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Engraving problems
« on: April 01, 2020, 05:09:24 AM »
Good day

I have a problem when i engrave on my laser machine
When i engrave with a zigzag patron the design moves in one direction even tho the mach 3 software say it is in position
but if i engrave in a fill it engraves without moving the design
also if i do normal cutting of parts all comes out fine and straight
 
I made a couple of test and the results is always the same in the same direction and the same amount   
Attach some photo of the out come of my test
has any body came across a simile problem and do you have advice
machine as been doing it from the begging

I use aspire to do the designs and to write the gcodes

Thank you in advance

Offline Tweakie.CNC

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Re: Engraving problems
« Reply #1 on: April 01, 2020, 05:16:33 AM »
My guess is that you are loosing steps - try reducing Velocity and Acceleration in motor tuning and save the changes.
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Re: Engraving problems
« Reply #2 on: April 01, 2020, 06:08:26 AM »
I have try adjusting Velocity and Acceleration still same results
I have used the same drawing only change i have made it the way it does the engraving
Engraves by going around the design and not zigzag using exactly the same settings

So my question is where can the problem be
Because if i am loosing steps why is the one type engraving correct and the other one not correct

Offline Tweakie.CNC

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Re: Engraving problems
« Reply #3 on: April 01, 2020, 06:27:40 AM »
What are your Velocity and Acceleration settings for each axis ?
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Re: Engraving problems
« Reply #4 on: April 01, 2020, 07:43:45 AM »
              Acceleration           Velocity
X axis         175                     1300
y Axis         175                     1300

Offline Tweakie.CNC

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Re: Engraving problems
« Reply #5 on: April 01, 2020, 09:55:21 AM »
You settings seem quite modest so the only other thing that I can suggest is that you look for some sort of mechanical slippage on your X Axis drive chain.
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Re: Engraving problems
« Reply #6 on: April 02, 2020, 01:09:12 AM »
If you .zip and attach the zig-zag Gcode file that is causing you problems I will run it here to see if the problem persists. Also attach your <your profile>.xml file (Mach3 folder (typically Mach3Mill.xml)) then I can check your settings to see if anything there is causing an issue. You need to rename the .xml file to hardus.xml before it can be attached (all files / attachments posted to the forum need a unique name).

Tweakie.
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Re: Engraving problems
« Reply #7 on: April 02, 2020, 03:31:31 AM »
I have attached the files as per request
The quick engrave 1 file i use the y axis to do the zigzag and the test square 0 deg i use the x axis to do the engraving
I have the same issue with both files
some times i will have this issue with only one side of the square 
Also did another test with engraving a letter (B)
same velocity and acceleration settings but with different kurnel settings
the machine is using a parallel port
i did determent with DriverTest.exe witch is the best kurnel speed for the machine and it is 35khz
but i did also engrave with the machine using the impact/engrave plug in for mach3 and the pictures turned out with out any problem and i used a kurnel speed of 25khz

Please let me know if you require more information and thank you for the assistance so far     
Re: Engraving problems
« Reply #8 on: April 02, 2020, 03:38:31 AM »
Some more pics
Three of the sides are correct and only one is not correct
Big square was made with zigzag using y axis the small square was made using the x axis 

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Re: Engraving problems
« Reply #9 on: April 02, 2020, 06:03:35 AM »
Your Gcode files ran correctly here without any sloping of the sides.

Interesting that you have the feed-rate set at 12,000 mm/min which an axis would not achieve over such a short distance as the zig-zag path. When I set the correct laser power for maximum velocity on the long strokes over-burn was created on the zig-zag. This results in pretty poor engraving results as can be seen in my pic. and it is really not the correct way to laser engrave anything.

I think you need to create a better toolpath and run at a modest feed-rate and see what results you get then. Something else worth trying (and this may correct your sloping sides) is changing your Ports & Pins / Motor Outputs / Step Low Active to Active Low (tick) for the X, A and Y axis.

Tweakie.

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