Laser max rate

[bucky]

Hi all
I've been using my CNC router for a while and recently have been doing a fair bit of laser work which works well. I've tried some images, creating the g-code in Lightburn with the suggested edits to the G-code. I've noticed that if I go above 50 ipm, at random times the laser develops a 'stutter' when it sweeps over the surface which creates a bad vibration. Not sure what is causing this - I know it's a lot of g-code the computer is pushing out but what is typically the limit you'll hit first and any suggestions on troubleshooting? Even getting to 100 ipm would be a great improvement. The computer running Acorn is not connected to the network, no anti-virus, using a shielded cable, and passes the comms test.

Thanks!

[grossmsj]

I don't go higher than 85-90 ipm. That gives me results where I can do three days of work with no failures.
I have had problems in the past with really crazy stuff happening, but that seemed to be fixed by modifying the g-code to give very explicit laser on-off commands. I'm not sure this is what you are seeing.
What are the 'suggested edits' you are using?
What is the CNC?
When you say you are doing images, are you doing raster work or working against svgs?

[bucky]

It's raster work. It's a 4x4 gantry router where I can mount the laser on the z-axis offset from the spindle. The suggested edits are running the g-code through a Notepad++ macro to take out M4, M2, etc and I turn off smoothing and velocity modulation. I did check the box in Lightburn to put an S value on each G1 line and the g-code looks like it has that. When I have the resource monitor running, the cpu and memory loads are always pretty low. Sometimes I see the disk usage (SSD) spike around the stuttering but not always. Curious what max rates others have been able to achieve, maybe my expectations are too high.

[grossmsj]

That all sounds good. I don't do much raster work, mostly all of it with SVGs.
I really don't know what the Acorn is capable of in terms of throughput, but I'd suspect that's where the limit is.

[Houseman303]

It's raster work. It's a 4x4 gantry router where I can mount the laser on the z-axis offset from the spindle. The suggested edits are running the g-code through a Notepad++ macro to take out M4, M2, etc and I turn off smoothing and velocity modulation. I did check the box in Lightburn to put an S value on each G1 line and the g-code looks like it has that. When I have the resource monitor running, the cpu and memory loads are always pretty low. Sometimes I see the disk usage (SSD) spike around the stuttering but not always. Curious what max rates others have been able to achieve, maybe my expectations are too high.

smoothing must on, if short vector lines in the G code

[Sword]

Post a report, and we can see what processor your PC uses to find the single thread rating for it. If too low, you can encounter stutters.

[bucky]

Is this what you're looking for? If I'm looking it up correctly, I see 1791 as the single thread rating. I don't really do enough of this type of work to justify switching to a beefier computer if that would be the difference. Mainly I'm curious now what becomes the bottleneck first if it gets pushed too hard? Or any other suggestions welcome.

[Houseman303]

Is this what you're looking for? If I'm looking it up correctly, I see 1791 as the single thread rating. I don't really do enough of this type of work to justify switching to a beefier computer if that would be the difference. Mainly I'm curious now what becomes the bottleneck first if it gets pushed too hard? Or any other suggestions welcome.

As I already wrote, G64 must be active, otherwise G61 is active.

[bucky]

Smoothing seems to make it way worse and can't even get 50 ipm without jerky movements.

[cnckeith]

Smoothing seems to make it way worse and can't even get 50 ipm without jerky movements.

the cpu single core rating is fine.

post the offending g code program