Simple G-code question

I am trying to adjust my post processor to have the machine go to the back left corner after the job is done using:

M5
G53 Z0
G0 X0 Y120

When this executes, after the Z moves to the top, as the machine is moving across to the XY position, the Z starts moving down. I can specify a Z like G0 X0 Y120 Z6, but I prefer not to guess what a good Z is here and just have the Z stay at Machine 0.

Shawn

G53 is only effective on the line it is stated
So..
G53 Z0
G53 X0 Y120.

That makes no sense. After the Z move is complete, it should just stay there until commanded to move again.

M5
G53 Z0

G0 X0 Y120 What happens if you run the code without this line? I understand the X and Y would not move, but what is the Z doing? Is the Z drifting down from vibration, or is it really being commanded to move? Try jogging X and Y to position after the G53 Z0 move and see what happens.

Try running this code and see what happens
M5
G53 Z0
G54
G0 X0 Y120

or this code
M5
G53 Z0
G53 X0 Y120

Quote:

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Originally Posted by szavoda

I am trying to adjust my post processor to have the machine go to the back left corner after the job is done using:

M5
G53 Z0
G0 X0 Y120

When this executes, after the Z moves to the top, as the machine is moving across to the XY position, the Z starts moving down. I can specify a Z like G0 X0 Y120 Z6, but I prefer not to guess what a good Z is here and just have the Z stay at Machine 0.

Shawn

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What Control / software are you using

Quote:

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Originally Posted by Jim Dawson

That makes no sense. After the Z move is complete, it should just stay there until commanded to move again.

M5
G53 Z0

G0 X0 Y120 What happens if you run the code without this line? I understand the X and Y would not move, but what is the Z doing? Is the Z drifting down from vibration, or is it really being commanded to move? Try jogging X and Y to position after the G53 Z0 move and see what happens.

Try running this code and see what happens
M5
G53 Z0
G54
G0 X0 Y120

or this code
M5
G53 Z0
G53 X0 Y120

---

I am sure it is not drift - it went down about 7 inches across the span from 0,40 to 0, 120. I will experiment with all of the recommendations and get back with results.

Regarding the software, this is Compass on a Yaskawa system.

G53 is cancelation of all work offsetts and takes comands direct from machine position
Were is your actual x and Y and z zero position when machine is homed ?

Home would be the front-left corner at top of the Z Axis

Were is Z -zero ?---high above the table or at the table ?

Z-Zero is high above the table...

Try
(Safe home)
G00 G91 G28 Z0.0
G00 G28 X0.0 Y0.0
G90
M1
M30



Slowley --SINGLE STEP ---RAPID Down
This should send the machine to Home

(ATC/APC/Loading Position)
G00 G91 G30 Z0.0
G00 G30 X0.0 Y0.0
G90
M1
M30

this will send the machine to 2nd ref position usually for an ATC or Pallet change position or loading if required