Hi P5K, you're right up to the end of the jackshaft. From here on one rev of the shaft is 13 teeth of the gear on it and this travels 13 X the pitch of the chain. If the pitch of the chain is for example 1/4", then we have:- 13x1/4"=3 1/4"
This is because the gear contacts the chain at it's pitch circle, not at the tip. If you look at spur gearing you will see that two gears meshed together roll on a pitch circle as if it were friction drive, and have protuberances called teeth to reduce the slip.
So for every turn of the jackshaft gear you travel 3 1/4" and your speed of travel is the jack shaft speed (200 rpm) times this, which is 650 inches per min. This is based on a motor speed of 600 rpm.
Working backward, for every step of the motor you will travel:-
3 1/4" divided by 600 = 5.4 thou or .0054" which is your table resolution per step.
This is based upon a motor of 200 steps per rev, and a jackshaft reduction of 1:3
Ian. |