Hello, I am a beginner and am having problems setting up a chuck.
Connection, settings in the software, everything is working as expected. Engraving works.
Unfortunately, I have a problem with the speed when turning. I wanted to cut a 20x20mm rectangle into a tube for testing. The horizontal cuts are perfect, but the vertical cuts are only slightly cut. At slow feed rates, it is clear that the horizontal movement is much slower than the vertical movement.
The size of 20x20 mm is correct.
Do I need to change something in the machine settings? Both axes are set to 157.5 mm.
Hello, thank you for the tip.
Unfortunately, I cannot find the “Jump Settings Defaults” setting. V2.0.05
I don’t think it has anything to do with the jump command. When I reduce the speed to 5 mm/s, for example, both axes slow down accordingly, but Y is simply faster.
I think the speed is defined in the machine settings under Steps/mm. Because the stepper of the rotary axis has a different transmission ratio than the linear drive, a different speed is also created.
I don’t think Lightburn takes this into account. The diameter would also have to be calculated for the speed, as the circumferential speed changes depending on the diameter.
The rotary axis device with a chuck is apparently only suitable for engraving. Does anyone have experience with a roller device? At least the circumferential speed would always be the same. Can the machine be set so that Y-steps/mm can be adjusted accordingly?
Formula for calculation?
Does anyone have experience with this?
Update:
I found the error. A roller is better.
To adjust:
Turn off rotation in the software.
Cut a rectangle measuring, for example, 50 x 50 mm onto a round test object with low power.
Measure the Y length.
Calibrate the Y axis in the machine settings.
Set the roller diameter in the rotary setup and set the circumference of the roller under “mm per rotation”.
This actually eliminates the need for rotary setup settings. Enabling rotary is then unnecessary.
In principle, this method can also be used to set up a rotary, but the Y-axis must be recalibrated for each new diameter.
This setting is important for cutting on a round body, but not for engraving.
This means that the cutting speed for the X and Y axes is the same.
Performed on OMTech K40+
Please excuse any minor errors. This text has been translated using Deepl.
You are the first I have seen cutting with a rotary. Engraving is the normal. Technically, the only difference between cutting and engraving is power, speed, and number of passes.
Thanks for the update. It appears you have fiund a workable solution.
I want add some problem with rotary on Galvo. if you have pulse width adjust laser source, rotary working slowly, every slice it use 8ms pause of MO pause.
Interesting thought. The 8ms seems very insignificant to me. You also have the acceleration and deceleration each slice which are a couple factors more then MO and still very insignificant unless your splits are as small as your LI. Have you tried lowering the MO? The dominant paradigm is leave it alone.
There’s actually a simple way to set these up. I detailed it in this thread.
I have cut windows and holes out of a 3/4” acrylic tube while it’s on the rotary. If the machine is properly set up, then it should work. What’s more likely is that the rotary is slipping a little causeing your numbers to be off in the rotation direction.
I have my rotary axes acceleration and jump off values greatly reduced.
@Michl73 there isn’t much use in referring us to the same thread as we’re reading.
i use jpt GUI for adjust pulse width and in laser parameters in lightburn disable pulse width control, in this case rotary more faster, but in ezcad or seacad i dosnt see this problem. i try MO delay more than 8ms a see difference. MO must be open in marking start, but in Rotary mode every slice like a new laser start. i hope you understand what i write
Can you explain more of what you’re doing to accomplish this?
If you set the pulse rate in some other place, what’s the difference?
My understanding is that the time is exacerbated with a rotary because the controller has to hand over control to Lightburn for it to turn the rotary the next interval or step, then control is returned to the controller.
I’ve read in many places that too low of an MO can damage the machine, so I’m hesitant to change it. Mt machines MO has always been configured to 8.0.
Uncheck enable q-pulse width, then try rotary stage. Every sclice lightburn enable pulse width(this parameter need more time in control board)
If you use lightburn without pulse width control, rotary goes more faster. Now for fast marking i use GUI control of pulse width, but its look like lifehack.
I’ll try that when I get a minute. Do some identical engravings Q-Pulse width enabled and and Q-Pulse width disabled with a stop watch or video with counter and see what I get. try small splits and large splits.
If you hadn’t said anything, and someone would have asked me, my opinion would have been it’s not a measurable difference. We’ll see.
