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Bit went further down the further out it went.

Discussion in 'CNC Mills/Routers' started by Brandyn, Dec 3, 2022.

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  1. Brandyn

    Brandyn New
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    I was doing a circle pocket 1/4" deep in 1" material using a 1/4" upcut, was cutting at a depth of .25, basically it was this round piece of pine, was putting a pocket in it, started the work from the center and I thought things were going alright when I was sitting at the back of the machine and well things got loud so I hit abort and discovered basically the further from the center it got it would be stepping down a bit deeper and eventually went all the way into my spoilboard that was when it got loud and I hit abort. What would be the cause of that? Too high of speed at too much of a depth? Also when I was trying to zero in my z my interface had a disconnect and drove into the wood a little till I had to hit the power button on blackbox so I don't know if that done something.
     
    #1 Brandyn, Dec 3, 2022
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Possible, what speeds and depths were you running at?


    A loose collet nut, or undersized tooling (6mm shaft in 1/4" collet for example) can pull out while the job is running, do check if the buit pulled out of the collet, or whether the Z axis itself dropped.

    If its the Z itself, also check mechanicals (loose setscrews on shaft coupler?) and also wiring (docs:blackbox-4x:faq-identify-motor-coils [OpenBuilds Documentation])

    Also make sure your Z axis Max Rate and Acceleration is tuned correctly so it doesn't stall during lifts at speed (Grbl v1.1 Configuration · gnea/grbl Wiki and Grbl v1.1 Configuration · gnea/grbl Wiki)
     
    #2 Peter Van Der Walt, Dec 3, 2022
  3. Brandyn

    Brandyn New
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    Was like 215/ipm at 1/4" depth
     
    #3 Brandyn, Dec 3, 2022
  4. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    Definitely on the aggressive side.
    DOC should be more like half tool diameter (so 1.8") and then lower feedrate as well. Start slower and work up to a comfortable level
     
    #4 Peter Van Der Walt, Dec 3, 2022
  5. Brandyn

    Brandyn New
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    Well I finally made it back out to my machine and sure enough it was the bit that slipped lower so guess I just slipped up and didn't get it tight enough that time.
     
    #5 Brandyn, Dec 3, 2022
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  6. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    That's a good catch then :) its one of those things you'd never think to check until you know about it. Happens to us all! Glad you found it
     
    #6 Peter Van Der Walt, Dec 3, 2022

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