Circles aren't circles...

After a long hiatus, i'm back in the saddle trying to churn out awesome creations.  So i've upgraded to clearpaths, a new BOB for my ess and updated from VCon wheels to HGR20 linear rails and guides.  Everything was seemless transitioning over. 

So here is my dilemma... My circles are not circles, but something oblong... LOL  I will take pictures and upload them along with my gcode tonight, I just wanted to put this out there to see if anyone else has experienced the same.

I use Fusion360 for my CAD/CAM and noticed that a lot of updates have been applied from the last time I created gcode for a project.

I'll post up more info and some pics when I get home and take pics of my mach configs.

Thanks!

Ismael

Here are some configs and a recent job.

If the circles are displayed as being correct in the Mach3 Table Display screen then it is most likely a mechanical issue with your machine.
If, however, your circles are not displayed correctly then you need to check your CAD/CAM settings etc.

Also, post your problem Gcode.

Tweakie.

Here you go Tweakie!

I ran your Gcode here and the circles are comming out round & OK but I had to reduce your F1200 feedrate as my machine would not cut small circles at that speed (certainly not in acrylic) so perhaps that could be your issue also ?
Another thing is that it is not a good idea to have a G90 and G91 on the same line of Gcode.

Tweakie.

My clearpaths are capable of that feedrate for what i was cutting but will try and lower the feed rate.  They are configured for the x and y access for 6400 pulses per rev.  Not sure what is machs limitation is any when running clearpaths.

When you imply g90 and g91 shouldn’t be on the same line, im assuming i think line 3 is what you are referencing, correct?

Should the rest of the g90 that are on their own lines be be changed or just line 3?

Ill change some things and give it a try.

Thanks again Tweakie!!

Changed some configs after reviewing doc on ess from warp.  After that redid some gcode.

(1001)
(T5 D=2. CR=0. - ZMIN=-1. - FLAT END MILL)
G90 G94 G91.1 G40 G49 G17
G21
G28 G91 Z0.
G90

(2D CONTOUR1)
S16000 M3
G17 G90 G94
G54
G0 X11. Y6.
G43 Z15. H5
G0 Z5.
G1 Z-0.5 F250.
G3 X1. I-5. J0. F1000.
X11. I5. J0.
G1 Z-1. F250.
G3 X1. I-5. J0. F1000.
X11. I5. J0.
G0 Z5.
X6.566 Y15.674
G1 Z-0.5 F250.
G3 X5.566 I-0.5 J0. F1000.
X6.566 I0.5 J0.
G1 Z-1. F250.
G3 X5.566 I-0.5 J0. F1000.
X6.566 I0.5 J0.
G0 Z15.

M5
G28 G91 Z0.
G90
G28 G91 X0. Y0.
G90
M30

That attached pics were the results.  Checked my physical machine and no issues found.  Use AVID CNC r&p system with hgr20 linear guides/rails.  Might tuned down the clearpaths as i'm not sure what else to do.

Very hard to make sense of your JPGs. May be a setting somewhere? I get huge pics which would fill the screen several times over. Not enlightening for me.

Anyhow, there are other ways to mill holes, especially using a helix. The following has been extracted from a much-used program, and may have some excess. It make a single hole centered on 0,0. Most parameters can be changed as you wish. A cleaner bottom is easy to do.

#1=10.00         % diameter of hole
#2=4.00         % diameter of cutter
#3=[#1/2-#2/2]   % RADIUS for helix
#4=10.00         % Z thickness of material
#5=2.00         % Z cut depth per cycle
#6=fup[#4/#5]   % N(z) cycles to do
#7=[#5/#6]      % dZ increment per cycle
#8=0         % Z start on surface

g0 z40         % Z safe
g0 x#3 y0
g0 z#8         % touch surface
m98 p10 L#6      % do N(z) full helix circles
g0 x0 y0         % go to middle for safe exit
g0 z40         % exit straight up
m30

% Helix subroutine
o10
#8=[#8-#7/2]      % down
g3 x[0-#3] y0 z#8 r#3
#8=[#8-#7/2]      % down
g3 x#3 y0 z#8 r#3
m99

Cheers
Roger

I have resized the images so we can all see them 

Tweakie.

Hi Tweakie
Thanks.

To me, it could look like a bit of backlash: jigglies at two opposite points on the circle.
Or maybe something to do with the way the job is programmed: go down a bit, then go around a bit. But even so, it argues for backlash or bad flex.

Cheers
Roger