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Author Topic: Position Errors Only on Diagonal Moves  (Read 17117 times)

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Re: Position Errors Only on Diagonal Moves
« Reply #30 on: January 15, 2015, 11:20:43 AM »
Hi Nate,
Back plotting your code, I see that the lead in/out looks a bit peculiar.

I wonder if that might be contributing ?
Maybe adjust the code and run the same profiles but without any leadins/outs ?

Just a guess, ::)
Russ
 :)
Re: Position Errors Only on Diagonal Moves
« Reply #31 on: January 15, 2015, 11:23:08 AM »
Russ,

That's the transition between the roughing and finishing passes.  The actual lead-in and lead-out are just straight Z moves.

Regards,
Ray L.
Regards,
Ray L.
Position Errors Only on Diagonal Moves
« Reply #32 on: January 15, 2015, 11:31:14 AM »
Running your Gcode, using a laser, the centreline of the toolpath produces a 1.2" square on the first pass and a 1.25" square on the second pass. Both the X-Y aligned square and the 45 deg. square are absolutely identical in dimension - there is no error.

So I think I can safely say there is absolutely nothing wrong with your Gcode or the Mach3 interpretation of that Gcode.

Hope this helps in finding your problem.

Tweakie.

Tweakie,

I am inclined to agree with you, especially after I:
  - took a known good control computer from another machine and upon hooking it to the mill it produced the same off results.
  - rebuilt the configure file from a pristine manufacturers file and a second time from scratch and still got the same off results.
  - get the same results using the PP or a UC100

My only question is, what do I check now?


Nate
Fine Line Automation
www.finelineautomation.com
Re: Position Errors Only on Diagonal Moves
« Reply #33 on: January 15, 2015, 11:43:23 AM »
Ray,
 Watching this run Single Step, you can see that the rough pass plunges straight in, but it stays at depth and does the S shaped lead in to the finish pass.
If I see it right.
Russ

Offline Tweakie.CNC

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Re: Position Errors Only on Diagonal Moves
« Reply #34 on: January 15, 2015, 11:55:54 AM »
Hi Nate,

It beats me but I think you have ruled out everything but your machine electrical's and the tuning of your servo's.
Are all your voltages correct and being maintained during the run ? - Are all your electrical connectors truly sound ?

Tweakie.
PEACE
Re: Position Errors Only on Diagonal Moves
« Reply #35 on: January 15, 2015, 12:30:21 PM »
Ray,
 Watching this run Single Step, you can see that the rough pass plunges straight in, but it stays at depth and does the S shaped lead in to the finish pass.
If I see it right.
Russ

Russ,

Yes, that is exactly right.

Regards,
Ray L.
Regards,
Ray L.
Re: Position Errors Only on Diagonal Moves
« Reply #36 on: January 15, 2015, 12:35:21 PM »
Thanks Ray
Ok, I'm curious ....  just 1 more and I'll stay out ..
You've had this machine about a year, and has it ever run any decent parts?
Any diag. interpolated move is trash?
I see it stated where CAM and hand coding does the same.
Did you try a simple point to point rotated square pattern of 4 holes maybe ?
Start at X0,Y0

X1
hole
X0 Y1
hole
X-1 Y0
hole
X0 Y-1
hole

Then measure.

Just wondering if you tried something this simple as a test  ?
This would maybe eliminate some possibilities.
Russ
Re: Position Errors Only on Diagonal Moves
« Reply #37 on: January 15, 2015, 12:44:21 PM »
Hi Nate,

It beats me but I think you have ruled out everything but your machine electrical's and the tuning of your servo's.
Are all your voltages correct and being maintained during the run ? - Are all your electrical connectors truly sound ?

Tweakie.

It has AC servos, powered directly off the 220VAC line, so supply power is not an issue.

What baffles me is it would have to be a problem in BOTH the X and Y drives as both are going to the wrong position.  But what would cause it to only happen on coordinated moves?

Very odd problem indeed....

Regards,
Ray L.
Regards,
Ray L.

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Re: Position Errors Only on Diagonal Moves
« Reply #38 on: January 15, 2015, 01:50:50 PM »
Ray did you measure the Square from corner to corner to check for square or just side to side ??

Have you tried a SIMPLE test with just the basic moves . only one cut, no finish cuts,No offseting , no tool changing etc?

G20 (Units: Inches)
G40 G90 G91.1 G49 G80
F1
(Part: TestSquare)

G0 Z1.000
G00 X0.8839 Y0.0000
G01 Z-0.010 F10.0

X0.0000 Y0.8839 F17.0
X0.8839 Y1.7678
X1.7678 Y0.8839
X0.8839 Y0.0000

G00 Z0.5000
X3.4008 Y0.8839

G01 Z-.010 F10.0
Y0.2589 F17.0
X2.1508
Y1.5089
X3.4008
Y0.8834
G00 Z0.5000
M05 M30

Offline BR549

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Re: Position Errors Only on Diagonal Moves
« Reply #39 on: January 15, 2015, 02:19:53 PM »
Then one more test to change the way it is programmed.

(TestSquare2.txt)
G20 (Units: Inches)
G40 G90 G91.1 G49 G80 G69
F1
(Part: TestSquare)
G00 Z1.000
G00 X0.000 Y0.000
G00 Z0.010

G01 Z-.010 F10.0
G91
G1 X2.000  F20
Y2.000
X-2.000
Y-2.000
G90
G00 Z0.5000

G91
G00 X4
G90
G68  R45

G90
G1 Z-.010 F10
G91
G1 X2.000  F20
Y2.000
X-2.000
Y-2.000
G90
G0 Z0.5000

G69
G0X0.000 Y0.000
M05 M30