– 6 –
2.6
Porcelain/Enamel over Steel or Cast Iron Sinks
Using a small diameter carbide tipped drill, drill a pilot hole completely
through the porcelain and the material underneath. Remove any metal chips
that fall into the sink to prevent rust stains. Place the spring-loaded porcelain
cutter bit in to the drill chuck. Make sure the pilot guide is inserted tightly.
Insert the pilot guide onto the pilot hole. Push down gently on the drill motor
to apply light pressure to the porcelain surface. Start the drill motor, turning
as slowly as possible. After the initial cut has started, motor speed may be
gradually increased. The cut may require three to four minutes to complete.
Going faster could result in excessive chipping. Be sure a complete ring has
been cut through the porcelain to the metal underneath.
Place the finish hole saw into the drill chuck. Make sure the pilot guide is
inserted tightly. Insert the pilot guide into the pilot hole. Begin cut using a
slow speed and light pressure until the porcelain has been penetrated to
the material underneath. Remove the saw from the hole and clean all debris
from the porcelain surface. Reinsert saw into the hole and cut through the
remaining material.
[NOTE: This procedure is for the non air gap faucet provided.]
Figure 5
Step 1.
Pilot Drill
Step 2.
Spring loaded
porcelain saw
(Relton cutter)
Step 3.
Finish hole saw
