Hello,
I have a small problem. The progress bar shows values that have nothing to do with reality. Often it starts at 50% or even 99%. But the timer shows the correct values. Elapsed time and expected time.
If relevant:
Am I the only one with this problem? Does no one else have this?
The progress bar represents the Sent Data in the stream leaving LightBurn. Laser Engravers have a data buffer. From that buffer the engraver processes and deletes blocks of GCode as quickly as it can.
There is some back-and-forth communication about the data stream but the actual progress and position of the laser engraver isn’t fed back to LightBurn. LightBurn can not detect how far along the laser engraver is in the job.
The head position information can be requested but when GRBL was written constant position reporting was generally considered to be a detriment to performance. Because the position of the engraver is not constantly shared back to LightBurn, it’s a challenge to pick up a stopped job after a power failure.
It looks like someone at OpenBuilds has 200ms real-time position reporting for newer 32 bit controllers. Apparently it makes for huge log files.
Thanks for the background info. I can well understand that the software does not know exactly how far the laser is already.
For me, the remaining time display in brackets is a good orientation. I am surprised that the bar does not correspond to the remaining time display. Wouldn’t it make sense? Or is that intentional, the bar shows the transfer of the data, and the countdown shows how much time is left?
(The latter is surprising to me and I would like to have a bar for the time as well).
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