Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: Tomashi on May 21, 2022, 03:57:38 AM

Title: MACH 3 M6 modifies Z in the G54
Post by: Tomashi on May 21, 2022, 03:57:38 AM

Hi.
The issue is that  MACH 3 modifies the Z-value in the G54 when I change tool.
I strongly think it is due to the M6, but I'm not (yet) understanding the code in the M6.

This is what I do:
I use Mach3 on a router with ATC
I use Fusion 360 for the CAM and post

Example:
I have designed a part using 2 tools, T1 and T2

I set the tool offset in Mach 3 by touching the top of the stock with both T1 and T2
I set the G54 at the top of the stock

When I start the program I have the T1 in the spindle, it machines fine
When the machine goes to change the tool I see that the G54 Z-value is changed. Why?

Title: Re: MACH 3 M6 modifies Z in the G54
Post by: Tomashi on May 21, 2022, 05:52:37 AM

First time in this forum so the post went off quickly.
New try

So Hi.
The issue is that the Z-value in the G54 is changed when I change tool by the ATC.
I strongly think it is due to the M6, but I'm not (yet) understanding the code in the M6 well enough.

This is what I do:
I use Mach3 on a router with ATC
I use Fusion 360 for the CAD/CAM and post processing

Example when the issue occures:
I have designed a part using 2 tools, T1 and T3, the G-code is below.
I set the tool offset by touching the top of the stock with both T1 and T3.
Positive values are used on the tool offsets.
My Z-axis is set up to be positive going up from the table.
I set the G54 at the top of the stock. My Z-value is always negative, as an example -115mm.

When I start the program I have the T1 in the spindle, and I have choosen tool 1 in Mach3
It machines fine.

When the machine goes to change the tool I see live while looking at the G54 that the Z-value is changed.

Below is the G-code and I have indicated the precise line when the change in Z in the G54 occures

The new Z-value seems to be very random, it can be a reasonable -30 but also a stupid +150.

As said before that I think it is the M6 code causing the problem, but as the new Z-value seems random I wonder if it might be something else.

Example my computer seems slow or something else is wrong? I say that because when I look on the DRO and push the button switch between Machine coordinates and Local coordinates it is not updating the position XYZ always.

Long message but please help!!!

Below the G-code and the M6 start and stop.


G-code:
(1001)
(T1  D=8. CR=0. - ZMIN=-20. - FLAT END MILL)
(T3  D=5. CR=0. - ZMIN=-20. - FLAT END MILL)
G90 G94 G91.1 G40 G49 G17
G21

(2D CONTOUR2)
M5
T1 M6
S5000 M3
G54
G0 X-21.415 Y-1.669
G43 Z15. H0
Z5.
G1 Z1. F333.
Z-19.2
X-21.408 Z-19.304 F1000.
X-21.388 Y-1.67 Z-19.407
X-21.354 Z-19.506
X-21.308 Y-1.671 Z-19.6
X-21.25 Y-1.673 Z-19.687
X-21.181 Y-1.674 Z-19.766
X-21.102 Y-1.676 Z-19.835
X-21.015 Y-1.677 Z-19.893
X-20.921 Y-1.679 Z-19.939
X-20.822 Y-1.681 Z-19.973
X-20.72 Y-1.683 Z-19.993
X-20.615 Y-1.686 Z-20.
X-19.815 Y-1.702
G3 X-18.999 Y-0.918 I0.016 J0.8
G2 X-17.646 Y2. I3.999 J-0.082
X-19. Y5. I2.646 J3.
G1 Y15.
G2 X-15. Y19. I4. J0.
G1 X15.
G2 X19. Y15. I0. J-4.
G1 Y-15.
G2 X15. Y-19. I-4. J0.
G1 X-15.
G2 X-19. Y-15. I0. J4.
G1 Y-1.
X-18.999 Y-0.918
G3 X-19.783 Y-0.102 I-0.8 J0.016
G1 X-20.583 Y-0.086
X-20.687 Y-0.084 Z-19.993
X-20.79 Y-0.082 Z-19.973
X-20.889 Y-0.08 Z-19.939
X-20.982 Y-0.078 Z-19.893
X-21.069 Y-0.076 Z-19.835
X-21.148 Y-0.074 Z-19.766
X-21.217 Y-0.073 Z-19.687
X-21.275 Y-0.072 Z-19.6
X-21.321 Y-0.071 Z-19.506
X-21.355 Y-0.07 Z-19.407
X-21.376 Z-19.304
X-21.382 Z-19.2
G0 Z15.

(2D CONTOUR3)
M5
T3 M6
S5000 M3                                             The G54 change in Z occures on this line!!!
G54
G0 X-17.161 Y1.597
G43 Z15. H0
Z5.
G1 Z1. F333.
Z-19.5
X-17.156 Y1.603 Z-19.587 F1000.
X-17.141 Y1.62 Z-19.671
X-17.118 Y1.648 Z-19.75
X-17.086 Y1.687 Z-19.821
X-17.047 Y1.735 Z-19.883
X-17.001 Y1.79 Z-19.933
X-16.951 Y1.851 Z-19.97
X-16.898 Y1.915 Z-19.992
X-16.842 Y1.982 Z-20.
X-16.524 Y2.368
G3 X-16.591 Y3.072 I-0.386 J0.318
G2 X-17.5 Y5. I1.591 J1.928
G1 Y15.
G2 X-15. Y17.5 I2.5 J0.
G1 X15.
G2 X17.5 Y15. I0. J-2.5
G1 Y-15.
G2 X15. Y-17.5 I-2.5 J0.
G1 X-15.
G2 X-17.5 Y-15. I0. J2.5
G1 Y-1.
G2 X-15. Y1.5 I2.5 J0.
G1 X-0.418
G3 Y2.5 I0. J0.5
G1 X-15.
G2 X-16.591 Y3.072 I0. J2.5
G3 X-17.295 Y3.005 I-0.318 J-0.386
G1 X-17.614 Y2.619
X-17.669 Y2.552 Z-19.992
X-17.722 Y2.487 Z-19.97
X-17.773 Y2.426 Z-19.933
X-17.818 Y2.371 Z-19.883
X-17.857 Y2.324 Z-19.821
X-17.889 Y2.285 Z-19.75
X-17.913 Y2.257 Z-19.671
X-17.927 Y2.239 Z-19.587
X-17.932 Y2.233 Z-19.5
G0 Z15.

M30

My M6 are looking like this:

M6END
EM The default script here moves the tool back to m6start if any movement has occured during the tool change..

x = GetToolChangeStart( 0 )
y = GetToolChangeStart( 1 )
z = GetToolChangeStart( 2 )
a = GetToolChangeStart( 3 )
b = GetToolChangeStart( 4 )
c = GetToolChangeStart( 5 )
if(IsSafeZ() = 1) Then
   SafeZ = GetSafeZ()
   if  SafeZ  > z then StraightTraverse x, y,SafeZ, a, b, c
      StraightFeed  x, y,  z  , a, b, c
else
Code"G00 X" & x & "Y" & y
end if






M6START
chengdu xhc technology ,all right reserved                      |
'please don't modify these code if you don't know what you doing |
'     
Declare Function ChangeTool Lib ".\Plugins\NcEther-8ts" () As Integer
dim newtool
Dim XWork, YWork,ZWork
dim chanok
Sub Main

newtool=GetSelectedTool()
OldTool = GetOEMDRO (824)
If newtool = OldTool Then
    Message"Tool No Change"
    If Not FileName() = "No File Loaded." Then
      ActivateSignal(Output6) 
    end if         
    Exit Sub
End If
DoSpinStop()    'stop spindle
SetUserDro(1384,newtool)
XWork = GetOEMDRO(800)  ' Get Current X Work Coordinate
YWork = GetOEMDRO(801)  ' Get Current Y Work Coordinate
ZWork = GetOEMDRO(802)
Call ChangeTool()
chanok=GetUserDro(1338)
If(chanok>2) Then
  SetCurrentTool(newtool)
end if
SetUserDro(1338,1) 
If Not FileName() = "No File Loaded." Then
      ActivateSignal(Output6)
      Sleep(100)
      DoSpinCW()
         'Code "G0 X" & XWork & " Y" & YWork
         'Sleep(500)        
         'While IsMoving()
         'sleep(50)
         'Wend
         Code"G0Z"& ZWork
      Sleep(500)
      While IsMoving()
         sleep(50)
         Wend      
         DoOEMButton(1000) ' Cycle Start   
end if               
End Sub
 

Title: Re: MACH 3 M6 modifies Z in the G54
Post by: Graham Waterworth on May 24, 2022, 07:15:19 AM

You need to change the H0 to H1 when using tool offset 1 and H3 when using tool and offset 3

your tool offsets need to be set too.

(2D CONTOUR2)
M5
T1 M6
S5000 M3
G54
G0 X-21.415 Y-1.669
G43 Z15. H0
Z5.

Title: Re: MACH 3 M6 modifies Z in the G54
Post by: Tomashi on May 24, 2022, 08:00:54 AM

Hi. Thanks for the reply. So I have corrected the G-code by using T1/H1 etc. I still have the issue that G54 in is changed when using M6.

Regarding the tool offset I have put in the Z Offset values for each tool. In the tool table I see these values in the column called Height (H). Is that what you mean ?

Regards Tomas

Title: Re: MACH 3 M6 modifies Z in the G54
Post by: Graham Waterworth on May 25, 2022, 06:49:31 PM

If you are working from the table top.

1. Go to mach3 offsets screen, select G54 top centre of screen, making sure end of spindle or what ever you use for the datum is correct value from Z home to table top.

2. Bottom right of offset screen set tool number to 1 and 'Gauge Block Height' to zero or if you are using a feeler gauge set to thickness of gauge.

3. Move tool and touch on table top or feeler.  Press 'Set Tool Offset' button.

4. Change to tool 3, set tool number to 3, touch on table top or feeler, press 'Set Tool Offset' button.

That should be all you need to do.