Delta LA200 Manuel d'instructions télécharger pdf (Page 17)

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CUTTING A SHOULDER

Use the parting tool first to reduce the wood to within

1/16” of the required shoulder and diameter (Fig. A18).

Clean the waste stock out with the gouge (Fig. A19),

then use the skew for the actual cutting of the shoulder

(Fig. A20), which is a duplication of squaring an end. The

skew then makes the horizontal cut, but in a different

manner from plain cylinder work. If the shoulder is long,

use the ordinary skew position for the outer portion of

the cut. At the angle between the horizontal and vertical

cuts, the heel of the chisel moves into a position tangent

between the skew and the cylinder (Fig. A21). In this

position, raise the handle of the chisel slightly to allow it

to cut while the tool moves along the rest. Use a very

light cut to produce smooth work. The heel of the skew

can be used for making the entire cut, if desired, but the

cut, whether in this position or any other position, should

not be picked up directly at the end of the stock.

Horizontal cuts started directly from the end of the work

will have a tendency to bite into the wood, often ruining

the entire piece. Always run off the end and not into it.

Where a very short shoulder makes this impossible, use

the skew in a flat scraping position. If the cutting tech-

nique is used, engage only with the heel of skew in a

very light cut.

Fig. A22

Fig. A20

Fig. A18

CUTTING SMALL BEADS

Beads can be scraped or cut. Using the spear chisel is

the easiest method of scraping, and works to best

advantage on beads separated by parting tool cuts

(Fig. A22). Scraping is slower than cutting and is not as

clean, but it has the advantage of protecting the work

from long gashes.

Cutting beads quickly and accurately with the small

skew is one of the most difficult lathe operations.

Various working methods can be used . The first cut is a

vertical incision at the point where the two curved sur-

faces will eventually come together. Make this cut with

either heel or toe of skew. Fig. A23 shows the use of the

toe. Place the skew at right angles to the work . The chis-

el is flat on its side at the start, and is evenly rotated

through the successive stages of the cut (Figs. A24,

A25, and A26). At the same time, the chisel is pulled

slightly backward to maintain the cutting point. The

entire cut is made with the heel of chisel. The opposite

side of the bead is cut in the same manner, one cut

serving to produce the full shape in each instance. This

action produces beads that are beautifully smooth and

polished, and the technique is well worth mastering.

Fig. A23

Fig. A26

Fig. A25

Fig. A24

Fig. 49

Fig. A19

Fig. A21

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Delta LA200 Manuel d'instructions Page 17

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