Appropriate Sensor Clearance...

Andy Routsis
Vote 0 Votes
This question highlights an often overlooked concern when using pressure sensors mounted underneath ejector pins.

How much of a gap should be used between the pressure sensor and the ejector pin?

My Response
The general recommendation from most manufacturers is between 0.25-0.5mm or 0.010-0.020in.

In reality, this specification refers to the clearance between the top of the ejector pin head and the counter-bore in the ejector plate. Most mold makers use a similar ejector pin clearance even when a sensor is not being used.

Additional Thoughts
The purpose of this clearance is to ensure there is no preload on the sensor, especially if any dirt gets beneath the sensor. Such a preload will destroy the sensor and provide erroneous pressure readings.


No TrackBacks

TrackBack URL:

Leave a comment

About this Entry

This page contains a single entry by Andy Routsis published on July 20, 2010 10:00 AM.

Regrinding Sandy Plastic... was the previous entry in this blog.

Intensification Ratios for Electric Molding Machines... is the next entry in this blog.

Find recent content on the main index or look in the archives to find all content.