First off you need to start with the gantry straight, once it is not straight all sorts of bad things can happen. To line it up, turn the machine completely off and then you can push each side all the way back and that will line it up. If it then gets skewed quickly push the pause button and then open the lid a bit to shut that cut down. At that point using your phone to take photos could be revealing (one person discovered an escaped hold down magnet!)
Ooooops! I’m sorry…that was a response to a Private Message…I’ll copy out the contents here:
What was causing my gantry to jump out of alignment was a red cable that runs underneath the tube getting hung up on the fins for the heat sink. IT IS A HIGH VOLTAGE CABLE. Be damned sure that you unplug the machine before testing this.
You will need a few things to test this:
A small LED flashlight.
A cushion to kneel on. (optional)
If you have a lighted extending mirror that would be fantastic, if not, you’ll need to get a small mirror too.
Unplug the machine from the outlet.
Open the lid and lower the front drop down door.
SLOWLY move the gantry (the laser arm) to about the mid point of the bed.
Carefully place the lit flashlight on the left rail. Tape it down to keep it from shifting, it’s easy to knock it off.
Looking down the left of the rail, underneath the gantry, you should see a reddish thick cable in the gap between the tank treads and the left wheel. Yours will likely be a lot cleaner than this one:
Take a picture of it with the camera if you can see it. (Hold the phone upside down.)
If there is too much slack in that cable, it will hang up on the fins of the heat sink when the unit homes to the back of the machine.
So what you are going to do is slowly, carefully, and GENTLY push the gantry towards the back, while keeping an eye on that red cable, and see if it binds on the fins of the heat sink. In order to view this, you might need to employ the mirror, and it helps to have someone hold the flashlight on the fins. You’ve got to get down at eye level to see it, so a lot of bending or kneeling comes into play.
If you see that it is catching on the fins, stop pushing it and pull it back forward again. Let me know so I can link you to the instructions for fixing it.
If the red cable clears the fins, it’s some other problem, and we can go back to tensioning the belts.
Or make sure when you heard the “weird sound” that the head or gantry had not hit something. That blower shroud hangs down a lot and when it hits something we do not see it at that time. There are also other odd crumbs that could be interfering if they happen to fall in a bad place.
That damage might kick a stepper motor loose and that would need checking.
We have looked everywhere. Nothing was sticking up. Nothing on the tracks. We have only had the machine one month and this was our first project to push out for sale. We were cutting leather, the leather was still laying flat. We have never used any magnets in it.
Thank you for reaching out about this yesterday in chat. Unfortunately, it looks like your unit is experiencing an issue that we can’t resolve remotely. I want you to have a reliable unit, so I’m recommending we replace this one. I’ve replied to your email about your next steps, so I’m going to close this thread. I’m so sorry about the bad news.