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Error msg loading G-code
« on: December 15, 2010, 09:01:24 AM »
Pardon the newbie question, but I can't figure out why I get the error msg, "Tool Radius greater than approachLine 1", when I load this G-code:

G91.1  G17  G41 P0.250 F10
G1 Z1.0000
M30

I presume I'm being warned of a collision problem, but I can't figure out why.

TIA

Charley

Offline Graham Waterworth

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Re: Error msg loading G-code
« Reply #1 on: December 15, 2010, 09:07:01 AM »
You have to apply the G41 on a feed line e.g. G01 G41 X10. P.25

Graham
Without engineers the world stops
Re: Error msg loading G-code
« Reply #2 on: December 15, 2010, 10:09:16 AM »
Graham:

I've been enlightened  ;D
Thanks!

Charley
Re: Error msg loading G-code
« Reply #3 on: December 15, 2010, 11:09:10 AM »
I wonder if I can't get a little more education.  With the tool at X0 Y0, this works fine:

G01 G41 X-1 P.25

but this produces the tool radius error message again:

G01 G41 X-2 P.25

Charley

Offline Graham Waterworth

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Re: Error msg loading G-code
« Reply #4 on: December 15, 2010, 05:50:25 PM »
what are you trying to do, using G41/42 is not a simple one line command there is more to it than that.  Post a sketch of what you want to machine then we can tell you how to proceed.

Graham
Without engineers the world stops

Offline ger21

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Re: Error msg loading G-code
« Reply #5 on: December 15, 2010, 06:19:55 PM »
As Graham stated, you need at least two lines of g-code to use G41. And that's before you even start to cut your part. You should be moving to a specified position before calling the G41. The comp is applied during the move from that point to the next one.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: Error msg loading G-code
« Reply #6 on: December 16, 2010, 02:05:24 PM »
I appreciate the offers of assistance.

I'm trying to make a fairly simple part - cutting a roughly 2"x3" rectangle (more or less) out of sheet brass.  One side has rounded corners, and the other is completely round.  Top and bottom are straight.  I'm frustrated at the results, not just with the error msg.

Here's one of many versions of G-code that I've tried:

N010  G91.1  G17
N020  G1  G41 X0.1  P0.125
N030  G1  Z+0.0500
N040  G1  X+0.0000  Y+1.1111
N050  G1  Z-0.0050
N060  G2  X+0.0000  Y-1.1111  I0     J-1.1111
N070  G1  Z+0.0500
N080  G1  X+1.0000  Y-0.9675
N090  G1  Z-0.0050
N100  G1  X-1.7500  Y-0.9675
N110  G2  X-2.0000  Y-0.7175    I0     J0.25
N120  G1  X-2.0000  Y+0.7175
N130  G2  X-1.7500  Y+0.9675  I0.25  J0
N140  G1  X+1.0000  Y+0.9675
N150  G1  Z+0.0500
N160  M30

Line N020 is a dummy that I've had to throw in to get rid of the error msg.

I don't know where the top and bottom intersect the arc, so I try to cut them separately.  Mach3 doesn't seem to want to do this.  When I run this code, it cuts the N040-N060 arc, but then goes to X-500 somewhere, rather than X+1.000.  It cuts the rest of the bottom, side and corners correctly, but then stops on the top in the X_500 area.  I'm sure it's trying to help, but I don't understand how to control it.

Charley

Offline Graham Waterworth

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Re: Error msg loading G-code
« Reply #7 on: December 16, 2010, 02:15:50 PM »
Here are a few help sheets I did for the chaps at work, it gives examples of how to do some basic g-code programs to do simple jobs, its all in metric but the principals are the same.

Graham
 
Without engineers the world stops
Re: Error msg loading G-code
« Reply #8 on: December 16, 2010, 03:18:18 PM »
Graham:

Thanks!  I'll be studying it in detail this evening.

Charley

Offline ger21

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Re: Error msg loading G-code
« Reply #9 on: December 16, 2010, 06:20:02 PM »
Not sure if you wanted that "trapezoidal" shape. I changed it to a more rectangular shape with parallel sides.
Try this.

N010  G91.1  G17
N011  G0  Z0.05
N012  G0  X-.5 Y1.3 (Move to start of lead-in)
N013  G41 P0.125
N020  G1  X-0.1 Y1.1111 Z-.05 (Ramp Down While applying comp)
N040  G1  X+0.0000  Y+1.1111
N060  G2  X+0.0000  Y-1.1111  I0     J-1.1111
N100  G1  X-1.7500  Y-1.1111
N110  G2  X-2.0000  Y-0.8611    I0     J0.25
N120  G1  X-2.0000  Y+0.8611
N130  G2  X-1.7500  Y+1.1111  I0.25  J0
N140  G1  X+1.0000  Y+1.1111
N150  G1  Z+0.0500
N155  G40
N160  M30
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html