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### Author Topic: work zero in mach 4  (Read 5804 times)

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#### lumber60

• 110
##### Re: work zero in mach 4
« Reply #10 on: August 02, 2018, 04:22:27 PM »
By dummy i mean me

#### Cbyrdtopper

• 796
##### Re: work zero in mach 4
« Reply #11 on: August 02, 2018, 05:01:08 PM »
Ken,
Z Axis moving down is negative.  Be sure that movement is correct.
The top of your part is usually set to Work Offset Z 0, when the top of your part is set to Z0 then any work on your part will be negative.
How are you getting your G Code, from CAM?

#### joeaverage

• 6,596
##### Re: work zero in mach 4
« Reply #12 on: August 02, 2018, 05:01:46 PM »
Hi,
if you are observing MACHINE COORDINATES in your DROs then I would expect Z=0 to be at the top of travel
and moving downwards would go more negative.

If you are observing WORK COORDINATES then I would expect a positive number say 100 mm at the top of travel and
as the Z axis goes downwards it would decrease until the surface of the material at Z=0 and below the surface
of the material would be negative. Thus if you stopped at Z=-1mm then the tool is cutting 1mm off the top surface
of the material.

Craig
My wife left with my best friend...
and I miss him!

#### lumber60

• 110
##### Re: work zero in mach 4
« Reply #13 on: August 02, 2018, 05:36:15 PM »
My z axis dro reads shows neg and the axis is going up with zero in the down position

ken

#### lumber60

• 110
##### Re: work zero in mach 4
« Reply #14 on: August 02, 2018, 05:39:32 PM »
I double checked it and what i said previously is correct.

Ken

#### joeaverage

• 6,596
##### Re: work zero in mach 4
« Reply #15 on: August 02, 2018, 05:45:38 PM »
Hi Ken,
that is the correct direction but normally Z=0 is at the top. The machine coordinates don't matter
that much, Mach uses them. You will use Work Coordinates.

Anyway once you hit <Zero Z> on the surface of your material you'll be set.

Craig
My wife left with my best friend...
and I miss him!

#### lumber60

• 110
##### Re: work zero in mach 4
« Reply #16 on: August 02, 2018, 06:24:47 PM »
OK, the machine plunges faster than retracts, it works away from material rather than into it

I will never run out of material this way, LOL.

ken

#### joeaverage

• 6,596
##### Re: work zero in mach 4
« Reply #17 on: August 02, 2018, 06:39:55 PM »
Hi,
whoops I think I'm confused my self now!

In WORK COORDINATES jog <Z+>. Does the Z axis go up? If so every thing is correct. If not
then the Z axis is reversed relative to industry wide understanding.

Craig
My wife left with my best friend...
and I miss him!

#### lumber60

• 110
##### Re: work zero in mach 4
« Reply #18 on: August 02, 2018, 06:54:43 PM »
OK, Are work and machine coordinates the same or is this a sample of the two names for one function???

Yes, z up and down in machine coordinates. Down is home zero up is negative

ken

#### joeaverage

• 6,596
##### Re: work zero in mach 4
« Reply #19 on: August 02, 2018, 07:08:32 PM »
Hi,

Quote
Are work and machine coordinates the same
No they are not the same.

Machine coordinates are relative to the 0,0,0 set by your home switches.
Work coordinates you can shift around and are usually zeroed to one corner of the piece of material.

The Work Coordinates are numerically equal to the Machine Coordinates + the Work Offsets.

Your description is still confussing. Hit <Z+> jog button. Does the Z axis go up?

Craig
My wife left with my best friend...
and I miss him!