Z not Z

[Randy Morton @ Clem Industrial]

Hey,

 

Sorry for being a little off topic.

 

We have a Fanuc controlled horizontal. Pretty much normal run of the mill (pun intended) machine. Problem being that the absolute Z display does not show where Z is. If the program is at Z0. (facing for example) the machine reads ... well, some other number, usually in the 3.xxxx range. How can I make the machine abs. display read the actual position?

 

Thanks!

[chris m]

I think that the Absolute page shows what it shows; does your machine not have a Work page or something like that?

 

C

 

If not, G92 might work although it scares me

[CNCme]

Good Day,

 

There are Fanuc parameters for some display features, but I think some(older)controls only

read from home or Z zero return.

 

Also do you use work coordinate Z values other than zero.

 

--------?Which fanuc control is this?----------

 

Tony G

CNCme Engineering LLC

X Beta Site

Almost Employed Senior Programmer

N.E Massachusetts - Southern New Hampshire

_________________________________________

End mills and tooling are like The "AMMO"

And coolant and chips are like the enemy

Under your boots as you advance in the

Manufacturing Battle

-------------------------------------------------

[Randy Morton @ Clem Industrial]

It is a Fanuc 18-M control

[chris m]

Fanuc 18 should for sure have a Work or Operator page that shows the 'real' position; right?

[SledGeek]

18i-m has an abs, rel, and all button.

All will show you all positions including machine position and distance to go when running program.

This should tell you all you need to know.....unless i'm missing your point.

[Randy Morton @ Clem Industrial]

I won't be rude enough to say that you are missing my point, but that is not what I am getting at.

 

On all my other machines you have the ABS. (machine, relative & distance to go). ABS on all my other machines would show that my Z is at Z.25 if I am .25" away from the face. This machine does not. I hate distance to go. I have always gone on the ABS which is as I said in this paragraph.

 

So, I do have the ability to see how much more my tool will move, but that is not what is optimal, IMO. Having ABS read that you are at Z.25 when you are .25" away is optimal, again IMO.

 

So, for those of you running this control, how can I change it to read like this? I am running typically 8 - 12 differnt offsets per part due to the complexity of the piece, and would like to see where my tool is.

 

Paramater change maybe?

[crazy^millman]

I would say contact the machine builder or Fanuc and they should be able to point you in the right direction.

 

HTH

[CNCme]

Good Day,

 

 

There are many factors that control what ABS number tells you.

 

1.

Is the part Z zero the top of the part

2.

Also do you use work coordinate Z values other than zero.

3.

Are the tools touched on the part or a tool setter

inside the nachine.

4.

Are you using G43 G53 G52 or G91 to control

how Z is used in the body of the program.

 

Quote:

______________________________________________

I am running typically 8 - 12 differnt offsets per part due to the complexity of the piece,

_______________________________________________

 

In these 8-12 offsets, is the Z value for each offset on the top face of the part?

How do you control 8 -12 Z part Zeros for each tool.

 

 

If you use

G0 G90 G54 X Y

G43 H1 Z.25,

while touching tool off on top of part

enter the machine Z value in lenth offset #1.

 

Make sure the G54 Z value = zero

 

When the program says Z.25, the ABS will read Z.25 and the tool will be .25 from the top of the part.

It will not matter how many offsets

you use as long as the top face of the part is the part Z zero.

 

Tony G

CNCme Engineering LLC

X Beta Site

Almost Employed Senior Programmer

N.E Massachusetts - Southern New Hampshire

_________________________________________

End mills and tooling are like The "AMMO"

And coolant and chips are like the enemy

Under your boots as you advance in the

Manufacturing Battle

-------------------------------------------------

[Randy Morton @ Clem Industrial]

Quote:

 

1.

Is the part Z zero the top of the part

2.

Also do you use work coordinate Z values other than zero.

3.

Are the tools touched on the part or a tool setter

inside the nachine.

4.

Are you using G43 G53 G52 or G91 to control

how Z is used in the body of the program.

 

 

1. Yes the part zero (for said offset) is at the top (front, horiz. mill) of the part.

2. No

3. Tools are typically touched on the part

4. Using G43

 

As such, reguradless of using mulitple offsets, or just a single, should it not be that when you call G43 Hxx it will take up the TLC and cause your ABS to read where you are, not some out of whack number?

[Guest CNC Apps Guy 1]

I think it depends on how you take your offsets and where your offsets are relative to your origin. If you use "Gage Length" for tool lengths (length from tool tip to spindle gage line) and you part Z origin is from the top to the spindle face of the part then I would expect to see the numbers as you want to see them. Other than that,

[J Coulston]

This is how I read what you typed.

ABS REL

X1.1234 X6.7890

 

you want

ABS REL

X1.1234 X1.1234

 

The following works on a 16i.

 

POS - REL - OPTR - type axis leter(XYZB) - type axis(XYZB) value to match absolute - PRESET

 

I might have the sequence out of order but it is late and I not at the control. If it dosnt work I will go step by step on the control tomorrow.