Re: G-code help

["Hassan Rabe" <rabeh-at-student.gvsu.edu>]

Thanks Ray,
I guess there were something wrong with that code.
I changed the code because it was not working as is, but when I changed it I
forgot that I am in the
absolute mode. but the intention from the replicate G03 is to make two
circles.
so the original code (that worked just fine on a commercial machine with GE
Fanuc controller) was
G03 I-1.9685 J0
as io told you ...the intention is to make a CCW circle that begins and ends
in the same place
and the reason that am using this method ( not simple four arcs) is because
am testing the same machine with different controllers;
the original one that comes with the machine, and the EMC, using a Ballbar
that I got from Renishaw Inc.
so by using a four arcs instead of full connected circle, I will get a fault
results of maybe a backlash or reversal spikes.
Does the EMC accept the code above???...I tried it ...but it did not work,
so, I thought that there must be an X and a Y  values...so I added a zero
values...forgetting that its an absolute mode..
my Question again...does EMC accepts the code above

Hassan

----- Original Message -----
From: "Ray Henry" <rehenry-at-up.net>
To: "Multiple recipients of list" <emc-at-nist.gov>
Sent: Monday, September 16, 2002 11:02 PM
Subject: Re: G-code help


>
>
> Hassan
>
> I set debug level in the ini as below and started the EMC in a terminal
> so that I could read the feedback.
>
> ; Debug level, 0 means no messages. See emc/src/emcnml/emcglb.h for others
> ; DEBUG =                 0x00000003
> DEBUG =               0x7FFFFFFF
>
> When I ran your program, this is what I got.
>
> [
> emcTaskPlanLine() returned 8
> emcTaskPlanCommand(G03 X0.0 Y0.0 I-1.9685 J0) called. (line_number=8)
> emctask.cc 245: rs274ngc_error: Radius to end of arc differs from radius
> to start
> Radius to end of arc differs from radius to start
> rs274ngc_stack:          - arc_data_ijk  - convert_arc2  - convert_arc  -
> convert_motion  - convert_g
> ]
>
> You will notice that in your file this was line 7.  I added a comment
> line to the beginning of the text.
>
> (Hassan's program that doesn't work for him)
> > G90
> > G17
> > F10
> > G01 X-2.0275 Y0.0 Z0.0
> > M00
> > G01 X-1.9685 Y0.0
> > G03 X0.0 Y0.0 I-1.9685 J0
> > G03 X0.0 Y0.0 I-1.9685 J0
> > G01 X-2.0275 Y0.0
> > M00
> > G01 X-1.9685 Y0.0
> > G02 X0.0 Y0.0 I-1.9685 J0
> > G02 X0.0 Y0.0 I-1.9685 J0
> > G01 X-2.0275 Y0.0
> > M30
>
> When you begin line seven you are at -1.9685 in x and you want to create
> an arc that ends at 0.  In order to do that, the radius, in this case (I)
> would have to be 1/2 the distance to the end point or  0.98425.  Notice
> that since you are minus and you want to move positive to zero the (I)
> has to point in the positive direction.
>
> When you begin line eight you are at 0 in x so if you want to continue
> the arc into a full circle you would need to edit both the endpoint in x
> and the (I) value as follows.
>
> g3 x-1.9685 y0 I--0.98425 j0
>
> Notice again that since you are at zero and you want to go minus to
> -1.9685 the I value now has to point in the minus direction.
>
> A similar edit has to be performed for the second pair of arcs.  My best
> guess at what you wanted is
>
> (Ray's remodel of Hassan's program)
> G90
> G17
> F10
> G01 X-2.0275 Y0.0 Z0.0
> (M00)
> G01 X-1.9685 Y0.0
> G03 X0.0 Y0.0 I 0.98425 j0
> G03 X-1.9685 Y0.0 I -0.98425 j0
> G01 X-2.0275 Y0.0
> (M00)
> G01 X-1.9685 Y0.0
> G02 X0.0 Y0.0 I 0.98425 J0
> G02 X-1.9685 Y0.0 I-0.98425 J0
> G01 X-2.0275 Y0.0
> M30
>
> Notice also that I commented out the m00's so that I didn't have to keep
> pressing s.  I believe that this ran for me here and made the same circle
> twice once counterclockwise and once clockwise.
>
> If you had some other geometry in mind, get back to us.
>
> Ray
>
>
>
>