4hrs in it starting skipping on 1st cut (pulley is slipping off teeth, have realigned it many times and gave retensioned the belt many times)
2nd cut started doing it around 2hrs in.
I’m cutting australian hardwood. My depth of cuts are shallow and I’m running a makita 700c doing 7% stopovers (left a line as it was skipping and gradually going deeper to the stl shape)
Now when I’m homing at low rpm the x axis belt is getting chewed up and I have to either aid the axis with my hand or simply turn it off… this happens in the same spots along the belt, weird part is it is places where I have not used the cnc for milling. I have been milling in the middle. To the far left of the axis if I start homing it starts moving then slips like crazy then gains some grip and then makes it to around 30mm in and slips and needs human aid to get it moving, it slips in the same spot the line was left in my project and also to the right side outside the area on the table along the x axis that I was using for my project (I’m using it for 3d carving with meshcam)
I’m suspecting these belts are no good from carbide, I don’t mind servicing my machines
But I’d like to do an actual project with the machine.
I went to the extreme of cleaning the belt with a brush, a blower and a vacuum… I even cleaned the pulley gear…
Pulley gear grub screws have blue thread locker. And tightened right up. Alignment has been checked dozens of times, idlers have be tightened as one had slight play and I’m a perfectionist.
I even added a longer bolt on one side to allow more tension, then homed the x axis and shut the machine off as it was homing once it was 95% over so I had tension on the shorter belt side of the spindle so I could eliminate any opposing slack.
Am I missing anything here?
I have built cnc machines and 3d printers that use belts (6&9mm 2gt and a gt3 setup) and this machines is playing up pretty much straight out of the box.
I have ordered steel core 2gt 15mm 2mm pitch
And have also ordered gt2 kevlar 3mm pitch for the consideration that the 2gt 15mm x axis belt on this model is not up for the job after finding many posts on the internet with the exact same issue.
If someone can shed some light I’d be extremely grateful for any knowledge or help.
The ball screw version came out just after I purchased this… 
I don’t want to add any screw or any pinion system, I’d like to keep it as light as possible as I use the y belts for cutting, the x axis is simply for following the wood grain on my 3d carvings, it’s not even doing a great deal of work…