Operating Instructions 6-4 SG8 Manual
Chapter 6 Spindle to Work:
When the cylinder head is clamped properly on the table
and adjusted, move the workhead to the first valve guide
by pushing on the food pedal.
At this point the spindle and workhead should be level
according to the position of the cylinder head.
Most machining operations require the spindle to be directly
centered over the work to be performed. This is usually
accomplished by air floating the workhead above the area
to be machined then manually lowering the spindle to the
pilot shank with the spindle adapter sleeve on the down
position, once that you have the toolholder about ½” in to
the pilot shank release the sleeve to the upper position to
achieve perfect centering according to the position of the
pilot and lower the toolholder into the pilot manually until
reach the proper height or until the carbide tip is a few
thousands from the seat. Do not make contact with the seat surface, the work head should be floating at all
the time; once it’s down release the foot pedal to Note: when machine the seat, the sleeve should be in
upper position. The work head should be in float mode at all times
If the pedal is released too quickly, the float head may bounce. True centering may
not be achieved if this happens. Slowly releasing the air float pedal gives the best results. Removing your
hands completely from the work head during the final seconds of centering will insure that you do not
negatively influence centering accuracy.
Fine Feed Engagement:
To engage the fine feed mechanism it is necessary to push
inward on the spindle feed handwheel while rotating the fine
feed handwheel until engagement is achieved. To disengage the
fine feed simply pull outward on the spindle feed handwheel.
Core Drilling and Reaming Valve Guides:
A special drive adapter is supplied to accept core drills and reamers.
Align core drill with valve guide by inserting core drill pilot in guide as head of machine is floated and centered
Push green button Spindle Start to start the spindle, verify correct rotation. Operate at 85 RPM, feed
with moderate pressure until it clears the bottom of the guide.
Raise Quill to bring core drill above upper end of valve guide. Stop spindle by pushing Spindle Start
button. Select and install correct reamer. Repeat step 2 at 150 RPM.
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