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.
The Following User Says Thank You to Boyan Silyavski For This Useful Post:
I personally will not be using them again. Clive
Last edited by Clive S; 01-09-2013 at 09:00 AM. Reason: Wrong date
I have servos with 19mm shaft and i want to retrofit a lathe (1.6m between centers) .
I want a pair of timing pulleys with 1:3 reduction for Z axis and a pair of timing pulleys with 2:3 reduction for X axis.
What kind timing pulleys/belts will be best for that application that they have NO backlash and good quality/performance ?
Also all car engines have inside timing pulleys ( What Is a Timing Belt ? - AutoZone Car Care - YouTube )
So you can extract for free timing pulleys from old broken car engines if you go at car repair shop and search at scrap engines.
I have extracted some timing pulleys from broken engines but i don't know the type of pulleys to order matched timing belts.
Where can i find a chart with specs with all types of pulleys to identify that i have extracted from car engines ?
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