had an issue since.
     
  3. MrCalm

    MrCalm Well-Known
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    Thanks for the reply.
    My workpiece is flat. I have checked and rechecked that. But I will check your suggestion with regards to the motors
    Thank you for the input
     
  4. MrCalm

    MrCalm Well-Known
    Builder

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    Totally a rookie mistake. The upper z leadscrew lock color loosened just enough that the bearing came out of it's seat in the upper plate. Reseated the bearing and it works great again.
    20180331_150106.jpg

    This pic is after I put the bearing back in its block seat. Total newbie mistake. Only took two weekends to figure out.
     
    GrayUK likes this.

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