14
SHAPING WITH COLLARS
AND STARTING PIN
When shaping with collars and starting pin, the following
rules must always be followed for good work and safety
in operation.
1.
Collars
MUST
be smooth and free of all gum or
other substances.
2.
The edge of the work to be shaped
MUST
be
smooth, as any irregularity in the surface which rides
against the collar will be duplicated on the moulded
surface.
3.
A portion of the edge of the work
MUST
remain un-
touched by the cutters in order that the collar will have
sufficient bearing surface. Fig. 39 illustrates the wrong
way for the operation while Fig. 40 illustrates the right
way.
4.
The work
MUST
be fairly heavy in proportion to the
cut being made as shown in Fig. 41. Under
NO
cir-
cumstances should short work of light body be shaped
against the collars as shown in Fig. 42.
5.
When shaping with collars and starting pin, the Safe
Guard Il spindle guard, supplied with your machine,
should always be used.
Fig. 39
Fig. 40
Fig. 41
Fig. 42
POSITION OF COLLARS
1. The collars may be used in any of the following
positions: above, below or between two cutters.
2. When the collar is used below the cutter, as shown
in Fig. 43, the progress of the cut can be observed at all
times. However, any accidental lifting of the work will
gouge the wood and ruin the workpiece.
3. When the collar is used above the cutter as shown
in Fig. 44, the cut cannot be seen, yet this method offers
some advantage in that the cut is not affected by slight
variations in the thickness of the stock. Also accidental
lifting of the work will not gouge the workpiece. Simply
correct the mistake by repeating the operation.
4. The collar between cutters method, as shown in Fig.
45, has both the advantages of the first two methods
and is frequently used where both edges of the work are
to be shaped.
Fig. 43
Fig. 44
Fig. 45