Ian's original post to RH re TkBackplot

[Ray Henry <rehenry-at-up.net>]

List - a copy of post to RH attached nc file is included here.

X-From_: ian-at-iw63.freeserve.co.uk Thu Feb  3 12:12 EST 2000
From: "Ian Wright" <Ian-at-iw63.freeserve.co.uk>
To: <rehenry-at-up.net>
Subject: Re: TkBackplot 1.0.1
Date: Thu, 3 Feb 2000 17:12:56 -0000
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 5.00.2014.211
X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2014.211

Hi Ray,

I have been playing with backplot and have found a problem which I don't
understand. Since it may point to a problem within the program, it may be
worth you looking at and commenting on. I tried to run the attached file
which is G-code produced from a .dxf file using Flashcut and it all seemed
to run OK until it hit the line which I have commented. At this point it
gave an error message which was, I think, 'zero following error' or
'following error line zero' ( I can't remember exactly and I'm not near the
linux machine at the moment). At the same time, all the axes began to
increment rapidly and I couldn't find a way to stop them. 'Abort' seemed to
do nothing and 'Estop' whilst producing a message to say that it had been
implemented, didn't stop the counters incrementing. Presumably, if this
happened on a real machine, the cutting head would simply hurtle off until
it wrapped itself around an end pillar or ground itself into the machine bed
and the operator would not be able to stop it doing so. The effect is the
same whether I use the original version of Backplot or the new one with 3d
(which is very impressive).
There could, of course, be some problem with the file - I have no experience
yet of using g-code and I'm just trying to get a feel for it, but it is the
inability to stop things happening that worries me. Thanks.

Ian
--
Ian W. Wright
Sheffield  UK

nc program file here
--------------------
(File created using FlashCut CNC DXF Import)
(Import File:  PLATE.DXF)
(Import Date:  31/01/2000)

G00 Z 0.2500
G00 X-1.9967 Y 0.1151
G01 Z-0.1000 F 1.00
G01 X-1.9967 Y 0.1151 F 5.00
G03 X-3.0000 Y 0.5000 I-1.0033 J-1.1151
G02 X-1.9967 Y 0.1151 I 0.0000 J-1.5000
G03 X-3.0000 Y 0.5000 I-1.0033 J-1.1151
G03 X-1.5283 Y-1.2901 I 0.0000 J-1.5000
G02 X-3.0000 Y 0.5000 I-1.4717 J 0.2901
G03 X-1.5283 Y-1.2901 I 0.0000 J-1.5000
G01 X-1.5283 Y-1.2901
G00 Z 0.2500
G00 X-1.5283 Y-1.2901
G01 Z-0.1000 F 1.00
G03 X 0.0000 Y 2.0000 I 1.5283 J 1.2901 F 5.00
G02 X 1.8775 Y 0.6892 I-0.0000 J-2.0000
G01 X 1.8775 Y 0.6892
G01 X 2.0000 Y 0.7000
G02 X 1.8775 Y-0.6892 I 0.0000 J-0.7000
G03 X 2.0000 Y 0.7000 I 0.1225 J 0.6892
G02 X 1.8775 Y-0.6892 I 0.0000 J-0.7000
G02 X-1.5283 Y-1.2901 I-1.8775 J 0.6892
G00 Z 0.2500
G00 X-1.7321 Y-1.0000
G01 Z-0.1000 F 1.00
G01 X-4.5000 Y-1.0000 F 5.00
G01 X-4.5000 Y-1.0000
G00 Z 0.2500
G00 X-4.1180 Y 0.0000
G01 Z-0.1000 F 1.00
G01 X-5.0000 Y 0.0000 F 5.00
G01 X-5.0000 Y 0.0000
G01 X 5.0000 Y 0.0000
G02 X 5.0000 Y 0.0000 I-5.0000 J 0.0000         ########## Here Backplot
flips and takes off at high speed! ####
G01 X 2.7000 Y 0.0000
G01 X 2.7000 Y 0.0000
G01 X 2.0000 Y 0.0000
G02 X 2.0000 Y 0.0000 I-2.0000 J 0.0000
G01 X-2.0000 Y 0.0000
G00 Z 0.2500
G00 X-1.9967 Y 0.1151
G01 Z-0.1000 F 1.00
G02 X 0.0000 Y 2.0000 I 1.9967 J-0.1151 F 5.00
G03 X-1.9967 Y 0.1151 I-0.0000 J-2.0000
G00 Z 0.2500
G00 X-2.3455 Y 0.3497
G01 Z-0.1000 F 1.00
G01 X-2.3455 Y 0.3497 F 5.00
G00 Z 0.2500
G00 X-1.8775 Y 0.6892
G01 Z-0.1000 F 1.00
G03 X-1.8775 Y-0.6892 I 1.8775 J-0.6892 F 5.00
G00 Z 0.2500
G00 X-3.0000 Y 0.5000
G01 Z-0.1000 F 1.00
G01 X-3.0000 Y 0.5000 F 5.00
G01 X-3.0000 Y-2.5000
G01 X-3.0000 Y-2.5000
G00 Z 0.2500
G00 X 0.0000 Y-2.0000
G01 Z-0.1000 F 1.00
G01 X 0.0000 Y-5.0000 F 5.00
G01 X 0.0000 Y-5.0000
G01 X 0.0000 Y 5.0000
G01 X 0.0000 Y 5.0000
G01 X 0.0000 Y 2.0000
G01 X 0.0000 Y 2.0000
G01 X 0.0000 Y-2.0000
G00 Z 0.2500
G00 X 0.0000 Y-2.0000
G01 Z-0.1000 F 1.00
G01 X 0.0000 Y-2.0000 F 5.00
G00 Z 0.2500
G00 X 1.5283 Y-1.2901
G01 Z-0.1000 F 1.00
G03 X 1.9967 Y 0.1151 I-1.5283 J 1.2901 F 5.00
G00 Z 0.2500
G00 X 2.0000 Y 0.7000
G01 Z-0.1000 F 1.00
G01 X 2.0000 Y 0.7000 F 5.00
G01 X 1.8775 Y 0.6892
G01 X 2.0000 Y 0.7000
G00 Z 0.2500
G00 X 2.2013 Y 0.6704
G01 Z-0.1000 F 1.00
G01 X 2.2013 Y-0.6704 F 5.00
G00 Z 0.2500
G00 X 2.0000 Y-0.7000
G01 Z-0.1000 F 1.00
G01 X 2.0000 Y-0.7000 F 5.00
G00 Z 0.2500
G00 X 1.8775 Y-0.6892
G01 Z-0.1000 F 1.00
G01 X 1.8775 Y-0.6892 F 5.00
G00 Z 0.2500
G00 X 0.0000 Y 0.0000