From: peter michaux <porkproducts@yahoo.com>

Hi Jerry,

I just read most of your website. Great stuff. I especially like the article
about servos versus steppers. The discussion of stepper skip is where my
main concern lies in purchasing stepper motors.

The system I am considering buying from Ah-ha (http://www.ahha.com/) has 450
oz-in steppers. Do you think this is enough torque? If I have higher torque
then stepper skip is less likely, correct? My feeds will be about 8 inches
per minute which is 80 revolutions per minute for the stepper motor. Perhaps
I should be up around 600-800 oz-in. Perhaps you could write an article on
motor selection.

The Ah-ha system also has limit switches to home the milling table incase
stepper skip has occured. This sounds like pseudo-feedback to me. How likely
is stepper skip and how often would you home? After every cut? I realize
this will take experimentation and experince but if you have a ballpark idea
I am interested in what you think.

Thanks again,
Peter