Re: stepper resolution

We used calculations to get relatively close, then a dial indicator
to fine tune. Load the travel on the indicator so when the table
moves it moves away from the dial, prevents running over dial. When
you get it, you can determine slack in the drive also. We used this
on an AHHA conversion on a Hercus mill.
Randy


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Graham Stabler" <eexgs@n...>
wrote:

> Can't be too much help but try dividing the actual distance by the
> wanted, it may provide a clue. e.g a simple example would be 0.5

if

> half step was selected and you thought it was full.
>
> Are they you a long way out? Are you sure of your TPI's and gear
> ratio?
>
> Another simple test. Set it to 800 steps per inch and jog an inch
> but take note of the position of the stepper shaft (use a little

mark

> on it). If it doesn't do a full rev, or does more, that is one

thing

> ruled out. You can continue doing the same experiment by just
> changing the number of pulses per inch to see if the leadcrew does
> one rev with the relevant number of pulses to the stepper.
>
> hope that is some help from one newbie to another
>
> Graham