HTD3 or HTD5 Optimum timing pulley sizes for least backlash

[JustinPM]

Hello,

I'm designing a CNC router roughly 1100mm x 800mm, I plan to drive the ball screws (16mm) via timing Belts and Pulleys. The HTD series seems to be a popular choice. I'm wondering however, since I'm going with a 1:1 ratio is there an optimum tooth count that exhibits the least amount of backlash? Also, in 1:1 setups does the tooth count have an affect of the torque transmitted?

Justin

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[Eldon_Joh]

larger the pulley diameter the lower the belt tension needed for reliable operation. no idea on the minimum number of teeth as it relates to backlash. with a large enough pulley and enough tension the backlash doesn't show up instantly as the belt slips in the cogs, it takes time for the belt to walk, like a v belt slipping at a rate of .2% where as if the belt is loose then it will show up instantly.