Can Seam Scale The Can Seam Scale
with English units on one side and metric units on the
other, has several uses.
Basically, it is a handy pocket ruler calibrated in

thirty-seconds of an inch from zero to six inches, and

in tenths of a centimeter (millimeters) from zero to

15.2 centimeters.

 

1. The tapered end of the scale may be used to
scrape compound from the channel and curl of the

end in order to determine film weighls.

 

2. The scale is also used as a gauge for measuring
the curl height of a can end. This is done by taking a

2 inch (50.8 mm.) stack of ends, which will just fit in

the 2 inch (50.8 mm.) long slot of the scale, and then

counting the number of ends in the stack. Most can

makers have specifications for the maximum and

minimum number of ends for a two inch stack, which is

a function of the curl height, the can end material and

its thickness. The specification varies between aluminum

and steel/tinplate, between beer/beverage ends and

sanitary ends, and to some degree between one

diameter and another.

 

3. The remaining slots or notches in the scale are
useful as ”go-no-go” gauges for estimating seam

thickness, length, and body and cover hook lengths,

The seam scale is in no way designed to replace the

can seam micrometer or the countersink gauge. The

seam scale is used oniy for estimating or approximating

some can dimension measurements. For the accuracy

required in quality control and trouble shooting

procedures, measurements made with the countersink

gauge, can seam micrometer or seam projector are

required.