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31-08-2013 #10
Here is a simplified, why backslash in reality will not happen with these belts
Imagine 2 pulleys on a horizontal plane with a belt mounted. When tightened the belt, all the teeth from 6 to 12 o'clock on the left and from 12 to 6 on the right will preload.
Now imagine the belt start to move clockwise driven by the left pulley. From 9 to 12 o'clock is where the backslash will happen, but from 6 to 9 will be still preloaded. At the right pulley the same. From 12 to 3 backslash and from 3 to 6, tooth engaged.
So at any time at least half of the engaged teeth are without backslash.
Hence the tooth strength together with the tension plus the pulley size , if enough will not permit backslash.
18t pulley is what i use on my machine, changed from 14, he he. For other reasons though.
Yeah, for the Z it shouldn't be a problem.
When i changed belts even when the pulleys were tightly fitted they gave me problems, especially the small ones connected directly to the motor shafts. They were backslashing by slipping on the shafts even if i used 3 grub screws on each. And only under heavy loads so it took me a lot of time to figure the problem. A little "super" glue eliminated this.
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