Re: [CAD_CAM_EDM_DRO] Re: CNC Painting

At 12:31 PM 11/21/02 -0600, you wrote:

>I am very sure that Indexer, the tsr portion, always did allow for a
>Stop or Tooling Change with a return to last location or even a previous
>line of code as long as the "front end" handled the information
>correctly.

Exaxctly: the front end has to do it all!! I-LPT accepts commands written
to it in its format. That is the only way you can address it. You can't
tell it to 'stop', 'jog aside' and 'go back' w/o writing every single move
to it one line at a time. While it's executing a command, your computer is
locked up, and when it's not executing a command you must send it another
to make it move again. It's one or the other.

In order to make the emergency tool change work, I have to remember each
set coords into an array along with file pointer value that went with the
associated move, call jogging routine (which allows writing jog commands to
I-LPT) and move machine approporiately, remediate the problem, touch off
tool and save any changes in offset, and then exit the jog routine. CPU
then compares the present location with the last one in sequence, computes
moves to go back, sends them off one at time and starts executing program
again. If tool has been given new offset, that is book-keeped into this
move. If retrace number is given by operator, the program file is rewound
to the right pointer value for the number of lines to retrace and present
position is compared with the saved coords for the desired retrace point;
CPU then composes moves to that point and goes there, and then continues
file from the right pointer value. I assure you, 100% of that is embedded
in AW and not in I-LPT.]

> It's documented pretty well in some of the older manuals,

You'll have to show me. It's nowhere in mine nor any hint of it.

Regards, Hoyt McKagen

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