Lightburn workspace not matching laser position for sculpfun

I have a Sculpfun Sf-A9. It homes great but when I try to frame it goes to a spot that is 5 or 6 mm from where the item that I am wanted to engrave. I did the $# and $$ and everything looks good. The home position is in the lower left hand corner and X,Y is both 0.0 for the position. Here is a link to the video I made to send to Sculpfun…https://drive.google.com/file/d/1-0rh4dAlXCQDQ9ZHY1VQ8JCeHPnnHgIw/view?usp=drive_link

thanks in advance

Are you in absolute coordinates?
No laser offset?

Yes im in absolute used to be a machinist so i understand this a little better than the others and as far as i have seenn no offsets unless they are somwhere beside the top left corner

Nothing set in device settings?

No offsets there either

The linked video is not publicly available. Can you review permissions?

Can you elaborate on what you’re doing here? How are you determining distance from the spot to what you want to engrave? This implies that you are trying to align to a target material.

Rather than asserting that things look good I would suggest actually publishing what you have in order to get more eyeballs on it. Can you run these commands in Console and return the output:

$H
$I
$$
$#
?

Also, please include the following:

  1. full screenshot of LightBurn with your design loaded and ready to frame. Please make sure that Laser window is in view
  2. screenshot of Edit->Device Settings

I will do it on the morning and paste it i am guessing on the spacing and i will look at the settings on google drive

The restrictions have been lifted. If you have a look at the video you will see that i am trying to do a business card and the image is below the card it self

Here are the items you asked for $H
Stream completed in 0:03

$H

ok

$I

[VER:1.1h.2023112801:]

[OPT:V,15,128]

Target buffer size found

[MSG: Using machine:Sculpfun SF-A9]

[Radio Mode: AP, Sculpfun SF-A9 37951, 192.168.4.1, Not connected]

[MSG: Machine tilt sensor initialization successful!]

[SD card is functioning properly!]

[SD Free:119.71 MB Used:292.00 KB Total:120.00 MB]

ok

$$

$0=10

$1=25

$2=0

$3=3

$4=0

$5=1

$6=0

$10=1

$11=0.010

$12=0.002

$13=0

$20=0

$21=1

$22=1

$23=3

$24=200.000

$25=3000.000

$26=250.000

$27=2.000

$30=1000.000

$31=0.000

$32=1

$41=0.000

$40=0.000

$100=100.000

$101=100.000

$102=250.000

$103=100.000

$104=100.000

$105=100.000

$110=20000.000

$111=20000.000

$112=20000.000

$113=20000.000

$114=20000.000

$115=20000.000

$120=1000.000

$121=1000.000

$122=1000.000

$123=1000.000

$124=1000.000

$125=1000.000

$130=400.000

$131=400.000

$132=200.000

$133=300.000

$134=300.000

$135=300.000

ok

$#

[G54:0.000,0.000,0.000]

[G55:0.000,0.000,0.000]

[G56:0.000,0.000,0.000]

[G57:0.000,0.000,0.000]

[G58:0.000,0.000,0.000]

[G59:0.000,0.000,0.000]

[G28:0.000,0.000,0.000]

[G30:0.000,0.000,0.000]

[G92:0.000,0.000,0.000]

[TLO:0.000]

[PRB:0.000,0.000,0.000:0]

ok

?

<Idle|MPos:0.000,0.000,0.000|FS:0,0|Ov:100,100,100>

ok

Are you trying to rely on the camera for framing? Your camera calibration may be off.

Here’s a quick test.

Verify that your work area is as it’s supposed to be. Get a piece of cardboard larger than you work area that still fits within the confines of your laser and make a box 400x400 and run it in line mode at a low enough power to mark the cardboard but not burn through. That is your work area.

Make a small box in Lightburn and position it 250mm from the left edge and 250mm from the front edge. Without moving the cardboard burn the box at low power and see if it aligns with the camera view and also if it aligns with the measurements from the edge of your marked work area. I would bet thet the physical alignment is correct but your camera is off.

2 Likes

Will try what you asked but i just finished realigning the camera it was off (now aligned) when i laser ed a + on a piece of wood i just tried a small box on the same piece of wood a the framing was still off. i am trying to be able to use a jig so ii can do more than one item at a time.

If you’re using a jig, forget the camera. As long as your laser goes where you tell it to, the jig will line up.

4 Likes

Ok thanks i will try and make a new jig and put my cards in it and see if it will work

You do need to have a way to physically position the jig in the same location. A fence or something.

Seems to me there’s still an issue here. Even in the overlay you can easily visually see that the gantry (or possibly one frame of the laser, the blue horizontal component) isn’t parallel to the X-axis grid lines.

If properly aligned the grantry should be perfectly parallel with the X-axis.

Camera should be able to get you within a couple of millimeters of alignment or better. For anything beyond that you’ll need to use other schemes such as the jig approach.

here is a xreen shot of the test

@berainlb i agree but dont know how to fix it. i have seen that for a few days now i have watch a sculpfun video and loosened the y axis grub screws an it was off a little but not sore about the x because it as a linear rail

this was after i laser ed the boxes