1. Wipe
and clean commutator spider area with lint free tissues dampened with
isopropyl alcohol. On armatures being repaired of the old design it will
be necessary to cut back the Mica or Nomex to within 1/2" of the
commutator segments to insure bonding of the ARS to the armature steel.
2. Apply
silicone rubber primer of D102 or DC1200 to commutator relief area, commutator
vertical plane, V-ring insulation area and spider surface. Primer can
be applied by brush or by wiping on with a clean tissue or lint-free cloth.
This primer is used to promote adhesion. A thin, even coat will provide
optimal adhesion.
3. Using
ARS Delivery System, fill peripheral area between spider lip and commutator
end bars. Using a plastic spatula or wooden stick such as a popsicle stick
or tongue depressor, smooth the surface of ARS even with the spider lip
and proceed with a thin coating up to within 1/4" of the commutator
surface. Allow for a radius in the corner. Care should be taken not to
make sharp 90 degree angles.
The best set-up for applying the ARS is when the armature is placed horizontal
in a jig that turns the armature. Under this arrangement it will take
no longer than five (5) minutes to insulate one spider area. Due to the
non-slump properties of ARS, parts can be removed immediately after application
is complete and positioned either horizontally or vertically. However,
the armatures can be worked on while stationary and standing on end. The
advantage to this type of operation is that no turning equipment is necessary.
The finished insulated armatures should be allowed to cure for 24 hours
before being spin balanced or placed in operation.
The Arc Resistant Sealant can be purchased in 5 gallon pails. When this
is done, the bulk delivery system can be used. In this system, an air-powered
pump is used to pump material through a hose directly to the delivery
nozzle that can be used to spread the ARS at the armature spider.
View Video of ARS Being Applied
For more information, contact: J o h n C a r r o l l at 847-891-2133 Chem-Spec Corporation E-mail to JFC@chem-spec.com
524 Morse Avenue, Schaumburg, Illinois 60193