Starting from the ambition to improve my baseboard flatness, I started by measuring it. I developped an automatic google sheet to generate the GRBL program to scan it along a X / Y grid and to process the output from console. If you want to use it, you can access it ans copy it for your use : Program GBRL Check baseboard To run it, I use a "trailing" probe pad : adhesive tape from the spindle. https://openbuilds.com/attachments/...0/?temp_hash=06e696b38c35f27b7691a65755925efa The result that I found seems to show more an insufficient stiffness of my single X axis lead 1515 with a 3.2kg 1500W water cooled spindle. There is about 3mm of variation between corners and center. Have you observed similar values or is it common on this kind of setup ? I am not sure that machining my base board will not work since the vertical force on the tool will depend of the machining parameters. https://openbuilds.com/attachments/...9/?temp_hash=06e696b38c35f27b7691a65755925efa If you have any comment or suggestion you are welcome !
If the gantry is sagging by 3mm, and I don't see any obvious problems with the methodology, cutting it flat is more like dishing it, which is going to be impossible to clamp to and get solid contact beyond a small fraction of a millimetre, The only solutions are to rigidify the gantry (hopefully without too much weight) or lighten the carriage/spindle (if it's making a gantry sag by 3mm, the gantry probably doesn't have the capacity to take 1500W of cutting power anyway). This would include the Z axis motor, rails, etc. There may be a happy medium of both. Of course if you're palletizing arrays and each part is, say, less than 4" square... Would it matter? Maybe not.
Thanks for your answers. I did additionnal measurement by adding 1kg weight on the spindle. Result approximately 0.1mm vertical mouvement, in mahority due to x axis stuffbess but we see also other effects (not fully consistent). So that lead possibly out of the 3.5 mm observed on the measurement to 0.5mm/0.7mm due to lack of stiffness. Surfacing or compensating the base board will help in fact.
Very nice. That sounds plausible by my experience with 1500mm C-Beam. Doing this stuff without defined planes can be difficult, probably requires a laser-based solution. Though a base board that's out by that much sounds... Odd. Is the subframe good?
Well.... I need to plea guilty. The baseboard is in fact assembled (2 pieces) and glued to make a sigle 140x150 out of a panel 125x250. I might have a triangle shape distortion. I ll remove the baseboard and measure the subframe (classical 40x20 2 // X axis & 3 // Y axis) to be sure I don't have an issue on it.
