Hi all
I have alot of short lines in my design(its bending lines).Im doing it in 2 passes,1st pass is focused at the surface,and 2nd pass is 1 mm down.Lightburn generates G code,and its working fine,but i see one problem.On second pass,laser head comes to the beginning of a line,moves 1 mm down,burns a line,moves 1mm up,goes to next line etc.It takes a lot of time unnecessary.There are more than 200 lines,and i waste 20 minutes or more on this Z movements.Can it be done differently?
That reads like a drill cycle on a CNC. Have you confirmed those Zaxis moves are in the GCode created? I am wondering if that might be a canned cycle in the controller.
P/S. If it is, don’t paste the entire GCode in your Reply. The first 20 lines will be fine.
; LightBurn Pro 2.0.04
; GRBL device profile, absolute coords
; Bounds: X33.23 Y59.02 to X680.27 Y494.64
G00 G17 G40 G21 G54
G90
M4
; Cut @ 1400 mm/min, 100% power
M8
G0 X39.349Y201.2
G0 Z0
; Layer NormalCut Pass 1 of 2
G1 X53.354S1000F1400
; Layer NormalCut Pass 2 of 2
G0 Z-1
G1 X39.349
G0 Z0
G0 X58.954Y201.2
; Layer NormalCut Pass 1 of 2
G1 X83.954
; Layer NormalCut Pass 2 of 2
G0 Z-1
G1 X58.954
G0 Z0
G0 X89.554Y201.2
; Layer NormalCut Pass 1 of 2
G1 X103.651
; Layer NormalCut Pass 2 of 2
G0 Z-1
G1 X89.554
G0 Z0
G0 X103.102Y204
; Layer NormalCut Pass 1 of 2
G1 X74.255
; Layer NormalCut Pass 2 of 2
G0 Z-1
G1 X103.102
G0 Z0
If I make just 1 pass,estimated time is 22 min.however,if i do 2 passes with that 1mm movement time increases to 1h 12 min.I found some sort of solution by creating completely new layer with same lines and i am doing 1 pass each.
testproject.lbrn2 (221.3 KB)
There is no need for Zaxis travel when cutting live hinges. Using the GRBL Device type, no Zmotion is commanded. Without details of your setup, like controller type, I must guess at a solution.
I think you need powered Z travel to move to the focus position, guessing you have no means of moving it manually. So try this: Get everything set up and ready to go, including setting Z at the proper focus height. Now go into the Device settings window and turn off Enable Z Axis. Then run the program.
Does increasing the Z-Speed setting in the Move window make any difference?
I noticed that also on my machine. When i use the layers to move the Z axis down for subsequent layers it seems to reposition itself for every object which takes an extremely long amount of time. I haven’t found any good way to get around this other than running one layer at a time and repositioning the Z axis manually between each layer. Seems to be just the way lightburn does things .
I just can’t cut all the way through with 1400 and 2 passes when focused on a surface,so I thought I might try 1 mm inside material for 2nd pass
For those with manual Z adjusters, thick materials are set with the focus to be adjusted about half way into the material. That way you are a little out of focus at the top and bottom, instead being way out of focus at the bottom.
Can you turn off Zmotion or Auto-focus for this project?
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