Material positioning
02 Jul 2015 23:00 #60349
by Laci
Material positioning was created by Laci
Hello!
I just started to work with LinuxCNC, and I already have a problem.
Hope someone can help me out.
The problem:
I have a circular barrel head to carve.
In Aspire I gave as the XY datum position the midpoint of the workpiece.
Everything goes fine, saved the toolpath ( with LinuxCNC postprocesor ).
But when loading the G code into LinuxCNC the middle of the workpiece is allways the left bottom corner of the table ( outside the table ).
If I home and touch off the X,Y and Z axis in the middle of the workpiece when the spindle starts to work it doesn't start from the middle of the circle where the touch off was set, but starts to jog somewhere right upwards.
I have no idea what to do, tried everything, searched all forums, but no help.
Hope here I can get some advice what to do.
Sorry if I made spelling mistakes.
Thank you.
I just started to work with LinuxCNC, and I already have a problem.
Hope someone can help me out.
The problem:
I have a circular barrel head to carve.
In Aspire I gave as the XY datum position the midpoint of the workpiece.
Everything goes fine, saved the toolpath ( with LinuxCNC postprocesor ).
But when loading the G code into LinuxCNC the middle of the workpiece is allways the left bottom corner of the table ( outside the table ).
If I home and touch off the X,Y and Z axis in the middle of the workpiece when the spindle starts to work it doesn't start from the middle of the circle where the touch off was set, but starts to jog somewhere right upwards.
I have no idea what to do, tried everything, searched all forums, but no help.
Hope here I can get some advice what to do.
Sorry if I made spelling mistakes.
Thank you.
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03 Jul 2015 07:24 #60359
by cmorley
Replied by cmorley on topic Material positioning
maybe your tools have offsets assigned to them that are wrong?
Can you post the gcode?
Can you post the gcode?
The following user(s) said Thank You: Laci
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03 Jul 2015 11:11 #60363
by Laci
Replied by Laci on topic Material positioning
Dear cmorley, thank you for your response.
Please check the attached file.
If you need any other data or screenshots, please let me know.
Thank you.
Please check the attached file.
If you need any other data or screenshots, please let me know.
Thank you.
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03 Jul 2015 16:50 #60371
by andypugh
Are you "touching off" into the current coordinate system (probably G54) or into the tool table?
First check that your tool table has no offsets in X or Y
Then make sure that you touch-off the coordinate system. You should see the preview move to the middle of the red machine range box.
Then jog the tool to the start position, and check that the DRO (in relative mode) shows the expected numbers.
Replied by andypugh on topic Material positioning
But when loading the G code into LinuxCNC the middle of the workpiece is allways the left bottom corner of the table ( outside the table ).
If I home and touch off the X,Y and Z axis in the middle of the workpiece when the spindle starts to work it doesn't start from the middle of the circle where the touch off was set, but starts to jog somewhere right upwards.
Are you "touching off" into the current coordinate system (probably G54) or into the tool table?
First check that your tool table has no offsets in X or Y
Then make sure that you touch-off the coordinate system. You should see the preview move to the middle of the red machine range box.
Then jog the tool to the start position, and check that the DRO (in relative mode) shows the expected numbers.
The following user(s) said Thank You: Laci
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03 Jul 2015 17:28 #60372
by Laci
Replied by Laci on topic Material positioning
Thank you Andy.
I will try as you suggested.
The coordinate system is the current G54 as you wrote.
The tool table has no offset as I remember, but I have to check it out.
Hope it will work.
Thank you again.
I will try as you suggested.
The coordinate system is the current G54 as you wrote.
The tool table has no offset as I remember, but I have to check it out.
Hope it will work.
Thank you again.
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03 Jul 2015 22:28 #60382
by Laci
Replied by Laci on topic Material positioning
Unfortunately I didn't succeed.
Here are the steps with print screens:
In Aspire:
1. Set up job in Aspire - Asp. job setup.jpg
2. Tool data - Asp. tool database.jpg
3. Asp. toolpath save.jpg
In LinuxCNC:
1. Loading the G code
2. Tool database
3. Top view
4. Homing and touch off
5. Homing and touch off done
Second part coming. Could not load more files.
Here are the steps with print screens:
In Aspire:
1. Set up job in Aspire - Asp. job setup.jpg
2. Tool data - Asp. tool database.jpg
3. Asp. toolpath save.jpg
In LinuxCNC:
1. Loading the G code
2. Tool database
3. Top view
4. Homing and touch off
5. Homing and touch off done
Second part coming. Could not load more files.
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03 Jul 2015 22:35 #60383
by Laci
Replied by Laci on topic Material positioning
Second part:
6. Touched off in the middle of the barrelhead. ( Touch off JPG ). But when started to carve, the spindle first went to the bottom left corner, then back to the middle of barrelhead.
It should start right at the touch off points, right?
7. Also I made a picture about the DRO.
I don't know what it would be the right setting, or what am I do wrong.
I quess it might be the Position: relative actual. Don't know.
If you could help me it would be great.
Thank you in advance.
6. Touched off in the middle of the barrelhead. ( Touch off JPG ). But when started to carve, the spindle first went to the bottom left corner, then back to the middle of barrelhead.
It should start right at the touch off points, right?
7. Also I made a picture about the DRO.
I don't know what it would be the right setting, or what am I do wrong.
I quess it might be the Position: relative actual. Don't know.
If you could help me it would be great.
Thank you in advance.
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04 Jul 2015 00:14 #60389
by andypugh
Not necessarily. Touch-off sets the 0,0 position. Your G-code starts with a move to X -6, Y0.4
I think that the problem is the G28. That is a "return to home" and if you don't have a G28 position set then perhaps it is just going to machine origin. I think you probably want to remove that whole first line.
Replied by andypugh on topic Material positioning
6. Touched off in the middle of the barrelhead. ( Touch off JPG ). But when started to carve, the spindle first went to the bottom left corner, then back to the middle of barrelhead.
It should start right at the touch off points, right?.
Not necessarily. Touch-off sets the 0,0 position. Your G-code starts with a move to X -6, Y0.4
G21 G91 G28 X0 Y0 Z0
G40 G17 G80 G49
G90 G54
G43.1 Z3.0000
G0 X0.0000 Y0.0000
M6 T1
S12000 M3
G0 X-6.7734 Y0.4750Z3.0000I think that the problem is the G28. That is a "return to home" and if you don't have a G28 position set then perhaps it is just going to machine origin. I think you probably want to remove that whole first line.
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