BlackBox controller always reverts back to work perimeter size once homing cycle is completed

Hi folks
I’ve made a few workbee style machines & I’ve always used the BlackBox controller which - I find is very robust, easy to assemble, setup & use. I am controlling it with the openbuilds software.
The problem I always seem to be having is once I’ve done the Setup & do the homing cycle - the home co-ordinates alway revert back to the work space dimensions (X:814mm Y:814mm X:92mm), that I’ve input in the work area settings (minus the 2mm sensor travel) I was expecting them to be (X:0 Y:0 Z:0) after homing!
It alway reverts back to (812mm/812mm/2mm) even after blackBox reset!
Please can someone help me - thanks!!

 

Gnea/grbl - explains it all - thank you for your very quick response! The reason for my frustration is - I want to use the (soft-limit) to protect my machine from smashing itself up!
But when I do this, it always gives me the alarm (something like: exceeds work area dims)
How do I set home coordinates to be 0,0,0 once it’s done the homing cycle? then I can use the (soft-limit) option.
I’m not a grbl coder - so layman’s ad ice please! Thanks so much you guy!!

 

Thanks Peter
I’ve done this several times - but I always have the same problem - I always have to revert to turning of off the (soft-limit).
The G-code file for the cutting - has always been smaller than the machine work area - so its not the sending g-code file.

 

I’m using (T8x8)lead screws - with the nema23 positioned @ the back of the machine.
What if I invert the signals to the nema23’s & invert the homing cycle - via the openbuilds controller program.
Then change the polarity of the wires to the nema23’s

 

Hi peter - the problem is not from the g-code file - this persistent problem is happening prior to the sending g-code file - before I even load the work file.

 

I’m using (T8x8)lead screws - with the nema23 positioned @ the back of the machine.
What if I invert the signals to the nema23’s & invert the homing cycle - via the openbuilds controller program.
Then change the polarity of the wires to the nema23’s

 

Thanks Peter - for your help - I will post the serial log tomorrow- when I’m back @ my office (where the machine is)

 

Hi Peter

After I do the homing cycle, the co-ordinates go to (X: -812mm,Y:-812mm Z: 2mm)
When I set all to Zero & save it, Its works fine, but when I disconnect, turn off the BlackBox & reconnect it, it goes back to the (X: -812mm,Y:-812mm Z: 2mm) settings after the home cycle & it won't allow me to Jog any of the Axes.

Grbl Error (error: 15 Jog target exceeds machine travel. Command ignored [ $J=G91G21Y10F4978 ])

CNC machine size - (X: 814mm,Y:814mm Z: 92mm)
Homing switch pull-off distance - (2mm)

The reason I'm asking you is: It appears to be a control software issue, because when I use UGS platform, everything works just fine, with the (soft limits on) & the soft limits work with UGS platform. I Love your programme & I don't want to use UGS unless i have too.

PS: would it be possible to put a lock, or colour code on the (Set Pre-Defined position G28.1). Its right next to the (Go to Pre-Defined position G28) & quit often it gets selected in error (looks very similar), when you in a hurry! This in turn sets your new position, when all i wanted to do was go to the Pre-defined position.

Thank you in advance!