Section 9: Standard & Optional Machine
Features
146
Stretching or shrinking your artwork for objects with multiple
circumferences.
The instructions below show you how to shrink or expand your artwork to
accommodate a cylinder where the area being engraved is a different circumference
than the circumference at the drive wheels. The rotary attachment works with the
assumption that the cylinder is the same circumference from end to end and that your
artwork doesn’t need to be stretched or shrunken. But some cylinders have a big
difference in circumference from the middle to the ends that it affects how the
engraved image looks, so sometimes it’s necessary to stretch or shrink your artwork
so it looks proportional on odd shaped items. The photo below shows a glass that fits
this category.
Most artwork will look acceptable on this glass without stretching or shrinking, but
because the middle of the glass is a smaller diameter than the ends, some artwork will
look compressed (more as an oval than a circle), so we’ll want to adjust the artwork
before engraving.
To determine how much to adjust your artwork, we’ll need to do a simple calculation
that tells us the percentage of stretch or shrinkage we need to perform. You can use
either the diameter or the circumference to make the calculation; just don’t mix the
two.
Determining whether you use diameter or circumference is a matter of which one is
easier to measure. If you want to measure circumference, use a flexible ruler and
wrap it around the glass. To calculate circumference, measure the diameter and
multiply by Pi (3.1416):
Circumference = Diameter x 3.1416.
This glass has a circumference of 4
inches (100 mm) at the ends and a
circumference of 3.2 inches (81 mm)
in the middle, where we want to
engrave.
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