Latitool grinding and going to the wrong home position

I just purchased the latitool laser. GRBL. I have a Mac book pro as well as a windows computer. Tried setting the laser up on both computers

I follow all the instructions and have set the laser up with the x axis 400 y axis 400 and 0,0 is at the front left bottom corner.

When the machine homes it goes up to the top left corner and grinders for atleast 1 minute.

Any help is appreciated because I have tried everything I can do.

No videos I can find regarding this laser.

LightBurn plays no role in the homing process other than in requesting the cycle to begin.

Are you certain your machine has homing switches? Look for mechanical or proximity sensors that would actuate when the machine homes. If you do not, that explains the grinding. In that case, disable “Auto-home on startup” in Edit->Device Settings.

You should then follow a manual homing process by turning on the machine with the laser head at front left of the frame. Make sure to move the laser head fairly slowly as the motion induces an electrical current from the stepper motors.

Yes it has hominy switches. When it starts up it goes to the “home”position which is supposed to be in the bottom left because that’s where 0,0 is but instead it goes to the top left and grinds

Home position and origin position are not necessarily the same thing.

Can you confirm that the switches are located in such a way that they would actuate at front-left?

If so, make sure that the stepper motor cable for Y has not been plugged in backwards. Meaning 180 degrees turned on either the stepper motor side or on the controller side.

Just spectating from the sidelines here. If the above is true, could it possibly be an issue with the $23 values? Just a thought.

Yes. But I wouldn’t expect the machine to ship misconfigured for a stock machine.
So until something demonstrates that the board is inherently misconfigured I’ll assume that there’s something wrong with the installation.

My preference would be to identify and resolve an installation issue before resolving it with a configuration fix otherwise the user will always be dealing with the after effects of having a unique customized firmware. This could complicate resets of firmware, upgrades, installation of extension kits, etc.

Don’t let it grind for such a long time! If it hits the frame at some point, shut down the laser IMMEDIATELY. Otherwise, the driving mechanism and belts can be damaged.

Following PYs suggestion, you could also try to send “$RST=*” via the console window, this should restore all factory settings (should help in case the laser was correctly configured from the factory). If it still homes to the wrong location, here is a guide on how to change the homing directions: Limit Switches - Diode Laser Wiki
Another note: make sure the laser is moving in the correct directions when using the move buttons, before changing homing directions.

I will post a video of the machine shortly but see the




picture for the machine settings.

The machine settings by themselves won’t be of much use.

There have been a number of questions posed in previous posts. Can you respond to those? They will be relevant to understand the state of the machine and what you’ve tried.

I posted a picture of the machine settings.