I’ve been having concerns with belt stretch in my shapeoko 4. On a whim I bought GT2 steel core timing belts. I want to replace the x axis carriage belt as when you push the spindle with any small force, the spindle has a more than noticeable amount of deflection/play. This has resulted in bad v carves and other issues with cuts being off due to belt stretch.
It’s mostly a problem with the x axis because there is only one belt controlling it whereas the y rails have two total belts (more tension). My belts are properly tensioned and I’ve been having minor chatter issues since the start. When the machine is cutting in the x direction you can see lots of chatter but due to having really nice Amana tool carbide bits the cut is still nice.
Has anyone done this on a Shapeoko 4 yet? I’ve heard there might be issues from the motor pulleys being too small and bending the stiffer belts. How long do these typically last?
We tried steel belts for a while on the SO3 — they are initially stiffer and easier to tension, but as you note, due to the tight bend around the pulley suffer from metal fatigue and wear out all-too quickly. We went back to the fiberglass belts — they last for a year or so of average use.
If your belts aren’t working well, please contact firstname.lastname@example.org and we’ll do our best to sort out what the difficulty is with you.
Hi all! I canceled my order for the steel core and decided to get fiberglass reinforced belts. I had credit card points so I used them to pay for my order so I’m basically upgrading for free. I’ll post a video in a bit of it cutting. Will the fiberglass belts make a difference?
Just curious, does the shapeoko use GT2 or 2GT. My SO4 says 2GT so I’m assuming 2GT. Are the stock belts fiberglass reinforced? If not then I’m definitely going to get some as I can easily apply force to the carriage and wiggle it. I need better stiffness and less play in the carriage.