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Offline kolias

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Offset Screen
« on: August 29, 2009, 12:00:36 AM »
The offsets screen (Alt5) is becoming very annoying to me

I jog my axes where I want to start my project, zero the DROs and then I see on the table display my project is offset from 0,0. Then I go to the offsets screen, zero the axes under current work offset and back to main screen, zero again the DROs and now the project is at 0,0. Sometimes I have to do this a few times.

I will assume that if I jog my axes lets say to the middle of the table and zero the DROs, my project will be shown on the table display as been at 0,0

Is there any way to turn the offsets OFF?

Am I doing something wrong?

My soft limits have been set properly in the Homing Limits config
Nicolas
Nicolas

Offline ger21

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Re: Offset Screen
« Reply #1 on: August 29, 2009, 06:31:46 AM »
You might want to watch the Homing, Limits and Offsets video.

http://www.machsupport.com/videos/

Mach is always in G54 work offset unless you choose a different one. The offsets are relative to machine coordinates, which are defined when you ref the machine.

If you zero the regular DRO's and your project os offset from 0,0, then I'm guessing that the g-code is offset from 0,0. Can you post it?

I just did a quick test. Gcode for a circle centered at 0,0. Jog away from it. When I zero X and Y, the crosshairs center over the circle, at 0,0

Wwat you may need to do is regen the toolpath, as when you switch screens and change offsets and zero axis, the tolpath display may not be correct when you change back to a previous screen.

But watch the video. as Art does a pretty good job of explaining things.
Gerry

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Offline kolias

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Re: Offset Screen
« Reply #2 on: August 29, 2009, 09:12:43 AM »
Thank you Gerry

I did watch the video and that is where I learned about homing the machine. I will do it again.

If the machine is always in G54 work what are some of the other options and how I can make the change?
And why the machine is always in G54 work?

It is possible that the gcode is offset because sometimes I have to change the offsets and sometimes not, like when I load a project it is at 0,0. But I doubt it since I made the drawings and I always do them on a template I made in acad. Also with LC I click on the reset origin button.

I think there is a certain sequence involved to zero the DROs. Yes I do regen the toolpath + other. What I will do next time I will write down my steps involved to zero the DROs in offset.

Here is one of the gcodes I used
Nicolas
Nicolas

Offline Hood

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Re: Offset Screen
« Reply #3 on: August 29, 2009, 11:15:32 AM »

If the machine is always in G54 work what are some of the other options and how I can make the change?
And why the machine is always in G54 work?

Itss not always in G54 but that is the default, you can get to a different offset by either typing it in MDI or it can be in your code. Two ways to do that (in code or MDI), The first six offsets can be got by G54, G55.... TO G59.  To call higher offsets you would call G59P* where * is the offset number. eg if it was G59P230 that would be offset 230 you were calling. G59P1 would be offset 1 or in other words G54 :)


I think there is a certain sequence involved to zero the DROs. Yes I do regen the toolpath + other. What I will do next time I will write down my steps involved to zero the DROs in offset.

Here is one of the gcodes I used
Nicolas


Just pressing the Zero at the side of the DROs will set the zero position for the offset you are presently in (look at the top and see what you are in) but if your code has for example G56 in it and you have set the zero whilst in G54 then it is likely that it will not be the same position (see your offset table) so it may show different to what you are thinking.

Hood
« Last Edit: August 29, 2009, 11:17:20 AM by Hood »

Offline kolias

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Re: Offset Screen
« Reply #4 on: August 29, 2009, 06:03:07 PM »
I just noticed the button in the offsets screen "Save Work Offsets". Pressing this button brings a table with many offsets. I choose the G54, zero all axes and clicked on save.

Then I loaded 3 projects and all now are at 0,0 including the offsets.

Is it advisable to do the above or it may get me into some kind of a trouble later on?
Nicolas
Nicolas

Offline ger21

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Re: Offset Screen
« Reply #5 on: August 29, 2009, 06:31:26 PM »
Any time you zero the axis', the saved G54 offsets will change (until you restart Mach3). It's kinda hard to tell you what you should be doing without knowing exactly how you are working.
Gerry

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Offline kolias

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Re: Offset Screen
« Reply #6 on: August 29, 2009, 07:54:46 PM »
You might want to watch the Homing, Limits and Offsets video.

http://www.machsupport.com/videos/
But watch the video. as Art does a pretty good job of explaining things.

I just did that twice and now I have no problems with offsets.

As you said Al does a pretty good job explaining how things works but on the other hand it's difficult for a beginner to grasp and retain all this.

Now with a bit of more time using my machine and the answers from you and Hood helped understanding the video much better.

Thank you
Nicolas
Nicolas