RE: Set Coordinates Tcl

[Ethan Vos <ethan-at-forward.ca>]

OK, now I'm really confused.

If I write "1.0" into the 5221 parameter, which I guess is the default X 
axis adjustment, the X axis changes by .0394, so it's displaying metric.

How can that happen if I've set up everything to inches?

I have set the .ini to inches and am using G20 in the program. I think that 
G20 also is in the .ini file for startup. The Tkemc has the word "inches" 
in the top right hand corner.

Where does the metric conversion happen?

Ethan


-----Original Message-----
From:	Ray [SMTP:rehenry-at-up.net]
Sent:	Friday, August 31, 2001 11:52 AM
To:	Multiple recipients of list
Subject:	Re: Set Coordinates Tcl


On Fri, 31 Aug 2001, you wrote:
> I'm really starting to have fun with this.

Good.

> Questions about the Set Coordinates Tcl in the 801bin.
>
> 1. What do I need to change to get the cursor to the end of the zeros
> (0.0000) rather than at the beginning?

In Tk, focus is what is being shifted around when you move from widget to
widget.  Focus aims at the whole widget.  I don't know if there is a way to
point focus at the least significant digit and then get the program to
treat each successive character as a times tens shift.  I am aware that 
many
of the commercial CNC guis do enter digits starting from the right.  It is
nice when you want to add a tenth or two to a number.

> 2. What other parameters can I use (it starts with 5221) and where in the 
> tcl do I make the change? I tried changing the 5221 at the end of the
> program to 1000, but the tcl wouldn't work. I need to make a Tcl to input 
> data into the variable table.

You can use any number up to 5400. (or is it 5399)  See these

www.linuxcnc.org/handbook/RS274NGC_3/RS274NGC_33a.html#1008244
www.linuxcnc.org/handbook/gcode/variables.html

They will also be under the handbook icon on your BDI disk in a similar
location.

> 3. I have changed the setaxis to "2" instead of to read from the .ini 
file.
> I labeled them "Shim Adjust" and Excessive Wear" which I need to 
correspond
> to axis X and A. X is working OK, but I the 2nd axis (A) is updating the 
Y
> field. What do I need to do to change that?

The way that axis comp was expected to work was that you would place a
reference in each axis that you wanted a comp file for in the ini.

-----release notes snippet-----
You specify these files in the .ini file for each axis with the
[AXIS_#] COMP_FILE = <filename>, e.g.,

[AXIS_0]
..
COMP_FILE = x.cmp

This entry is optional. If it's not there, no compensation is done.
-----end of snippet-----

What I would do if I wanted to use a file named Shim_adjust.cmp for x is
add the following line to [AXIS_0] in the ini that I intend to run.

COMP_FILE = Shim_Adjust.cmp

Then for the A axis I would add the line

COMP_FILE = Excessive_Wear.cmp

to whichever axis number you use for your A definition.

Yes, you can change the references to compensation files in other places
and they will work but what you wind up doing is creating a non standard
system that you will have to edit every time you upgrade to a new release
of the EMC.  You also create a system that only you can support.

> 4. Where does the data come from that the Tkemc reads when it displays 
the
> axis offsets? I can't figure out why when I enter in 1.0 on the
> Set_Coordinates the display changes by .0394. I'm using G20 (I think) and 
> the .ini file has been changed from "auto" to "inches"

See the handbook references to parameters listed above.

HTH

Ray