X axis G28 point is moving .75 after each program has completed
Our machine has started to offset .75 the x axis every time a program finishes. Parts are to size and nothing weird going on during program. It seems to move just the x over to the right by .75 inches everytime a program finishes. Is there a macro or gcode that could have been activated unknowingly that could be causing just the x to move .75 every time to the right after a program completes?
Here is what we have tested and know to be true:
There are no changes from post processor output of same file from last month and today.
Ref All home and G28 as many times as you want and it will be exactly in the same spot.
Move all axis around machine then g28 and it will be in the exact same spot
Calibration for steps per inch have been redone and checked. It will move exactly how much you tell it to in the calibration set up.
If you run a program and run the same program again it will be offset .75 every program run that is processed. Only way to reset is to ref all home g28 then zero axis out.
Parts are to size and no oblong circles.
Y axis is not included in the offset movement.
New drives and encoders were installed without a difference.
Different gearhead was installed with the same outcome.
Rack and pinion have no issues.
1 Attachment(s)
Re: X axis G28 point is moving .75 after each program has completed
davy182
Check your settings, Go to Config Motor Home/Softlimits & see what you have set in the G28 Box, apart for this post the end part of your program this may not be correct also
Re: X axis G28 point is moving .75 after each program has completed
that part of the setting is correct and hasn't changed.
1 Attachment(s)
Re: X axis G28 point is moving .75 after each program has completed
here are the gcodes that are active
g15 g80 g17 g40 g20 g90 g94 g54 g49 g99 g64 g97
here is a better view of what it is doing
Re: X axis G28 point is moving .75 after each program has completed
Quote:
Originally Posted by
davy182
here are the gcodes that are active
g15 g80 g17 g40 g20 g90 g94 g54 g49 g99 g64 g97
here is a better view of what it is doing
That does not tell us anything at all, post the program, Just cut & paste it, on the Config in the above photo, is the G28 boxes blank or do you have numbers in it,
Re: X axis G28 point is moving .75 after each program has completed
( pen )
( File created: Monday, October 13, 2014 - 02:15 PM)
( for Mach2/3 from Vectric )
( Material Size)
( X= 48.000, Y= 96.000, Z= 0.250)
()
(Toolpaths used in this file:)
(pen1)
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(6 = Pen Tracing {0.05 inches})
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1 Attachment(s)
Re: X axis G28 point is moving .75 after each program has completed
here is the screen shot. A new computer was tried with fresh install of mach3 and nothing different.
Re: X axis G28 point is moving .75 after each program has completed
Quote:
Originally Posted by
davy182
here is the screen shot. A new computer was tried with fresh install of mach3 and nothing different.
Your program is in incremental G91.1, you want to do you program using absolute G90, you also don't need a G94 & the G70 in the program
You also don't have a G54 for your work offset, so the control does not know were to return to work Zero
By using the G28 to reset your machine it will move to what your settings are, from machine Home & the numbers you have set in the G28 settings
Re: X axis G28 point is moving .75 after each program has completed
Re: X axis G28 point is moving .75 after each program has completed
I would at least try mactech54 recommendation, sometime the cad system you my be using does not include these codes in the parameters, but can be alterd, just take a better look at the manuals.
Re: X axis G28 point is moving .75 after each program has completed
Quote:
Originally Posted by
mactec54
Your program is in incremental G91.1, you want to do you program using absolute G90,
No, it's not.
N100G00G20G17G90G40G49G80 < This puts the machine in Absolute mode
N110G70G91.1 < This puts the machine in Incremental IJ mode
The program is in G90, and stays in G90 throughout.
We've had this discussion before. This is standard practice for Mach3, and is correct.
I don't see anything in the code to cause it to do what you're saying. It could be something in your M6 macro, or I'd guess it's mechanical and it's loosing steps somewhere.
At the end of the program, does the pen finish at the corner where it started?
If you set X and Y to zero before it starts, does it start there, or move .75 before it starts drawing?
Re: X axis G28 point is moving .75 after each program has completed
Quote:
Originally Posted by
ger21
No, it's not.
N100G00G20G17G90G40G49G80 < This puts the machine in Absolute mode
N110G70G91.1 < This puts the machine in Incremental IJ mode
The program is in G90, and stays in G90 throughout.
We've had this discussion before. This is standard practice for Mach3, and is correct.
I don't see anything in the code to cause it to do what you're saying. It could be something in your M6 macro, or I'd guess it's mechanical and it's loosing steps somewhere.
At the end of the program, does the pen finish at the corner where it started?
If you set X and Y to zero before it starts, does it start there, or move .75 before it starts drawing?
Nobody said there was anything in the code that would cause it to do what it was doing, his Program is in Incremental If you have a G91.1 after a G90 then your Program will be executed in Incremental
It was what he did to move his machine that made it move to where it was, He used a G28 to move the machine after the program had finished & this would move his machine to were ever he has the setting set in relation to the Machine Zero or work Zero, depending how he had his work set up
The top line of code is a safety line which cancels or activates those codes, In this case there is a G90 ( absolute ) which is only active until is see's the G91.1 ( Incremental )
N100G00G20G17G90G40G49G80
N110G70G91.1
N120T6M06
There is nowhere else in the Program that there is a G90 after this G91.1,so his Program would be run in Incremental
Re: X axis G28 point is moving .75 after each program has completed
Quote:
Nobody said there was anything in the code that would cause it to do what it was doing, his Program is in Incremental If you have a G91.1 after a G90 then your Program will be executed in Incremental
No, it won't. You're 100% wrong.
If you'd run the program in Mach3, you'd see that it stays in G90 (Absolute) through the entire program. It never changes to incremental, because G91.1 IS NOT INCREMENTAL!!
Stop trying to tell people it is, when it's not.
1 Attachment(s)
Re: X axis G28 point is moving .75 after each program has completed
Quote:
Originally Posted by
ger21
No, it won't. You're 100% wrong.
If you'd run the program in Mach3, you'd see that it stays in G90 (Absolute) through the entire program. It never changes to incremental, because G91.1 IS NOT INCREMENTAL!!
Stop trying to tell people it is, when it's not.
So the Mach3 instruction manual is wrong then
G90 & G91 are a Preparatory Function Plus they are Modal
Re: X axis G28 point is moving .75 after each program has completed
No, G91.1 is incremental IJ mode, and has nothing to do with G90, which puts Mach3 in absolute DISTANCE mode.
His code runs in absolute distance mode throughout (G90).
1 Attachment(s)
Re: X axis G28 point is moving .75 after each program has completed
Quote:
Originally Posted by
ger21
No, G91.1 is incremental IJ mode, and has nothing to do with G90, which puts Mach3 in absolute DISTANCE mode.
His code runs in absolute distance mode throughout (G90).
You are saying the G91.1 serves no purpose,other than to do the I & J in incremental,
So if you have your control Configured correctly, to normal industry standard, as it should be, the G91.1 would be redundant, as it serves no purpose, Most controls Default to Incremental for I & J just the same as you can configure it in Mach3
Re: X axis G28 point is moving .75 after each program has completed
What I'm saying is that you're giving out incorrect information:
Quote:
Your program is in incremental G91.1, you want to do you program using absolute G90,
You're now trying to change the subject.
Vectric adds a G91.1 to their code so they don't get hundreds of support calls because their IJ mode is set wrong. I guess they should send them to you so you can tell them their machine is configured incorrectly, which has nothing to do with the OP's problem.
Conversation over.
Re: X axis G28 point is moving .75 after each program has completed
ok here is the rundown and would be a good idea to write down in the books for a problem check, as it is out of my realm of expertise to explain:
The x motor had a frayed/most strands broken on the ground for the motor. It was on the cnc side of the wiring and not the motor side of the connector, hence when a different motor with gear-head was swapped it had the same issue. Once the ground was repaired poof problem solved. If anyone can explain how the motor only moved right and exactly .75 inches because of the ground issue I would like to know.
