A sag check is a test that determines the amount an indicator
bracket will sag at a given distance.
How to perform a sag check
the brackets on a sturdy piece of pipe the same distance they will be when placed on the
equipment. Zero both indicators on top, then rotate to the bottom. The difference between
the top and bottom reading is the sag.
Sag will always have a negative value, so when allowing for sag on the
vertical move always start the dial indicator with a plus(+) reading. For example if
you have .002" sag; when you zero your indicators on top put the needle on a +2
instead of zero to compensate for the sag.
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