![]() You can make your program allow for that by adding some extra steps when the direction changes - as long as the backlash is consistent. Set the 'custom size' units to mm Set the 'scale' to 1 (since the 'user units' are in mm, 1mm1mm) Draw a rectangle, set the units to 100mm x 100mm File > Save a Copy > '100mmRect.dxf' Don't use Robo-master Do use LWPOLYLINE Base Unit 'mm' (as this is the unit everything else is in) File > Import > '100mmRect. I wouldn't worry too much about backlash. Making a robust machine that can handle the heavy loads for metal cutting would be a major task. I had started adding a sensor to detect the position of the chuck so as to synchronize the feed for screw cutting - but like a lot of my things the need evaporated before I got that finished It seems to work properly but I have actually used it very little. And I wrote a Python program for my PC to allow manual control and to interpret simple GCode and convert it to numbers of steps for the motors (actually the total time for a move and the time between steps for each motor) which it sends to the Arduino. ![]() I wrote a simple Arduino program to control them. I added 3 stepper motors (X, Y and Z axes) to a small lathe (Sieg C1). I reckon it would help if you explain the sort of tasks you want your CNC to do. I had a problem with the SVG files from a newer version of LibreOffice. the file that was just imported, it changes the rulers instead of being 200. 2) Open file in Inkscape 0.91, comes in as 200 px wide (60 mm) 3) If I change the default units in Document Properties, it doesnt change. I do my 2D drawing with LibreOffice 4.3 Draw which I think is better than InkScape and which can export SVG files that Inkscape can use. 1) Make drawing in OpenSCAD 200 wide, save as. ![]() I know nothing about SolidWorks and I have never put in the time to learn proper 2D Cad, never mind 3D. but i have not found a way to generate GRBL code from there. Its a lot like paper plotting, you have to tell the plotter what a unit is equal to in order to get a 1:1 plot. Its up to the software to interpret the single DXF unit as in, mm, etc.So in your old software 6 generic units are labeled and treated as inch, but are in fact generic units. I have an old version of SolidWorks that was given to me due to it being outdated. DXF was created to be unitless, like DWG.
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