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Author Topic: X0Y0 Jumping?  (Read 6604 times)

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Offline cuecaps

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X0Y0 Jumping?
« on: February 15, 2010, 10:45:49 PM »
Howzit Guys...
Please help... ???
I'm engraving with  Mach3 Mill and my fonts seem move or lose the X0Y0 position.
There is no z axis feed in the g code, meaning always G1 Z0.000 and I manually feed down .002" and repeat thesame simple font G-code cycle again.
The first few times is O.K., but, soon after, it engraves the fonts as if from another reference point.
I engraved others and never had this problem before.
The piece is secure..
Thanks for viewing..
(Click on the image for enlargement)
 Alton - Cue Caps
Re: X0Y0 Jumping?
« Reply #1 on: February 15, 2010, 11:20:20 PM »
I'd first check the machine mechanically.
    X or Y axis slides and screws have not gotten tight, dry, dirty, sticking or dragging.
    Couplings, shafts and pulleys are all tight and secure with no slippage.
Do multiple rapid moves to a dial indicator or accurate reference point to check closely for any missed steps.
As machines get used, their characteristics can change due to the above factors and sometimes require a clean-up/lube job or a re-tune of the motors.
If missed steps are suspected, reduce the max speed and acceleration by 50% and try it to verify, then tune up for best results.
If it worked well before, and you changed nothing, my guess would be mechanical.
Good luck,
Russ

Offline RICH

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Re: X0Y0 Jumping?
« Reply #2 on: February 15, 2010, 11:55:30 PM »
All looks good until you get to the letter  O and then that throws things off.
Do you have any problems when you try to do the  O by its self? I am wondering if its a rapid move and you  are skipping.


RICH
« Last Edit: February 15, 2010, 11:57:49 PM by RICH »

Offline cuecaps

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Replies
« Reply #3 on: February 16, 2010, 12:05:33 AM »
Thanks Russ and Rich!!
Appreciate your fast replies to help me..
I will do both your suggestions.
 I did recently have to re-configure my Mach 3 to Gecko 540 and the Motor tuning was haed to set,
being that I don't know what is ideal..
I will also do the check on the font letter "O".. as a control to be sure it's not isolated to that particular font.
 I will post tomorrow after I do what you guys told me.
Thanks, good night.
Alton

Offline RICH

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Re: X0Y0 Jumping?
« Reply #4 on: February 16, 2010, 10:05:10 AM »
Alton,
Get the code just for the letter O, but include any G0 or G01 before it.
You may want to try exact stop and constant velocity modes.
Like Russ, said reduce 50% as that should allow you headroom, but start there after
the retuning and work you way up still leaving a safety margin of say 30%.
May run slower, but at least you avoid possible problems. If you are using backlash compensation
reduce that also. Do as you wish since, i work on the conservative side on speed for the sake of movement reliability.

BTW, went to your site some very nice work there.
RICH

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Motor tuning
« Reply #5 on: February 16, 2010, 09:36:50 PM »
Hi,
 I did the travel test and seems to be O.K.
I re did the top and it moved .005" on the 5th time I ran the program.
I stopped it and did the upper fonts.
I'm getting a hard time taking a photo to show the defects, 'cause that abalone material
gives off reflective lighting making photo taking frustrating.

The Fonts are in a .750" disc.. Following the curve.
On the 2nd cut, the fonts cut it to a smaller radius.

The Motor tuning is at 10.42 Velocity and 3.75 Acc.  for X & Y Axis.
 The fonts are about 1/8 " tall. Diameter of round piece is .750" or 3/4"
The cutter size is .0079" Depth of cut is .002"
Spindle speed is approx. 18,000 and feed rate I'm using is .8 units/min.
Could there be a "Virus" in the program that Norton Security Scans can't detect?
Or something wrong with my computer's micro chip?
Thanks for your comps on my site Rich...
 Alton

« Last Edit: February 16, 2010, 09:40:06 PM by cuecaps »
Re: X0Y0 Jumping?
« Reply #6 on: February 17, 2010, 02:48:47 AM »

Could there be a "Virus" in the program that Norton Security Scans can't detect?
Or something wrong with my computer's micro chip?
Thanks for your comps on my site Rich...
 Alton

The PC running Mach should only be running Mach not anti virus software

Phil
The Good Thing About Mach3, Is It's very Configurable

The Bad Thing About Mach3, Is It's Too Configurable

Offline RICH

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Re: X0Y0 Jumping?
« Reply #7 on: February 17, 2010, 09:48:45 AM »
Quote
I re did the top and it moved .005" on the 5th time I ran the program.
I stopped it and did the upper fonts.

Can't really tell from the picture  because of the reflections and how the pic was taken ( not perpendicaular to the piece).
Looks like the center is different due to machine moves. I am thinking it is  a mechanical problem.
I would, for example,  do four  circles of say .020" diameter / four equaly spaced about the center. If your machine along with setup etc. is
 really good you can engrave those four circles say 5 times and see how well they all engrave. You can measure any
differences.Not bragging, but i probably couldn't see much differences under a microscope with mine other than spindle run out.

link to example pic below:
http://www.machsupport.com/forum/index.php/topic,13762.msg90926.html#msg90926

I don't think it is a Mach problem.

RICH

Post your code if you wish and "maybe" i will run it.

« Last Edit: February 17, 2010, 09:55:38 AM by RICH »

Offline cuecaps

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Remove Anti-Virus?
« Reply #8 on: February 17, 2010, 12:34:10 PM »
Thanks Phil,
 Should I remove the AVA Anti-Virus program from my computer?
I use another computer strickly for the CNC/Mach 3. No internet connected to it.
So, I don't need any virus protection since I'm not connected?
I am wiling to do this.
Now, I'm on a new HP  desktop for e-mails and other media, and my turbo-CAD.

Below is a photo of the tool Path.
And, the other shows how the top fonts curve is smaller than the required radius.
Rich,
What is that "exact stop and constant velocity modes" ?

Yes, I will be running in circles today... ;D
..test it as suggested..
Thanks,
Alton
« Last Edit: February 17, 2010, 12:36:16 PM by cuecaps »

Offline RICH

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Re: X0Y0 Jumping?
« Reply #9 on: February 17, 2010, 04:06:55 PM »
Explaination of exact stop vrs constant velocity, here is the link:

ftp://ftp.machsupport.com/Docs/Mach3_CVSettings_v2.pdf

RICH