Absolute position changing...

[Tancuda]

Hi all

I'm working on a vertical grinder with a 15T control.
I noticed that when I hit reset an no matter where is the X axis position,
the absolute position on the screen change to a number that is related to variable number 500 (used with G92 after the dressing cycle).

Is there a parameter that can be changed to avoid this
because I'm building a macro and if that position change all the time ,
it's big trouble.


Thanks a lot.

[ad64075]

When you run a program, the absolute position given is referenced to the wcs set in the program; g54, g55, etc, and remains modal. Once RESET is pressed, the program stops and all modal commands are cleared and the program is rewound to the beginning. The value you now see for axis position is machine position. There is a parameter that can be changed that will disable clearing of the modals, however this change will also not stop the spindle, will not stop the coolant, will not default the control to rapid traverse, among many other things.

Off topic but still related, why would you need to press reset during program execution? Furthermore, any good macro will work off of machine position NOT program position and will have safeguards built in to avoid damage to the part and machine in the event of program interruption. Meaning no disrespect, it sounds as though you may be in a little over your head with macro creation if you are overlooking such simple fundamentals.

[Tancuda]

Thanks for the reply, I understand your point, I'll go with an exemple:

It's a vertical grinder and the diamand (roller is to the left of the table. I use the original macro of the machine for dressing, the wheel will
position to the intersection of the roller, get dressed, come back to
intersection and then a G92 X#500 and Z#501 is programmed so the relative and absolute position is the same. Let's say X-15.000 and Z 10.00.

If a move manually the X axis to X-3.000 (exemple), the absolute and relative still have the same value (-3.000). So when I'm finished with editing, I hit reset, it's a reflex, just to be sure the cursor goes back to the beginning of the programand and ready to go.
By doing this, the X will change, but I would like it not to change,
I need the absolute position to work, not machine for what I have to do.


Sorry for my english

Thanks

[Dan Fritz]

Do you have a switch or button on your panel called "ABS", or "Manual Absolute?" It may also be a bit on one of the SETTING screens.

ABS is an input signal that determines whether the control stays in absolute (moving the absolute position registers) when you're in manual mode (Jog, for example). If ABS is turned off, then when you move the machine in jog, the absolute position is shifted by the amount you jog. If it's on, then the machine keeps its absolute position.

I would recommend keeping ABS turned on at all times. In fact, I would even hard-wire the switch. This signal causes a lot of crashes. It dates back to the times when an operator might want to shift the program zero (the G92 point) manually to make corrections. Rather than jogging in a coordinate system shift, it's much safer to edit your G92 block.

[Tancuda]

Thanks Dan, no button, no switch, as you said, propably a bit on one of the SETTING screens, but can't find that bit. Any web site that can show all the parameter for a 15T ?

Thanks guys

[Dan Fritz]

Sorry, but I didn't realize that this was a 15T. The lathe controls (T) usually don't have an ABS switch like the M models.

I don't have a 15T manual, but I seem to recall that there is a parameter that determines if RESET changes the position display. Maybe someone else on the forum has a 15T maintenance manual and can help.

You said that you're using G92 to set the position, which should set the absolute registers. A tool offset can be (optionally) cancelled with RESET, but I don't think that you're talking about a tool offset being cancelled here. On a T control, the tool offset is invoked with the tool change T-code, and it will show on the absolute display. When you hit RESET, if the offset is cancelled, you would see that shift. If you're jogging the machine BEFORE a tool offset is invoked, then you should see no shift when you press RESET.

[Tancuda]

Originally Posted by Dan fritz If you're jogging the machine BEFORE a tool offset is invoked, then you should see no shift when you press RESET.

That's what I want.

You're right Dan, it's not a tool offset being cancelled, and G92 is made in the macro that came with the machine, and we do not edit these macro for safety.

And if someone has some clue on the parameter to change, It would be appreciate.

Thanks

[Dan Fritz]

In another post way back in 2006, someone said that the Faunc 11T did have a "manual absolute" input in the "Settings/Op panel" menu. The 11T is very similar to the 15T. That's still my best hunch.

See:
Absolute position PROBLEM

[Tancuda]

Did saw this post yesterday, and also check in SETTING PAGE, but
nothing about absolute position.

Thanks

[stevo1]

Tancuda,
I have the 15series manual but I am having problems here at home trying to access my I-DOCS data on my new computer to try and see if there is a parameter setting for this. I will look tomorrow when I get to work and try and post what I find.

Stevo

[Tancuda]

So nice of you Stevo1

thanks

[stevo1]

Attached is the parameter I think that you may be looking for. I am not 100% though.

Parameter 2202.1 (DSE). I was also looking for parameters pertaining to the reset button and did not see anything that looked like it would change it except for maybe 2401.7 (NCM). This is more for clearing the modal information.

Hope this helps.

Stevo