Duplicating Flat Keys - Foley Belsaw 200 Adjustment & Operation Instructions

DUplICAtINg FlAt KEYs

Now, we will cover the duplication of flat keys and how to change over from making cylinder keys to making
flat keys.
When changing from one cutter to another, it is always necessary to recheck the depth adjustment since every
cutter varies slightly in diameter. There are very few cutters that will be the same diameter down to two or three
thousandths of an inch. We can compensate for this difference in diameter by using the micrometer instead of
going to the trouble of resetting the depth adjustment. If the new slotting cutter for steel keys is larger than your
current cutter, turn the micrometer to move the guide farther out towards you. If the cutter is smaller, turn the
micrometer to move the guide in away from you.
Figure i
First, let's study the construction of the micrometer again and look at how it works. Figure I shows how to read
a micrometer. I-1 is the CYLINDER, I-2 is the BARREL, and I-3 is the GUIDE. The small graduation marks
shown at I-4 on the barrel represent one thousandths of an inch (read .001"). Each time the barrel is turned from
one of these marks to the next, it moves the I-3 guide back or forward one thousandth of an inch (.001").
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