How To Measure The Wear Of A
- Clean the barrel of any remaining plastic or foreign objects. This
should be done while the barrel is still warm and can be easily
accomplished using PS&E Bore Brushes, Bore Brush Extension Rods,
Abrasive Pads and Copper Gauze.
NOTE: A bore gauge that still contains plastic can damage the
measuring head of a precision bore gauge.
- Once the barrel is clean and cooled to an ambient temperature,
complete the top two portions of the Customer Barrel Inspection Form.
Be sure to provide as much information as possible including
dimensions and counterbore type.
- Select the bore gauge extension that matches the bore diameter of
the barrel and apply to plunger on bore gauge.
- Set micrometers to match the original dimension of the O.E.M. bore
diameter (+0.001" for tolerance allowed). Hold the micrometers on
the plunger of the bore gauge and adjust the bore gauge dial to set
bore gauge to zero. Remove micrometers. Repeat this step to ensure
accuracy of set up.
WARNING: When performing a field measurement with a barrel still on
the machine, DO NOT measure the barrel bore behind the feedport. All
critical wear that affects the performance of an injection unit is on the
endcap side of the feedport. Severe damage can occur when the
measuring head enters the feedport of the barrel.
- Using a tape measure, measure the distance from the end of the
barrel to the approximate position of the feedport opening. This
distance is the maximum allowable distance that the gauge can travel
into the barrel without the measuring head entering the feedport.
NOTE: YOU WILL NOT TAKE MEASUREMENTS IN THE FEEDPORT. Leave
up to a 2" gap between the gauge and the feedport. Instead of the
feedport, you should concentrate on the stroke area and the transition
section of the barrel. This is the major area of concern.
- Place the plunger end of the bore gauge in the discharge end of the
barrel until the plunger touches the outside edge of the pilot end of
the barrel. Extend the gauge slowly into the barrel bore until desired
depth is reached WITHOUT entering the feedport.
- Using 1" increments, pull the bore gauge toward the discharge
end to measure and record measurements in the BORE MEASUREMENTS
section of the Customer Barrel Inspection form.
|NOTE: On a "new" Bore Gauge, the travel collar must be
removed prior to use. (The Travel Collar is placed on the gauge prior to
shipping to prevent the measuring head from getting damaged) The gauge
will not measure properly while the travel collar is on the gauge.
Always clean the barrel thoroughly prior to measuring.
Allow barrel to cool to an ambient temperature before measuring.
Move the bore gauge slowly to ensure proper measurements and avoid
damaging the bore gauge.
Do not apply oil to the bore gauge or barrel.
Do not push or jerk the bore gauge.
NEVER put bore gauge into a hot barrel or a bore containing
here for more information on Bore Gauges
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