Delay for Laser Plugin

[andileibi]

Hello experts,
Is it possible to add a motion delay in the laser plugin?
In each row, the first one or two millimeters are not lasered because the axis is already running and the laser lens needs some time to start.
See attached pictures

IMG_20201114_114126_zoom.jpg (4.04 KiB) Viewed 7808 times

[3d0g]

Looks more to me like it needs some backlash. I couldn't get quality engraves out of the laser plugin without adding a bit of backlash, even though the machine doesn't need it for normal cutting operations.

[andileibi]

Thanks for the answer, I usually don't need a backslash for my machine, at least not for milling, not even for laser cutting when I laser cut contours. When I laser out contours, I create the G-code in Aspire and use a post-processor there that has set a delay of 100 ms for each milling process.

Update: Post processor file added

[3d0g]

Yup, my machine is the exact same way. Zero backlash for all other operations but it's a must for engraving. There's also some drift in the X zero location with UCCNC engraving operations. I can fire a pulse at zero, run an engrave job, go to zero and fire another pulse and it won't match. Repeat and it consistently drifts. Cost me a lot of expensive sapphire watch backs learning this lesson.

[cncdrive]

The UCCNC puts out the rows from left to right in syncron to eachother, there can be very minor time difference though, because 0 time is only theoritical, this could possible cause a shift with very fast feedrates. Also if the feedrate is very fast then the delay of the laser electronics can cause issues if it switches the laser on/off with a small delay.
We have a plan to make some improvements in the laser plugin though, to allow to select engraving from one direction only and then from the other direction there would be a rapid moveback. And also with the ethernet controllers that very small possible time lag could be further lowered with optimising some code.
This is planned to be done in the next round of developments.

[andileibi]

That sounds good, but laser engraving takes a lot more time if it is only engraved from one side.
Isn't it possible to make a delay so the axis waits a few milliseconds before moving?
The delay should be adjustable so that everyone can adapt the delay to their laser hardware, as well as the minimum and maximum laser power or feed rate.