we’ll need to do a simple calculation that tells us the percentage of stretch or shrinkage we need to
peorm. 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.
For objects with a larger middle section:
Shrink the artwork by dividing the drive wheel side diameter by the middle diameter and multiply by 100
to calculate the percentage of adjustment. For our example the calculation is:
Because our calculation percentage is less than 100, we need to shrink the artwork to 71.5% of its original
size. Adjust the size of your artwork in one axis only.
For objects with a smaller middle section:
Expand the artwork by dividing the drive wheel side diameter by the middle diameter and multiply by 100
to calculate the percentage of adjustment. For our example the calculation is:
Because our calculation percentage is greater than 100, we need to expand the
artwork to 129.6% of its original size. Adjust the size of your artwork in one axis only.
Other considerations:
In these two examples you’ll notice that the “middle” varies depending on where
you measure. Because of this, you’ll never be able to get every piece of artwork
peectly sized. Depending on how much room the artwork takes up, you may want
to experiment with the expansion or shrinkage of your artwork to fit your particular
glass shape.
Rotary Removal
1. Turn o the power before removing the Rotary Attachment.
2. Unplug and remove the Rotary Attachment.
3. Turn on the machine and the Home Position will return to the 0,0 point.
Drive Wheel Side
Diameter = 3.5” (89 mm)
Middle Section
2.7” (68.6 mm)
3.5”
2.7”
= 1.296 x 100 = 129.6%
- 133 -
SECTION 9: OPTIONAL FEATURES
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