Re: lost steps on deceleration

The proper settings are often tricky to set
reliably for all real world situations.
Load will make a difference here to.
I recommend to establish the max speed first using
a very conservative setting for acceleration to
ensure any fault will be caused by the max. setting.
When this value is found and recorded reduce the
value by about 10-20 percent for reliability.
Now try to establish your acceleration values using the
same principeles.
Yes most controllers use accel values for deceleration also.
Simulating some load durring testing may help to come up
with more realistic settings.
Always subtrakt a percentage for reliability when setting
the final values.

Note that temperature and lubrication vary a large degree
when operating a machine tool and will influence load on the
drive mechanism.
Good Luck

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
>
>
> terracnc wrote:
>
> >Hi everyone,
> >
> >If a stepper moves OK on acceleration and constant speed but lose
> >steps on deceleration, what is this symtomatic of? Is it the max.
> >speed too high, the aceleration (ramp?) set too high or too low,
etc.?
> >
> >
> How do you know the steps are lost on the deceleration part of the
move?
> Can you hear it clattering at the end? You obviously can't measure
it while
> it is in motion.
>
> Try the same move at half the speed and see if the result is the
same.
>
> Jon