reversing homing direction without inverting axis?

[draughted]

I'm having a great time with my rockcliff fixed gantry , but for one small thing my homing sequence is all messed up.
the x and y axi are homing beyond the confines of the magical red cube on the display and so that when ever i home all axis it complains that the work goes beyond the work area.

does any one know thew fix?

[chester88]

What version of EMC are you using? Did you use Stepconf to make the configuration?
If you are using shared home and limit switches ( most likely) then in your INI file
There should be an entry such as:
HOME_IGNORE_LIMITS = YES

[BMG]

you might specify a work envelope slightly larger than the working area you use.

In my case, I have a 48X24X4 inch work area. In reality, I can squeeze out a bit more. to avoid some of the limit errors, I specify in my setup a lower left point of -0.5,-0.5, -4.25 and an upper right corner of 48.5,24.5,1.0

My machine can actually reach these limits but I then specify my work limits of 0,0,-4.0 and 48,24,0.5.

My gcode never goes into these regions so I can care less, but it helps.

[draughted]

well i'm using 2.2 and yes i used the stepconfig and
using a limit as a home.
but i all ready have home-ignore-limit as yes

the problem could be a soft limit issue but i don't think so

what really happens is the home goes in the wrong direction

say i start in the bottom left corner
and home all
it will head toward the top right and the screen position will suddenly revert to the bottom left when it really just moved to the top right

typically my step config file looks like this:

home location: -15
travel: 0 - 300
home switch location: 5
home search velocity:5
pposite:

[chester88]

Did you try changing 'opposite' to 'same' ?

[draughted]

yeah but i have had some real scares with the axis breaking limit switches and going hay wire.

[chester88]

Please explain why home switch location is 5 and home is -15.
which limit is shared with home?
not saying its wrong just need it explained.
can you post your stepconf and/or INI files somewhere?

[draughted]

i was having trouble with my sequencing and a larger negative number just seemed safer. after that is i crashed my z a few times.

[draughted]

truth is its either get this sorted or never home again.
ive been running back to stepconfig to reposition my tool
and start from there. but every time its going though the whole process.
not to say a bit of a hassle.

[acondit]

Change the sign of your homing velocity. If it is positive, then make it negative.

Alan

[draughted]

alan! thats brilliant!
and now seemingly obvious!

i almost crashed again, but reversing the home location saw me through it.

thank you.