Nozzle Offset
Now we need to tell OpenPnP how far the nozzles are away from the center point of the top camera. There are multiple strategies you can use to calculate this. One way is to use OpenPnP's built in Offset Wizard. You can read the OpenPnP docs about this step here.
See also our setup video.
Tip
OpenPnP has some new methods of calibration using a secondary fiducial at a different Z height, and a small piece of paper. If you'd like to explore this method of calibration, you can find the OpenPnP docs about this process here. This process requires making and installing a calibration rig, 3D Units per Pixel calibration, and Advanced Camera Calibration.
-
Click on the "Expand" checkbox to open all of the features about your machine.
-
Click on
Heads > ReferenceHead H1 > Nozzles > ReferenceNozzle N1
-
Read the instructions that OpenPnP provides in this window. This guide will use the homing fiducial as the starting point, instead of using putty or flour. But those are valid strategies as well if you'd prefer them.
-
Select the
Nozzle: N1 - N045 (Head:H1)
from the machine controls dropdown. -
Jog the nozzle so that it is just barely touching the datum board, and perfectly centered over the homing fiducial. We recommend looking for the shiny edge of the gold fiducial poking out from under the nozzle tip to determine if you've centered it correctly.
-
Click
Store nozzle mark position
. Do not navigate away from theHeads > ReferenceHead H1 > Nozzles > ReferenceNozzle N1
tab while running the wizard. -
Jog the X and Y axes to bring the top camera directly centered over the homing fiducial. Again, do not switch away from the Offset Wizard tab.
-
After centering the homing fiducial in the top camera view, click
Calculate nozzle offset
. -
If you have a v3 semi-assembled LumenPnP machine, start again from step 1 to calibrate your right nozzle. Place the nozzle on your right toolhead, and use
Heads > ReferenceHead H1 > Nozzles > ReferenceNozzle N2
section.
Next Steps
Next is Bottom Camera Position.