Now we need to tell OpenPnP how far the nozzle(s) is/are away from the center point of the top camera. OpenPnP has a built in “wizard” to help set this offset, so we’ll use that to help us do it. You can read the OpenPnP docs about this step here.
NOTE: 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.
Offset Wizardmenu option. Leave the
Include Z?box unchecked. Read the instructions that OpenPnP provides in this window.
You can follow OpenPnP’s instructions using putty or flour, or you can use your homing fiducial. The rest of this page explains how to do this process with your homing fiducial.
Using an N045 nozzle tip, 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.
Store nozzle mark positionbutton.
Calculate nozzle offsetbutton. Hit the
Applybutton in the bottom right. You’ve now stored the nozzle offset!
v3machine, you have a second nozzle as well (N2). Perform the same steps above but for the second nozzle instead.