Rottler S7AD, Operation And Maintenance Manual

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Section 5 Operating Instructions S7AD / S8AD Manual
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5-14
Cylinder Heads with Protruding Valve Seats
Some cylinder heads have valve seats that protrude into the head gasket surface. Valve seats are made
out of a wide variety of material. Some are very hard or difficult to cut when compared with the aluminum
or cast iron head surface. In many cases it is best to cut the valve seat down below the head surface in a
seat and guide machine. This takes a few more minutes when cutting the valve seats but it can save a lot
of time and minimize tooling cost when surfacing the head.
The following inserts use Rottler 3/8” (9.52mm) Toolholders supplied with Rottler Surfacing Cutterheads:
6303S
A round 3/8” IC, single sided, CBN Insert. For use on aluminum blocks with iron liners and aluminum
heads with steel pre-combustion chambers. When cutting aluminum heads with pre-combustion
chambers it is best to use Rottler’s spray mist coolant system or Goodson’s HPS-10 High Performance
Resurfacing Spray. RPM speeds with a 14” cutter range from 650-750 RPM.
6303U
A round 3/8” IC, single sided, CBN Insert. This insert does an excellent job when cutting hard cast
iron blocks and heads of a single material or bi-metal. This insert is the best to use when machining
compacted graphite cast iron heads and blocks often found in the performance industry. RPM speeds
with a 14” cutter range from 650-750 RPM.
6303R
A round 3/8” IC, single sided, CBN Insert. For use on cast iron heads with steel pre-combustion
chambers. RPM speed with a 14” cutter range from 600-700 RPM and with an 18” cutter range from 500-
600 RPM.
6301I
A square 3/8” IC, double sided, ceramic insert. For use on cast iron heads with pre-combustion
chambers. You can make one finish cut and two rough cuts with each new cutting edge. Always use a
new edge when making a finish cut. Use 350-500 RPM on a 14” diameter cutterhead.
6301V
A round 3/8” IC, double sided, ceramic insert. For use on cast iron heads with pre-combustion chambers.
You can make one finish cut and two rough cuts with each new cutting edge. Always use a new edge
when making a finish cut. Use 350-500 RPM on a 14” diameter cutterhead.