Nordson EFD E2V - Concepts (continued); Understanding System Offsets

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EV Series Automated Dispensing Systems
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About Offsets
Offset is the distance between two components. The system must be “taught” the following offsets before any
programs are created:
• Camera-to-tip offset: the distance between the center of the camera view and the center of the dispensing tip
(this is an XY offset).
• Tip-to-workpiece offset: (1) the distance between the bottom of the tip and the workpiece for contact
applications or (2) the distance between the bottom of the nozzle and the workpiece for non-contact
applications (this is the Z height clearance).
These offsets must be properly calibrated to make sure the dispensing tip follows the same path as the camera and
to compensate for slight variations in height that occur when a dispensing tip or nozzle is changed.
Once the offsets are properly set up, you can automatically update offsets at any time by clicking Needle XY Detect
and/or (if your system includes the tip detector) Needle Z Detect (refer to “How to Automatically Update Offsets” on
page 48). Offsets should be updated as follows:
• At initial startup.
• Any time a component installed on the Zaxis (such as the syringe barrel or camera) is moved.
• Any time a dispensing tip or nozzle is changed.
About Programs and Commands (continued)
Best Practices for Programming
• Insert dispense setup commands at the beginning of the program.
• Insert mark commands before any dispense commands.
• Insert dispense commands after inserting setup and mark commands.
• Insert the End Program command at the end of all programs.
Illustration of camera-to-tip offset (also referred to as XY offset) and tip-to-workpiece offset (also referred to as tip height or
Zclearance)
Camera-to-tip
XY offset
Tip-to-workpiece
offset
(Z clearance)
Camera-to-tip
XY offset
Tip (nozzle)-to-
workpiece offset
(Z clearance)