HELP:radius to end differs from radius to start

Start
Prev
1
Next
End

ZeroLab
Offline
New Member

07 Oct 2014 15:00 - 07 Oct 2014 15:07 #51830 by ZeroLab

HELP:radius to end differs from radius to start was created by ZeroLab

I'm continously getting this error from a file I am generating with mastercamx

Radius to end of arc differs from radius to start:
start=(x15.5420,y1.3680)
center=(x15.6530,y1.1070)
end=(x15.5770,y1.3830) r1=0.368
r2=0.3738 abs_err=0.005674
rel_err=1.5180%

so i checked the gcode file and i think the problem is here somewhere

N8274 G2 X15.577 Y1.383 I.111 J-.351
N8276 X15.611 Y1.386 I.034 J-.165
N8278 X15.644 Y1.383 I0. J-.168
N8280 X15.922 Y1.132 I-.073 J-.361
N8282 G3 X15.95 Y1.096 I.06 J.018
N8284 G1 X16.277 Y.907
N8286 X16.286 Y.902
N8288 X16.29 Y.9
N8290 X16.293 Y.898
N8292 X16.295 Y.897
N8294 X16.307 Y.89
N8296 X16.304 Y.876
N8298 X16.301 Y.866

i was triyng figuring out how to change the radius but it seems not so simple.

Can anybody help me with it?

it would be very appreciated! :silly:

Last edit: 07 Oct 2014 15:07 by ZeroLab. Reason: couldn't get the attachment uploaded

Please Log in or Create an account to join the conversation.

emcPT
Offline
Platinum Member

07 Oct 2014 16:13 #51831 by emcPT

Replied by emcPT on topic HELP:radius to end differs from radius to start

The error is between line N8274 and the previous one. Can you post the previous line?

The following user(s) said Thank You: ZeroLab

Please Log in or Create an account to join the conversation.

ZeroLab
Offline
New Member

07 Oct 2014 18:33 #51840 by ZeroLab

Replied by ZeroLab on topic HELP:radius to end differs from radius to start

those are the previuos lines

N8262 G1 X15.524 Y1.352
N8264 X15.521
N8266 X15.512 Y1.354
N8268 X15.508 Y1.355
N8270 X15.525 Y1.362
N8272 X15.542 Y1.368
N8274 G2 X15.577 Y1.383 I.111 J-.351
N8276 X15.611 Y1.386 I.034 J-.165
N8278 X15.644 Y1.383 I0. J-.168
N8280 X15.922 Y1.132 I-.073 J-.361

Please Log in or Create an account to join the conversation.

emcPT
Offline
Platinum Member

07 Oct 2014 19:40 #51848 by emcPT

Replied by emcPT on topic HELP:radius to end differs from radius to start

The error is that for the machine to move from:

N8272 X15.542 Y1.368

to

N8274 G2 X15.577 Y1.383 I.111 J-.351

using that defined center is impossible as the length of the segment that goes from the center to the first point is different than the length of the segment from the center to the second point.

Two remarks: If this is programmed in mm (I do not know, you did not told), then this arc will almost be line a straight line, as its curve have a maximum distance from the line of about 0.0005mm, probably much less than your machine resolution.
If this was generated automatically by a CAM, probably you need to add more resolution in the output, more decimals as the rounding can be the problem.

Never less, if you change the second line from

N8274 G2 X15.577 Y1.383 I.111 J-.351

to

N8274 G2 X15.577 Y1.383 I.1269 J-.3444

The machine should understand this segment, but there is the possibility that fails in the next (or later) ones, as there are many arcs that probably will suffer from the same initial problem.

The following user(s) said Thank You: ZeroLab

Please Log in or Create an account to join the conversation.

ZeroLab
Offline
New Member

07 Oct 2014 20:34 #51851 by ZeroLab

Replied by ZeroLab on topic HELP:radius to end differs from radius to start

thank you again!!! you just solved my problem, now i'm trying to figure out how did you!!
again again
Thanks!

Please Log in or Create an account to join the conversation.

Start
Prev
1
Next
End

Time to create page: 0.066 seconds