v-chonk: does not return to xy safe-home location before homing z
I am having an issue with homing on a v-chonk, RatOS V2.1 RC3. When homing z the tool head stays at location 0,0, which puts the superpinda sensor off the bed. Since the sensor can't trigger, the bed crashes into the hotend. I have tried to center x and y before homing z, but the carriage moves from the center to the homing position when I do a G28 Z.
18 Replies
You can include
[safe_z_home]
home_xy_position: 90,90
It should work while the routine issue is solved.
MDFPereira... thank you for the suggestion. Tried modifying printer.cfg as suggested but it didn't make any difference in behavior. I don't know if this is helpful, but here are some other observations. 1) HOME_X, HOME_Y does not move the carriage. The debug information indicates expected values for the parameters, and both macros get called recursively 4 times. HOME_Z also does not move the carriage, and is called recursively. 2) The home buttons on mainsail seem to work correctly, except that the carriage is in the wrong position when Z raises toward the sensor. 3). G28 {X, Y or Z} has the same behavior as the buttons.
I will take a look at your files as soon as I can. Something very wierd…
Thank you! Your help is much appreciated. One question: DEBUG is reporting the following during homing macros: "Run Current: 1.09A Hold Current: 1.09A" , Is this correct? I thought that there should be 0 holding current when doing sensorless homing, true? It seems G28 Y and G0 Y90 do not work when this message is given.
holding current has no influence on sensorless. The value that matters is driver_SGTHRS
Made some notes on your printer.cfg
if you home via the buttons (not command) does it work correctly?
Homing by the buttons does work except the carriage stays at location 0,0 while homing z which defeats the proximity sensor. If I recenter the carriage after homing X and Y, when I home Z the carriage moves back to 0,0 before the activating the z drive.
Thank you for notes….
You welcome…
I will check again the homing routine a see if there is something messed.
An update. Today I started a fresh install with a new SD card. RatOS setup wizard completed successfully.. no strange stuff. So, no mods of any kind in the finshed firmware. The behavior was as described previously. As you said... wierd!
@Pinky do you still have the Chonky and working?
Yes
can you help. please?
@MDFPereira : I am now able to successfully home after changing the home_xy_position to 0,90, rather that 90,90. This works from both the buttons and G28.
I don't know if this will work when printing, but at least now I can start tuning. I appreciate your help. Thank you.
I don't know if this will work when printing, but at least now I can start tuning. I appreciate your help. Thank you.
It is homing Z in the centre?
Yes, homing Z is in the center and works well with the superpinda. home_x and home_y do not work. G28 x
if you set home_xy_position to 0,90 and it homes in the middle, something is wrong
did you try to home via the buttons instead of sending the G28 x?
Yes. They both work the same way... can't tell any difference.
Next steps; any suggestions?
BTW, there is another V-chonk builder with the same issue as I have... 03Julian04, in "chonk homing" thread.
Just wanted to let you know that all the weird symptoms I was seeing were due to using the default values for SGTHRS. I keep trying to increase the values for more sensitivity because the tool head was hitting the frame hard. Homing started to work correctly when I lowered the value to around 60. Just FYI.