Speed problems with version 1.2.00

Just updated to version 1.2.00, and I’m having trouble with the speeds.
I always used mm/min (I’m from Belgium :-p), and when engraving wood, I always set it to 3000 at 80%.
After the update, the laser went at crazy speeds. So now I have it at 1000 mm/min at 100%.
Is there something I missed, or might this be a bug?
I tried removing the prefs folder, reïnstalling, but thus far, no clue.
Both new and old project suffer from this.

Anyone that has an idea what might have gone wrong?

Confirm that you are still configured to using mm/min in Edit->Settings.

Confirmed, That was the first thing I checked

Is this affecting both line and fill operations?

Can you setup a simple design and then save the gcode and post here? Let’s verify that what’s being sent to laser is correct.

Will do that when I get home.
It’s on both line and fill.

Here is the gcode. Looks okay to me

; LightBurn 1.2.00
; GRBL device profile, absolute coords
; Bounds: X54 Y206 to X121 Y249
G00 G17 G40 G21 G54
G90
M4
; Cut @ 3000 mm/min, 5% power
M8
G0 X54Y206
; Layer C00
G1 Y225S50F3000
G1 X67
G1 Y206
G1 X54
; Cut @ 3000 mm/min, 5% power
M8
G0 X72Y206
; Layer C01
G1 Y225
G1 X85
G1 Y206
G1 X72
; Cut @ 3000 mm/min, 5% power
M8
G0 X90Y206
; Layer C02
G1 Y225
G1 X103
G1 Y206
G1 X90
; Cut @ 200 mm/min, 5% power
M8
G0 X108Y206
; Layer C03
G1 Y225F200
G1 X121
G1 Y206
G1 X108
; Cut @ 3000 mm/min, 5% power
M8
G0 X67Y230
; Layer C04
G1 X54F3000
G1 Y249
G1 X67
G1 Y230
; Cut @ 3000 mm/min, 5% power
M8
G0 X72Y230
; Layer C05
G1 Y249
G1 X85
G1 Y230
G1 X72
; Cut @ 3000 mm/min, 5% power
M8
G0 X90Y230
; Layer C06
G1 Y249
G1 X103
G1 Y230
G1 X90
; Cut @ 3000 mm/min, 5% power
M8
G0 X108Y230
; Layer C07
G1 Y249
G1 X121
G1 Y230
G1 X108
M9
G1 S0
M5
G90
; return to user-defined finish pos
G0 X0 Y0
M2

Yeah. I don’t see a problem with the gcode.

So that leaves a few possibilities:

  1. Somehow previous version of LB was generating different code
  2. Something has changed on the controller side to interpret things differently
  3. Something has changed mechanically. Perhaps you were never getting the full speed specified and now you are getting something closer to it.
  4. Your machinery is malfunctioning and not doing what it’s told

Are you able to take a video of the laser in action and measure the actual speed? If so, you may want to measure only the central part of the movement ignoring the ends which will be affected by acceleration/deceleration. If you do this it might be useful to pre-burn distance markers to make the measurement easier.

Did a line of 30 cm (300mm), so at 3000mm/min that should take about 6 seconds.
I did a stopwatch test, en I actually got 6.36 seconds (human error brings it to 6), so I guess the speed is correct.
I think 4 is not the problem, I still get what I made, but not perfect with the new speeds yet.
So maybe with the last update it fixed an accidental bug?
Guess it’s back to testing then to get the speeds again.

Cheers for the help

1 Like

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.