Operating Instructions 6-5 SG8 Manual
Cutting Counter Bores for Seat Rings:
Align the work piece as explained previously. Cylinder head deck surface must
be up.
Insert correct pilot into the valve guide. Mount the correct milling head cutter
on the milling head Adapter, Install milling head adapter into spindle adapter
Float the machine workhead while feeding the spindle down into the pilot until
milling head is few thousand from contacting the seat, release the foot pedal to
lock the floating head, rest the cutter gently on the surfaces and set the positive
stop with the seat ring between the stop rod and the quill clamp. This will ensure that
quill travel will be limited to the correct amount; or use the following alternative
method:
Set dial indicator for feed depth to zero, being certain the indicator has
sufficient travel to allow the proper depth of cut.
Push the green Spindle Start button to start the spindle rotation. Turn the spindle at
approximately 80 RPM - larger seats may require a slower speed; smaller seats may be run faster. Observe dial
indicator or positive stop. Cut to proper depth.
Swing the indicator out of the way after completing the procedure.
.
Tapping Operations:
Place the Jacobs chuck or Collet Holder in the spindle as explained previously. Install tap in the chuck, and
tighten.
Center over the hole to be tapped
Push green button Spindle Start to start rotation of the spindle and feed down the hole.
Choose a spindle speed sufficient for the tap (approximately 50 RPM), and allow the tap to feed the spindle
as it threads the hole.
When the proper depth is achieved, press to reverse the spindle rotation and left spindle return the
tap off the hole.
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