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Third Edition, Nov 2016
ACS V4.2
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40
Section E. Seam Measurement
For this process you will require a couple of basic tools included with your equipment.
A pair of side cutters strong enough to go through the aluminum of the can.
A micrometer to make the very fine measurements required.
Refer to your Can Seam Specifications sheet (Table 10 Can Seam Specifications on Page 42) for the tolerances allowed
when making these measurements.
E.4.1
Visual Evaluation
Before taking any measurements of the can, you can start the evaluation process by simply taking a look at the seam. You
should see a nice, smooth, consistent rolled seam. There should be no damage to the body or cover of the can; this includes
any warping or impact points, and fractures of the seam itself.
E.4.2
Seam Height
If the can passes a basic visual inspection and there are no obvious problems, you can move on to more precise
measurements with your can seam micrometer. It is best to check the seam height and width before opening or cutting
the can. For best results use a can seam micrometer for measuring seam width. It’s design enables you to get consistent
measurements. Using your micrometer measure the distance from the bottom to the top of the seam at various points
around the can. The seam height should be relatively consistent, although some slight variances are to be expected.
Refer to Table 10 Can Seam Specifications on Page 42 for Seam Specs.
Note: to properly measure seam width place your finger on the micrometer as you tighten the thimble sleeve. Thimble
sleeve must be tightened to just a sufficient degree (and no more) that when you remove your finger (see Figure 36) the
micrometer does not move or sag.