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The electroplating of small components is possible
with the use of perforated polypropylene cylinders or
barrels. These cylinders are loaded with the parts to
be electroplated, closed shut, and the cylinder is moved
manually or by an automatic hoist. The parts are run
through a complete cycle until the end result is achieved.
Unlike in rack plating where the parts to be plated
are fixtured to a rack or wire and held stationary,
barrel parts are continuously tumbled throughout the
whole process. Because of this continuous movement of
parts, a flexible, cable type, interior cathode is required.
This flexible interior cathode, or electrical contact
is commonly referred to as a dangler.
Danglers contacts allow for the process load to move
or tumble while keeping good electrical contact. While
there are other types of dynamic cathode contacts, like
hairpin and chain, flexible cable danglers are the most
common.
To determine the proper length of the dangler that
you need for your plating barrel cylinder, you will
need to measure the total distance from the electrical
contact point on the superstructure, through the barrel
head, to a point 1/3 of the distance into the barrel.
The cathode head of the dangler should touch the bottom
of the barrel at the point indicated on figure #1.
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