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Author Topic: How to reload last "Machine coordinate" when start up ?  (Read 4034 times)

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How to reload last "Machine coordinate" when start up ?
« on: November 24, 2009, 11:52:02 PM »
Dear all,
I'm investigating mach3
I have a question about Machine coordinates work coodinates

When start mach3, Machine coordinates is automatic set to zero , after that I need REF ALL HOME to find Home position again !
After Run some G code file, I turn off Mach3, at that times it ask me "SAVE FIXTURES?", I answer YES.

When Start up Mach 3 again Machine Coordinates is become ZERO.

--> My question : how can I set to Mach3 to make it start up with the last Machines coordinates instate of  Zero .
Sorry about my English.
 
Re: How to reload last "Machine coordinate" when start up ?
« Reply #1 on: November 25, 2009, 12:19:50 AM »
Check these items on your CONFIG page.

Offline budman68

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Re: How to reload last "Machine coordinate" when start up ?
« Reply #2 on: November 25, 2009, 02:56:28 PM »
Quick question about this, if I may?

When you go to start up the PC, the stepper motors jump around a bit before Mach 3 actually loads in Windows, so the actual dimensions on the DROs on the screen are not the actual coordinates on the machine, correct?

Thanks,
Dave
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Re: How to reload last "Machine coordinate" when start up ?
« Reply #3 on: November 25, 2009, 03:03:57 PM »
I think that is absolutely correct Dave.
There were earlier discussions about leaving the power to the motors OFF until the booting was done to  eliminate the jitter but I allways get a little click anyway.
I ALWAYS run the homing routine at start-up.
But if one has no switches, and is homing to a reference mark, all would be close enough.....I'd think.
jmo
RC

Offline budman68

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Re: How to reload last "Machine coordinate" when start up ?
« Reply #4 on: November 25, 2009, 03:16:39 PM »
Agreed, and thanks for confirming that for me  ;)

Dave
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Dave->    ;)
Re: How to reload last "Machine coordinate" when start up ?
« Reply #5 on: November 25, 2009, 04:15:02 PM »
Dave,
  I recall when I set up my first lathe, with relatively cheap switches, I would uncheck Auto Zero on the homing page just to check the consistency/precision of the switches while running several homing routines. They were within .0002" which was great for me.
  Then I did the same thing while booting up several times to see how much I moved during the port jitter. It was rarely over .001"
I guess some ports make more racket than others too.
I still home every time though, just seems to be the right thing to do and a practical standard.
My stuff isn't that critical...I'm just tinkering.
One of these days, I hope to have a commercially made machine that can utilize the precision Mach has to offer.
Happy Turkey Day,
Russ
Re: How to reload last "Machine coordinate" when start up ?
« Reply #6 on: November 26, 2009, 04:26:09 AM »
Check these items on your CONFIG page.

Dear all,
Mr Overloaded is answered me, that is what I need. Thank all again.


Offline stirling

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Re: How to reload last "Machine coordinate" when start up ?
« Reply #7 on: December 02, 2009, 06:24:50 AM »
Not sure what the situation is with servos but I'm pretty sure I'm right in saying that if you're microstepping steppers this will NOT yield the EXACT results you might expect. Microstepping drives have no memory accross power cycles of which microstep they were on in their sequence and will allways start their cycle "assuming" that the motors are starting at a full step position. This means that the first few microsteps after power on can be unreliable in terms of motor position.