about G28 homing

[fitztu]

Hello, I am now trying to swift from Mach3 to uccnc.
I always use g28 homing in mach3 but i can not find where can I set G28 homing in Uccnc.
Does uccnc support G28 homing? or I have to use G53 instead?

[cncdrive]

I don't know what do you mean by "where can I set G28 homing in Uccnc"? What do you want to set?
Yes, the UCCNC supports the G28 code.
The supported g-codes list you can find in the Help/supported g-codes tab page in the software and in the UCCNC manual you can find some longer descriptions.

[fitztu]

I mean this
https://drive.google.com/file/d/10HG3lbI8E4D0FxmreB-UZ40J5WpCQSwv/view?usp=drivesdk
In mach3 i can set g28 home location coordinates
But I can not find where could set in uccnc

[cncdrive]

You set the home coordinates with the home offset.

[ger21]

Mach3 allows you to set a Home position separate from the actual home switch position.
UCCNC does not.
In UCCNC, your G28 Home position is the home position defined by your home switches.

[fitztu]

I tried to set home offset.
If I set home offset for z axis on 200 then i input g28 g91 z0
the z axis will at first move to z0 then back to z200 z axis will not move to z200 directly, this is still not what i want.
So anyway, now I am now using g53 instead.
I think maybe in the future add this separate home position feature is a good idea for uccnc because that make user more flexibility to control their machine.

[cncdrive]

The RS274NGC standard says that the G28 has to work like that. The axis position is programmed with G28 has to be an intermediate coordinate.
The axes has to move to the intermediate position and after it moves to the home position. It is clearly defined by standard that it has to work like that.

The other thing is that if you code G28 then there is no intermediate position, then the axes move to the home position directly.
However this can be sometimes problematic because there is no order of movement, but a single linear interpolation from current point to home point.

I'm now not sure if G91 influances the G28 or not, will have to check. I'm also not sure if it has to or not...

[ger21]

If I set home offset for z axis on 200 then i input g28 g91 z0

If you just program G28 by itself, does it then do what you want?

[Battwell]

if you just want to send machine home- use p1 or p2 button and edit the m200, m201 macros to the position you want. (macro per button)
you can also call those macros from your code directly.

[fitztu]

Thanks my friends,
I will test only g28 without g91 today when i get home to check whether is different between with g91.
For me I used to use g28 to call Z axis to home between two toolpath in mach 3.
Now i would like to switch to uccnc becaus my control computer is really old.
So i am checking the g code what i used to use to see if they are still working or with the same behavior in uccnc.
Then i found the behavior in g28 is different from mach3.
So now i am useing g53 with z offset instead.
I have tested some toolpath with g53 and they are working without problem only i have to rewrite my post processor but anyway its working.
And the other i have too deal with is the macro, maybe with 2017 screenset is the fastest way to make me switch to uccnc.
But I saw there is only 4 axis on 2017 screenset.
Is there can display for 5 axis? If not then there will be a problem for me.
By the way, I think the basic macro should be original build-in in software.
For example, tool auto zero, find edge and find hole center because this make software really full function.
Without that is like photoshop without filter or basic brush and why not make people easier to use?
Uccnc is not only for pro guys but also for the people who is interested in and want to join us.
Actually more easier to use, more people come in then you sell more or they keep their mach3.
I will try tonight thanks you guys!