RE: [CAD_CAM_EDM_DRO] EMC setup questions

AW,

You might want to try a MAX_VELOCITY setting of 5 which should give you
300mm / minute. The calculation that I have found works for me for
MAX_VELOCITY is IPM / 60 so in my case 12 / 60 = .2 which gives me 12 IPM
rapids on my Sherline with the small motors I am running. The calculation I
gave you would be 300 / 60 = 5 for MAX_VELOCITY that would give you 300mm /
minute.

John Guenther
Sterling, Virginia

> -----Original Message-----
> From: awallin25 [mailto:anders.wallin@...]
> Sent: Saturday, October 12, 2002 11:15
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] EMC setup questions
>
>
> Hi All,
>
> Thanks for all the answers to my previous questions. I have now got my
> system up and running with EMC.
> I am still looking for the right settings to get my units correct:
> Now EMC works in mm and shows mm on the screen, but my table moves
> lots more than 1mm when commanded to move 1mm. This is when I have
> input_scale=1000 and the emc-gui shows a feedrate of around 20-60
> units?/s
>
> I am using steppermod.o
>
> I have linear_units =1
>
> I have tried to calculate input_scale as follows:
> my steppers are 200step/rev driven with halfs steps => 400steps/rev
> my ballscrews give me 5mm movement for every rev.
> => input_scale should be 80 ??
>
> when I set input_scale to 80 on one axis for testing it, it seems to
> work when jogging in the + direction, but I immediately get a
> following error when pressing the - button.
> The FAQ tells me to reduce feedrate when this happens. I have
> max_velocity set to 20 on all axes.
> If I understand correctly the parallell port whould be able to do
> around 5 kHz which would be equivalent to a feedrate of over 60mm/sec
> on my system (5000steps/s / 400 steps/rev * 5 mm /rev > 60 mm/s)
> even with a very low feredrate I get the following error when trying
> to move in the - direction.
>
> thanx for any help,
>
> AW
>
>
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