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GRBL arc pauses.

Discussion in 'CNC Mills/Routers' started by Danni, Mar 19, 2021.

  1. Danni

    Danni New
    Builder

    Joined:
    Mar 19, 2021
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    Hi.

    I have a problem with arcs. I have searched after solutions but can't find a similar problem. It looks like it pauses short between each command in a arc. If it just moves diagonally all is normal.

    look at the video of the stepper drivers. The drives getting disabled and enabled many times. If i keep the drives enabled with $1 it still pauses movement.

    i tried to change:
    $0 step pulse
    $1 step idle delay
    $10 status report
    $11 junction deviation
    $12 arc tolerance

    Nothing helps. Can someone see anything that could be the problem??

    My setup:
    Arduino mega with ramps 1.4
    Grbl mega 5x build on Grbl v1.1f
    DQ542MA stepper drivers
    Stepper motors 57BYGH115-003B 3A setup in 1/8 step. Have tried 1/2 and 1/4 step
    36V 350W power supply.

    G-code generated in GrblGru:
    Code:
    ( Job: Rectangle 160.00 x 100.00  -> Cut 1 mm mit 3 Tabs )
    ( ------------------------------- )
    ( TransformationTyp = NONE )
    ( Clearance Plane = 5 )
    ( Sum of depth = 1.1 )
    ( Depth per path = 1.1 )
    ( Diving Ramp = 1 )
    ( Tab Ramp = 1 )
    ( Splitting size = 2 )
    ( Cut Feedrate = 1000 )
    ( Rapid Feedrate = 2000 )
    ( Plunge Feedrate = 500 )
    ( Type of Tool = SPINDLE )
    ( Tool = endmill 3.175mm )
    ( Tool diameter = 3.175 )
    
    
    
    G1 G90 F100
    
    ( Path 0 )
    ( ------------------------- )
    
    ( Current depth = -1.100 )
    
    ( MoveToStartpoint2 )
    F2000 G90 z5.000
    F2000 x10.000 y-1.588 z5.000
    F2000 x10.000 y-1.588 z0.000
    
    ( Loop )
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    ( Lift to 5.000 )
    F2000 z5.000
    
    ( Program end, back to origin )
    G90 F2000 z5.000
    
    ( Spindle off )
    M05
    F2000 x0.000 y0.000 z5.000
    

     
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

    Joined:
    Mar 1, 2017
    Messages:
    13,753
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    Keep the advanced Grbl Settings at Default values - those advanced settings have been tweaked over years, the defaults works great.

    There is no Arcs in the gcode. Its a bunch of G1 straight sections. You will need a proper CAM that does generate G2/3 arcs if you want to use Arcs, Fusion360 for example

    Line segments can work, if it stutters on them, its the changed grbl settings rather, or a slow PC/Software that cannot stream fast enough, or uses a Ping Pong buffer instead of the more efficient Character Counting method of streaming to grbl
     
    #2 Peter Van Der Walt, Mar 20, 2021
    Last edited: Mar 20, 2021
    David the swarfer and sharmstr like this.
  3. David the swarfer

    David the swarfer OpenBuilds Team
    Staff Member Moderator Builder Resident Builder

    Joined:
    Aug 6, 2013
    Messages:
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    GRBL will stop when the angle between one line and the next is too great to negotiate at speed, there is no parameter that can prevent this.
    Here are the slopes of your line segments, you can see that there are some big slope changes which will definitely make GRBL stop to change direction
    upload_2021-3-20_21-54-47.png
     

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