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Rotational offset

parts placed with a consistent global offset for only one nozzle

If parts placed have a consistent rotational offset, there are a couple potential root causes:

The nozzle tip is too small for the part you're picking

If the nozzle tip you've selected to pick a part doesn't apply enough suction force to the part, it can cause the part to shift on the nozzle tip, often causing a rotational offset that we call "pirouetting." Increase the nozzle tip diameter you're using for that part to prevent this.

The bottom camera needs a rotation adjustment

If parts from both nozzles are causing a consistent rotational offset, it could be that you need to adjust your bottom camera rotation. Navigate to Machine Setup -> Cameras -> OpenPnPCaptureCamera Bottom -> Image Transforms and adjust the value in the Rotation field.

adjusting camera rotation

The bottom vision pipeline for your parts needs adjustment

OpenPnP decides how to place parts onto your board based on what it sees in the bottom camera view. If a bright light or reflective surface in view of the camera is making OpenPnP think your part is a different size than it is, you'll see a placement error. Adjust your part identification pipeline.