Having issues setting first time homing

I got frustrated and left the office.

When homed it says 0,0,3000

I believe it’s finally homing correctly

My issue is it’s not calibrated for distance.

The video I watched, I’ll link when I get back to my laptop. Stated if your roller blah blah was off… to do a 10mm square or 1”

Measure it once it’s cut and see how off it is. Then enter the difference in the calibration section…

What I’m seeing is that the laser pointer will be at 0,0 I’ll place a ruler under it and bump the jog twice. Where ever it lands I took a measurement on the ruler and what the X axis said in lightburn.

Laser pointer stopped at 100mm on the ruler but light burn shows it’s at 144mm.

With that being said… the roller calculation is wrong so when it travels down the gantry. It’s thinking it’s going further than it actually is… which is why is stops short of going the full length of the print bed.

So it’s like 44mm off at 100mm

I can’t figure out how bad it’s off because I can’t laser anything right now with the mirrors out of alignment.

This is the video I watched and kinda my thought process on my above statement.

That says the X and Y axes are homed and the Z axis isn’t, which is what you’d expect with Z axis homing disabled.

My machine has an auto-focus “pen” (switch) and does not home at startup, so the Z axis remains at 3000 mm until I do the focus dance.

Set the jog distance to a simple value like 100 mm to eliminate one variable.

Does the machine have a red dot pointer? If it does, even if the dot is not aligned to the beam, use the dot to mark the distances. If it doesn’t have a red dot, cable-tie a stick to the laser head.

Set the end of a good scale / ruler at wherever the dot / pointer is now. Jog 100 mm and measure where the dot / pointer ends up on the ruler; this will require a few iterations to align the ruler parallel to the axis travel.

Suppose you tell it to jog 100 mm, but it actually moves 66 mm. Feed those values into the LightBurn Axis Calibration tool:

LightBurn Axis Calibration

Write it to the controller, iterate a few times, and you’re done.

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Thank you for the awesome replay.

I will do this in the morning,

Halfway want to drive back right now to test this out.

I did however get mirror one and two back in alignment but my laser is hitting the bottom of the air injection cap and will try and adjust that in the morning to get it back on center.

Always a good idea to mark the thread solved on whatever post was most applicable. Start a new thread with your next problem…

The issue is no one will find this unless they are looking for a problem on correcting the distance and on homing… It also keeps the groups smaller.

Maybe @JohnJohn can split it for us.

Glad you’re up and pretty much running…

Have fun

:smile_cat:

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I just wanted to thank you for the help on this. This did correct my bed size issue.

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Excellent!

Now that it homes and moves correctly, you can make some progress with aligning the beam. As @jkwilborn suggests, start up another thread if you need more help.

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