Craftsman 351.21 7150 Manual De Instrucciones página 8

Observe thespeed c hart ( seepage 15). F orexample, a 2"
square t urning u pto18"long should r unat1100 RPM for
"roughing". Rotate t hewood byhand tomake sure thatthe
corners d onotstrike thetoolrest a ndverify thattheindex-
ingpinisnotengaged.
Figure 17
INDEXING
Refer to Figure 18.
The
spindle
pulley has 24 equally
spaced
holes (15 °
apart).
The
index pin passes through the spindle pulley, engages with one of
the 24 holes and locks the spindle from turning while you put a
mark on the workpiece.
Spindle Pulley
Figure 19 -Bowl Turning Rest
CAUTION:
Do not try to push this support when cutting. Do
not try to mount work so large that the motor must strain to
turn it. If you wish to experiment with this technique, do so
with soft woods. Let the heavier, harder wood come later.
To prepare the lathe for outboard turning, unlock the head-
stock by pulling up on locking handle. Remove pin and rotate
headstock 90 ° . insert pin at outboard alignment hole and
secure headstock with locking handle.
Figure 18
index Pin Lever
For example, to locate the position of six flutes on a cylinder:
Open the upper rear cover.
Pull back on index pin lever until the index pin engages
one of the 24 holes in the spindle pulley.
• Adjust the 12" tool rest to the centerline of the workpiece
and make a mark.
Push index pin lever forward to release pin. Slowly rotate
the workpiece until pin is located 60 ° (4 holes) from initial
position. (The spindle pulley has a degree scale). Engage
index pin into the pulley and place another mark on the
workpiece.
Continue these steps until there are 6 marks on the work-
piece.
Bowl turnings or wheel turnings can be marked in the
same manner.
WARNING: The indexing pin must be disengaged for all
other operations on the lathe.
OUTBOARD TURNING
This technique makes it possible to do jobs on this machine
that are too large to mount conventionally. It is straight forward
faceplate turning, except, because of the work size, caution
must be taken and speeds must be restricted to minimums. If
you anticipate doing outboard turning you must use a bowl
turning rest (see Recommended Accessories, page 27). The
bowl turning rest is attached to the lathe bed.
Figure 20 - Outboard Turning
USING WOODWORKING CHISELS
SELECTION OF CHISELS
Better chisels have handles approximately 10" long to provide
plenty of grip and leverage. Sharp tools are essential for clean,
easy work. Select tools that will take and hold keen edges.
GOUGE SKEW PARTING TOOL
SPEAR POINT FLATNOSE ROUND NOSE
Figure 21 -The Six Commonly Used Chisel Types
THEORY OF TURNING
The two classes of chisels are those intended primarily for
cutting, and chisels used only for scraping.
• The cutting chisels are the gouge, skew and parting tool.
These are the most used. They are commonly sharpened
to a razor edge by honing on both sides.
• The scraping chisels are the flat nose, round nose and
spear point. These are not honed on the flat sides - the
wire edges produced by grinding are left on to aid in the
scraping process.
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