Triton Tool Offsets

All info relating to the Denford Triton and Triton Pro milling machines. (Project Lead the Way)

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Benny
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Triton Tool Offsets

Post by Benny » Thu 25 Jan , 2007 17:30 pm

Customer Question:
Triton with Pneumatic Vise
VR CNC Milling 2.31

I am trying to set up my tool offsets for 2 different tools. My 1st tool is an 1/16" engraver bit and I have run an engraving program perfect. My second operation I would like to perform is a facing operation. I would like to use a 1/2" end mill for this. I have set up a 1/2" end mill in the tooling button as the second tool. I have also set up the z offsets for both tools from the table in the mill with a global offset of 1.5 which is my billet thickness. When I run my facing program and it gets to this line (G43 Z0.25 H02 M7) It says move limits exceeded. I have followed the setting offsets for multiple tools in the VR CMC Milling User's manual. I have also tried the technical articles on your web site, and the forums. None of it helps.

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Post by Denford Admin » Thu 25 Jan , 2007 17:44 pm

G43 was not fully implemented - I've looked at the code and it was only available for advanced users (something that never made it to final product)
So, I suspect the G43 is the problem - do you really need to alter the tool Z offset from within the CNC program ?

What are you trying to achieve by changing the tools' Z offset ?

What is generating your CNC programs ?

Can you send the program ?

goonies
Posts: 8
Joined: Thu 25 Jan , 2007 18:31 pm

EdgeCAM 10.75

Post by goonies » Mon 29 Jan , 2007 14:05 pm

I am using EdgeCAM 10.75 which is used by Project Lead the Way to teach CAM. I am attaching two different codes that I have generated using EdgeCAM the one entitled PLTWengrave1-29-07.fnc works just fine. The one entitled facingnew.fnc stops at G43 Z0.25 H02 M7. What I don't understand is this line is in both codes and one works and one doesn't. I don't know why I am alter the Z offset, this is what EdgeCAM generated. Please help!

goonies
Posts: 8
Joined: Thu 25 Jan , 2007 18:31 pm

attachments

Post by goonies » Mon 29 Jan , 2007 14:07 pm

I don't think the attachments worked right, so I have copy the PLTWengrave1-29-07.fnc code into this post.

PLTWengrave1-29-07.fnc

( Machine Tool : Denford Mill
( Part Name : blue wax
( Programmed By : MR. HARRELL
( Date : 01/29/07
( Time : 07:36:19
( Total Machining Time including Toolchange : 1.620 Minutes
G20
[TOOLDEF T00 D0.25
(USER DEFINED)
T0000 M6
G90 G0 X0.2416 Y1.2717
G43 Z0.25 H00 M7
G1 Z-0.002 F10.0 S1100
X0.2394 Y1.2719 Z0.0 F20.0
X0.2416 Y1.2717 Z-0.002
X0.244 Y1.2686
X0.2435 Y1.2664 Z0.0
X0.244 Y1.2686 Z-0.002
G17 G2 X0.2685 Y1.28 R0.1889 F25.0
X0.3001 Y1.2854 R0.0846 F20.0
G1 Y1.2837 Z0.0
Y1.2854 Z-0.002 F10.0
G2 X0.3448 Y1.2733 R0.0797 F20.0
G1 X0.3439 Y1.2719 Z0.0
X0.3448 Y1.2733 Z-0.002 F10.0
G2 X0.3612 Y1.261 R0.0888 F20.0
X0.3731 Y1.2437 R0.0513
G1 X0.3716 Y1.243 Z0.0
X0.3731 Y1.2437 Z-0.002 F10.0
G2 X0.3808 Y1.2163 R0.0686 F20.0
X0.3816 Y1.1888 R0.3726 F25.0
G1 Y1.1608 F20.0
X0.282 Y1.0964
X0.2811 Y1.0978 Z0.0
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G2 X0.2399 Y1.0711 R0.3203 F25.0
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M30

goonies
Posts: 8
Joined: Thu 25 Jan , 2007 18:31 pm

facingnew.fnc

Post by goonies » Mon 29 Jan , 2007 14:08 pm

Facingnew.fnc code

( Machine Tool : Denford Mill
( Part Name : blue wax
( Programmed By : MARK
( Date : 01/25/07
( Time : 13:03:03
( Total Machining Time including Toolchange : .175 Minutes
G20
[TOOLDEF T00 D0.5
(FACE MILL OPERATION)
(USER DEFINED)
T0000 M6
S5000 M3
G90 G0 X8.05 Y2.0667
G43 Z0.25 H00 M7
Z0.15 F550.04
G1 Z-0.05 F244.46
X3.05 F550.04
X-0.05
G17 G3 X-0.1125 Y2.0042 R0.0625
G1 Y1.8958
G3 X-0.05 Y1.8333 R0.0625
G1 X3.05
G2 X3.1125 Y1.7708 R0.0625
G1 Y1.6625
G2 X3.05 Y1.6 R0.0625
G1 X-0.05
G3 X-0.1125 Y1.5375 R0.0625
G1 Y1.4292
G3 X-0.05 Y1.3667 R0.0625
G1 X3.05
G2 X3.1125 Y1.3042 R0.0625
G1 Y1.1958
G2 X3.05 Y1.1333 R0.0625
G1 X-0.05
G3 X-0.1125 Y1.0708 R0.0625
G1 Y0.9625
G3 X-0.05 Y0.9 R0.0625
G1 X3.05
G2 X3.1125 Y0.8375 R0.0625
G1 Y0.7292
G2 X3.05 Y0.6667 R0.0625
G1 X-0.05
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G1 Y0.4958
G3 X-0.05 Y0.4333 R0.0625
G1 X3.05
G2 X3.1125 Y0.3708 R0.0625
G1 Y0.2625
G2 X3.05 Y0.2 R0.0625
G1 X-0.05
X-5.05
G0 Z0.25
M30

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Denford Admin
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Post by Denford Admin » Tue 30 Jan , 2007 9:51 am

It seems like the G43 is causing some random problems as its not a supported G code - happens in VR Milling 5 as well.

I think your best bet is to alter the Edgecam postprocessor to get rid of the G43 command - I can't see why it would be necessary. You may need to contact them on how to do this.

I believe this (attached below) is the Denford post we supply with the F1 In Schools edgecam - might be worth a try -
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Denford.mcp
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Post by goonies » Tue 30 Jan , 2007 16:18 pm

That worked perfectly, that Denford post I mean, but is there any way to switch it to english for the units instead of metric??

Thanks

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Post by Denford Admin » Tue 30 Jan , 2007 16:27 pm

I haven't used EdgeCAM before, so I can't help much.

Have a google for "EdgeCAM Code Wizard" seems like its some kind of easy post-processor configuration wizard.
I would have thought that you could load up the denford.mcp file somewhere in EdgeCAM, and change some settings (eg, what units to output)

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another question

Post by goonies » Tue 30 Jan , 2007 16:56 pm

Why when I get to this line of code G17 G2 X12.311 Y17.759 R2.224 does virtual machine say radius: bad arc end point?

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Post by Denford Admin » Tue 30 Jan , 2007 21:37 pm

I'd need to know the previous X and Y move positions in order to see what the problem is.

Bad arc end point normally occurs because the post processor has rounded up some numbers and rounded down others.
The result is that an arc cannot be created accurately from the given start point (previous XY position), end point(G2/3 position) and radius (R).

I'm pretty sure that the later versions of VR Milling are more forgiving over arc checks, whereas version 2 milling will generate an error even if the arc end point is out by 1 micron (4 tenths")

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code

Post by goonies » Wed 31 Jan , 2007 13:39 pm

Thanks for your help so far, I really appreciate it!

There is the code up to that line. Is there a quick fix for the post processor to mend this problem?

(EDGECAM CNC OUTPUT - F1 IN SCHOOLS.MCP)
(01/30/07)
(Denford Micro Router)
(MARK)
G21
[TOOLDEF T00 D6.35
[EDGEMOVE X0 Y0
G91 G28 X0 Y0 Z0

M06 T00 (USER DEFINED)
G43 H00
S1100 M3
G1 X9.181 Y35.746 Z5.0 F508.0
Z-0.187 F254.0
Y17.799 F508.0
X11.859
G17 G2 X12.311 Y17.759 R2.224
X12.767 Y17.514 R0.867
X13.035 Y17.197 R1.08
X13.144 Y16.758 R0.865
X13.039 Y16.314 R0.915
X12.754 Y15.973 R1.046
X12.283 Y15.777 R0.932
X11.859 Y15.754 R3.303

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Post by Denford Admin » Wed 31 Jan , 2007 17:54 pm

If you have worked out how to alter the post processor in EdgeCAM, then I would try changing it to:

1. Output arcs using relative centre points (eg, I J values) rather than just radius. eg, G17 G2 X10 Y12.5 I-2 J-3
2. See if you can change any settings to do with minimum arc size - from what I can see from your program, the post has created a tiny arc which is very nearly a straght line.

If you can make these changes, then you could also set it back to imperial units

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