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Help with Homeing ?
« on: July 15, 2018, 05:26:57 PM »
Hello Everyone

My machine is now working pretty good, I am trying to have the axes move away from the switch more then it already dos
My Homing work good, but the spindle ends up off the table,
Is it possible to have it more a few inches after hinting the switch ??
I read the book and tried a few things with no success

Thanks 
Re: Help with Homeing ?
« Reply #1 on: July 15, 2018, 09:19:44 PM »
Hi,
if you are using a parallel port I don't think you can do it.

There is a difference between 'home offset' which is a Mach feature and enacted by the parallel port
and 'remote homing' which is not a Mach feature. There are some motion controller that can do it, the ESS
and the PoKeys 57CNC and maybe others too.

With a parallel port if you set a HOME OFFSET in the homing/limits page the axis will back off the switch, only
as far as it has to for the switch to change state, and then ZERO the machine coords for that axis if you have
not set a home offset, OR, set the machine coords for that axis to the OFFSET you supplied. IT DOES NOT TRAVEL
THE DISTANCE,  IT JUST SETS THE MACHINE COORD TO THE OFFSET.

If you have a motion controller that allows it you can program a distance and the axis will back off that distance.
As I say I know the ESS and the 57CNC have it...don't know about the others.

You can get a similar thing to happen with a parallel port by specifiying offsets and THEN when hominig is complete
issue an MDI G28.

Craig
My wife left with my best friend...
     and I miss him!

Offline ger21

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Re: Help with Homeing ?
« Reply #2 on: July 15, 2018, 09:53:44 PM »
You can do something like this with the home macro:

DoButton( 24 ) ' Home Z
Code "G53 G0 Z-1"
While IsMoving()
Wend
DoButton( 23 ) ' Home Y
Code "G53 G0 Y1"
While IsMoving()
Wend
DoButton(22) ' Home Z
Code "G53 G0 X1"
While IsMoving()
Wend
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html
Re: Help with Homeing ?
« Reply #3 on: July 15, 2018, 10:56:31 PM »
Thanks Guys

After not getting anywhere I was trying to change the button macro, but when it comes to that i don't know what i am doing hehe
I will try that macro in the morning thanks
So Mach 3 cant really do what i want it to do ?? I am using parallel ports  
I have discovered a few more problems, i am starting to think i am wasting my time with mach 3 and should move to mach 4

Thanks again

 
Re: Help with Homeing ?
« Reply #4 on: July 15, 2018, 11:36:46 PM »
Hi,

Quote
So Mach 3 cant really do what i want it to do ?? I am using parallel ports
That is not correct, if you add the code Gerry recommended it would work fine. If you were
to buy a motion controller that supports 'remote homing' would another alternative.

Quote
i am starting to think i am wasting my time with mach 3 and should move to mach 4
Mach4 does not do 'remote homing' natively either. The programming and customisation abilites
of Mach4 make it very easy to do however, and conceptually identical to Gerry's suggestion.
Alternately you would have to buy motion controller that supports 'remote homing' directly.

Neither Mach3 or Mach4 are magic, you can't just dream up an idea and expect that either the software
or the hardware support it.

Craig
My wife left with my best friend...
     and I miss him!
Re: Help with Homeing ?
« Reply #5 on: July 15, 2018, 11:44:50 PM »
I understand, i think i will get a ESS for fun to play with and a copy of mach 4
I been having a hard time with this machine, it works well and all of a sudden it don't.
Tonight it started again
I move X and Y at the same time and when Y changes directions X makes a cluck and or knock and i am sure it misses a few beets, you can see it when looking at the spindle
And it seams like Mach 4 don't do it, but hard to tell, i cant get the keyboard to work hehe ( I will Print off the Manual )
I got them Chinese Stepper drives with the elephant on it, i think them will get changed for Geckos   

Thanks

« Last Edit: July 15, 2018, 11:52:02 PM by biggermens »
Re: Help with Homeing ?
« Reply #6 on: July 16, 2018, 12:20:15 AM »
Hi,
I switched to Mach4 a couple of years ago with an ESS as motion controller. I personally believe the combination
is very much more stable and predictable by comparison to Mach3 and two parallel ports, not that I too
many problems with them either, but still Mach4/ESS is better.

Craig
My wife left with my best friend...
     and I miss him!
Re: Help with Homeing ?
« Reply #7 on: July 16, 2018, 12:54:12 AM »
This is my forth machine and first with Chinese motor and drives etc.. and this is the one that give me the most headache.
and now that stupid knock i cant figure out,
Did you here anything about them elephant stepper drives ??

THanks
Re: Help with Homeing ?
« Reply #8 on: July 16, 2018, 12:57:41 AM »
Hi,
no I haven't.

Leadshine AM882's enjoy a good reputation for around $80.

Craig
My wife left with my best friend...
     and I miss him!
Re: Help with Homeing ?
« Reply #9 on: July 16, 2018, 01:05:59 AM »
I always used geckos in the pass and never had a problem,
them Leadshine AM882's for 80$ if they work well that is pretty good deal :)

this is the ones i got now
https://img.diytrade.com/cdimg/1916702/26152443/0/1338977780/Cnc_4_2A_Bipolar_2ph_digital_Micro_stepper_motor_driver.jpg


Thanks