Well as with most things mechanical there are different options
on configuring the Timming belt arrangement.
1) good - one timing belt covering the 40" distance driven somewhere inbetween.
2) better - two timming belts comming from a double Timming pulley mounted
motor centered between the leadscrews this would shorten the length of each timming belt because the centerdistances only needed to be 20".
Depends on the accuracy your machine will be capable of, if the overal design is configured to end up with less then 0.001" accuracy I would go with option 2 else option 1 would be simpler and sufficient. |