Quote Originally Posted by John S View Post
Another thing to bear in mind is that 10 tpi two start is worked out as 5 tpi, the greater the tpi the more torque you need to move a carriage.
Don't you mean the lower the tpi the more torque? I don't need help with being confused ;). Ignoring efficency issues 5 turns per inch of travel has to take more torque than 10 turns per inch.