Mesh Grid Compensation Graphic - Flatness Quality?



  • @All,

    Got a few questions regarding the 'Auto Cal' functions of the Webware-Console...

    In the 'Auto Delta Calibration' button DLB (Dropdown List Box), these selection items are offered, but I'm not too sure how they all work or what functionality are performed?

    Item 1, 'Show Probed Points', what does this do? In my system, this selection is always greyed-out unavailable.

    Item 2, 'Disable Bed Compensation'? Aside from disabling bed compensation, of why would that be done, but what does it affect? When is bed compensation applied or how is it stored and where does 'it' get generated?

    Item 3, 'Run Mesh Grid Compensation'...? Is that a different function from 'auto bed compensation'? When that sequence is run, where do those measurements get used aside from a visual aid (via the grid-graph)? How or when are those measurements useful? What do those measurements do? I run the auto-bed compensation and then the mesh grid compensation, are these just the same side of the coin but with more touch points?

    Item 4, 'Show Mesh Grid Height Map' which depicts a grid & subsequent graphic (which seems useful in terms of visually revealing measured bed countour or 'flatness', but again, is this the actual raw, uncooked bed contour height-points or is it the result after the calibration measurement process? If not the cooked version, is there a way to depict a corrected resulting bed contour? ...What does it do?

    Item 5, 'Load Height Map from SD Card'?? Which measurement does this load, the 'Auto Bed Calibration' or the 'Mesh Grid Compensation' measurements?

    Item 6, 'Disable Mesh Grid Compensation', obviously, it seems, that these measurements are stored (somehow) someplace. I notice that there is a file generated when I run the Grid Mesh Compensation sequence in the uSD card /sys directory, which depicts the number of (my) selected probe points. Are these the actual bed measurements or the correction values?

    I appreciate y'all's patience with these questions.

    Thanks in advance

    3mm
    ps, I've attached a few of the Grid Mesh graphics, measuring an aluminum heat-bed and while it doesn't appear to be too flat or linear it seems that it might be acceptable. The question are these measurements good...or...bad?

    0_1526772625331_05-19-2018_14-32_side_btm.jpg
    0_1526772666838_05-19-2018_14-32_side_top.jpg
    0_1526772705783_05-19-2018_14-32_top.jpg


  • administrators

    The auto delta calibration button sends G31 which in turn runs bed.g. When calibration completes, DWC displays a height map based on the errors before calibration adjustments have been made. So it's only accurate when calibration has converged.

    The run mesh bed compensation button runs G29, which generates a bed height map and saves it to file heightmap.csv as well as activating it. DWC then loads and displays heightmap.csv.

    The other buttons run G29 S1 (load height map from heightmap.csv), G29 S2 (clear height map, but the heightmap.csv file remains untouched). The display height map button displays heightmap.csv.

    HTH David



  • Hi, thanks for your cogent answers...

    @dc42 said in Mesh Grid Compensation Graphic - Flatness Quality?:

    DWC displays a height map based on the errors before calibration adjustments have been made. So it's only accurate when calibration has converged.

    When I run the auto-cal, (I presume that it completes?, as there are no error emits) the DWC does not display a height-map. So does that mean that the calibration process is not completing, or am I stupid? (hee hee, I've pulled a few boners in my career)

    3mm


  • administrators

    @3mm said in Mesh Grid Compensation Graphic - Flatness Quality?:

    When I run the auto-cal, (I presume that it completes?, as there are no error emits) the DWC does not display a height-map. So does that mean that the calibration process is not completing, or am I stupid? (hee hee, I've pulled a few boners in my career)

    Check the GCode Console page after the bed probing completes, it will tell you whether calibration succeeded or not.



  • @dc42

    Hi,

    Here's the DWC G-Console msg after 'Auto Delta Calibration' button push:
    3:42:55 AM
    G32 - Calibrated 9 factors using 17 points, deviation before 2.670 after 0.026

    =====
    But no height graph

    thanks...3mm



  • The hight map is only generated after a Mesh bed run on a Delta and I would do a 6 or 8 factor calibration and not 9 if you know the length of your Diagonal rods



  • Ok..thanks

    3mm


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