homing issue
Hello
When I try to home my Ratrig which is a 500mm build. The home z shows 450 and stops at 448. Upon reversing the direction of z motors it goes up and first error shows is no endstop for z and when I redo it after that it crashes on the tool head.
9 Replies
Seems like you have Z offset set very high?
the config file printer_data/config/RatOS/printers/v-core-3/500.cfg sets "position_max: 500".
If i understand this right it's just the z_offset in the [probe] section in printer.cfg that should make a difference of how much height it actually has available.
Sorry, I misread.
(thought you meant that you didn't have the full printer volume in Z available.)
Your probe is either too far from the nozzle (in Z) or the probe isn't reacting at all.
This can happen if:
* The probe is mounted too far up from the nozzle - then the bed hits the nozzle before the probe triggers.
* The bed is tilted too much, same problem as above.
* The probe is wired wrong so it doesn't react.
What probe do you have?
Have you checked that the probe triggers if you try to trigger it manually?
The probe does trigger manually and it's the superpinda probe
Ok. how far above the nozzle is it mounted?
How do I change the home value to 500? Or zero?
Or 150 like the x and y?
That value should reflect the position on the bed.
150, 150 is the center of a 300mm printer.
I think you can ignore that for now.
The probe should trigger before the bed hits the nozzle.
Do you have the springsheet metal mounted on the bed or just the aluminium?
"PEI" sheet
https://ratrig.com/rat-rig-superpinda-probe-by-pepperl-fuchs-inductive-5vdc-sensor.html
The probe should trigger within about 2-2.5mm from the steel sheet, so the probe can't be mounted higher then this relative to the nozzle tip or the bed will crash into the probe.
Rat Rig "SuperPinda" probe by Pepperl & Fuchs (Inductive 5VDC Sensor)
Rat Rig "SuperPinda" probe by Pepperl & Fuchs (Inductive 5VDC Sensor)
When homing it should lower the bed first (not raise it, if it raises it then it's going the wrong direction) then it should home X (Move toolhead to left on gantry until endstop) then home Y (Move gantry to back of printer until endstop), last it should center on the bed (X / Y should be at 250,250 for a 500) then it should home Z (move bed up towards the nozzle) until probe triggers, and the probe should trigger before the bed hits the nozzle.
Check in printer.cfg that you have commented out the default 300.cfg here and have removed the "#" before the line saying 500.cfg:
(this is from my printer which is a 400 so 400 is uncommented)
If unsure, just download the printer.cfg from the printer ui and upload it here so we can check.
Before moving on to next step - z-tilt make sure to check that the bed is quite level - less then a centimeter in height difference between all three lead-screws is good just to be safe so you don't crash / scratch the bed..
And maybe also mount he PEI sheet upside down initially (assuming you have a single-sided pei sheet so if you were to crash you crash into the non-coated side) - just until you get this working properly.
Hey guys
The homing thing worked
The problem now is on the ratos UI the up arrow makes the bed go down and down arrow makes it go up.
If I reverse directions. During homing the printer goes down instead of moving upwards
just reverse the controls in mainsail