Re: EMC and Angular Axis to run rotary table

Been a while since I set up a rotary axis in EMC...

set type to linear, angular isn't implemented.
units.... May as well stick with 0.0393xx for input
scale, try 20. (20 steps = 1 degree)

The A should read in degrees. Bear in mind it will
not "wrap around" at 360. If you did 2 full turns it
will read 720 :) Be sure to open up the max and min limits
so it wont error out. Also the following error variables
will have to get much wider, as it sees this axis as very
coarse.

In my limited experience, I found it to be *very* sensitive
on coordinated moves. So much so that I would suggest only
move the A axis, then have another line to move X/Y/Z.

Hope this helps some.
-Damon

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude" <davemucha@j.
..> wrote:

>
> > > now my 4th axis ini parameters are as follows:
> > >
> > > ; Fourth Axis
> > > [AXIS_3]
> > >
> > > TYPE = ANGULAR
> > > UNITS = 0.03937007874016
> > > HOME = 0.000
>
>
> How did you get the units ?
> Assuming you are using degrees and not some other unit....
>
> If you have 360 degreees motion and the table turns 10 degrees per
> revolution ??
>
> a direct drive stepper on the shaft, no microstepping.
>
> 36 turns per revolution times 200 steps per revolution = 7,200

steps

> per 360 degrees or 0.05 degrees per step.
>
>
> = = = = = = = = =
>
> Here is a simple list of angular numbers for my spreadsheet.
>
> 360 table units (circle)
> 10 degrees per shaft revolution
> 36 handle revolutions per one table rev.
> 200 motor natural steps
> 1 microsteps (1= no microsteps)
> 200 actual; motor Step Per Rev
> 7200 steps per table rotation
> 360 table units (circle)
> 20 steps per degreee
> 0.05 degrees per step
>
> That comes out to 0.05 degrees per step.
> everything else being equal, an using your number, I get that you
> would need
>
> 7.874015748 degrees per shaft revolution
>
> Hope this gives you some point of reference.
>
> Dave