Hi I generated some GCODE in Sketchucam and on running it one section seems to continually lift the cutter clear of the workpiece and go back down almost immediately. It's cutting an arc at the time and instead of one smooth movement it seems to be almost pecking at it. Here is a small section of the generated code in question. G00 Z0.5 G01 Z-0.5 F250 X36.1 Y37.94 F2540 G00 Z10.0 X33.611 Y40.955 G00 Z0.5 G01 Z-0.5 F250 X34.811 Y39.411 F2540 G00 Z10.0 X32.502 Y42.566 G00 Z0.5 G01 Z-0.5 F250 X33.611 Y40.955 F2540 G00 Z10.0 X31.49 Y44.24 G00 Z0.5 G01 Z-0.5 F250 X32.502 Y42.566 F2540 G00 Z10.0 X30.577 Y45.969 G00 Z0.5 G01 Z-0.5 F250 X31.49 Y44.24 F2540 G00 Z10.0 X29.767 Y47.749 G00 Z0.5 G01 Z-0.5 F250 X30.577 Y45.969 F2540 G00 Z10.0 X29.062 Y49.574 G00 Z0.5 G01 Z-0.5 F250 X29.767 Y47.749 F2540 G00 Z10.0 X28.465 Y51.436 G00 Z0.5 G01 Z-0.5 F250 X29.062 Y49.574 F2540 G00 Z10.0 X27.977 Y53.33 G00 Z0.5 G01 Z-0.5 F250 X28.465 Y51.436 F2540 G00 Z10.0 X27.601 Y55.249 G00 Z0.5 G01 Z-0.5 F250 X27.977 Y53.33 F2540 G00 Z10.0 X27.103 Y56.406 G00 Z0.5 I'm assuming it's the continual G00 code that's lifting the cutter away. I not conversant enough with Gcode to attempt to amend it. Can anyone help please Ken
i will await the sketchup file, backstitching is a known issue caused by sketchups internal shenanigans with line order, ie it *sometimes* considers an arc to be clockwise yet has all the line segment start points anticlockwise. sometimes this can be detected and fixed internally, and sometimes not.
Once is sufficient - David will get to you in due time, he is a volunteer. You've posted the file 3x now
Thanks for the file. First I deleted small segments from the ends of the bridging parts. The bits I deleted are about 0.3mm long. Example of the bottom bridge below, but I deleted from all 3 (ignored the very short bridge on the right) Now you can see if the face of the circle is selected, this is all one piece.,,, now the Gcode has no backstitching in it, it will cut those 3 bridges and then the rest of that outline. \ How to delete a small segment of the end of each line ? zoom in on the bridge select the line tool draw line at 90 degrees a small distance from the end of the existing line. this will split the line at the intersection select the delete tool delete the small end segment to leave a gap delete the line you added note that you cannot create line segments less than 0.001" long, Sketchup's internal 'equality' comparison works to 0.001", even in metric mode, so anything less than 0.001" away from something else is automatically joined together.
