Replacement is on its way, but does anyone have an idea what could have caused this and how to prevent this in the future?
I don’t think that there was too much tension on the belt because I could easily slip a finger underneath it.
It must have happened during the last three weeks where I didn’t use the machine it was really hot here in Germay.
I have seen this reported on the forum a couple of times, with no obvious root cause, so it might just be a random quality issue with the belt (the heatwave we got in Europe two weeks ago may not have helped indeed)
I have come to think of belts as another consumable item, two years ago I got a roll of steel-core belts (like those), swapped the three belts on my SO3 a few times, and have not yet used up the whole roll.
Those are the belts I currently have, they seem pretty good to me.
Remember the hint (I cannot remember who posted it sorry) about taping one end of your new belt to the old one to pull it through to avoid the “fun” of trying to thread the new belt through the pulleys.
It’s not just your gut BTW, the SDP documentation lists steel reinforced belts as;
Operate Over Small Pulley - Poor
High Speed Pulley - Poor
High Intermittent Shock Loading - Good
Vibration Absorption - Poor
Low Belt Stretch - Excellent
(and a load of other characteristics)
But I think it’s safe to say your findings match the selection criteria of “don’t flex steel cored belts rapidly round small radii”