Craftsman 351.21 7150 Manual De Instrucciones página 17

DEEP RECESSES
• The first step is to remove as much wood as possible by
boring into the center with the largest wood bit available.
This can be accomplished as illustrated in Figure 59. Be
careful to measure in advance the depth to which drill can
be allowed to go.
Figure 59 - Boring to Depth
• Now, remove the bulk of the waste (to rough-out the
desired recess) by scraping with the round-nose chisel or
the gouge. Remove up to within _/J' of finished size in this
manner. Finish off the inside circumference by scraping
with the spearpoint chisel or skew. Smooth the bottom of
the recess by scraping it flat with the flat nose chisel.
• Proper support must be provided at all times for the scraping
chisels. Several tool rest positions are shown in the accom-
panying illustrations. Always endeavor to position the part of
the rest that supports the tool as close to the working surface
as possible. The depth and squareness of the sides of the
recess can be quickly checked by holding one of the straight
sided chisels and a combination square as shown.
Figure 60
FANCY FACEPLATE TURNINGS
PREPARING A PLUG CHUCK
A plug chuck is an auxiliary wood chuck mounted onto a face-
plate. The chuck can be any size diameter, but it should be
about 1 _/2"thick for stability. The wood chuck should be pro-
vided with a :'/4or 7/j, hole in the center for receiving a tenon
turned at the end of the workpiece.
Figure 61
Once made, such chucks are permanent useful fixtures for
turning balls, goblets, etc. In use, the wood stock for turning is
turned between centers to produce a tenon at one end which
will be a driving fit in the hole of the chuck. When mounted in
the chuck, the workpiece is substantially supported for any
faceplate type of turning.
Figure 62
TURNING CYLINDERS
Stock for cylinders should be mounted on the screw center or
a small faceplate. The tail stock can be brought up to support
the work while the circumference is being turned and finished.
Afterwards, the tail stock is backed off and the outer end of
the cylinder is recessed, using methods already described for
making deep recesses.
After making a recess at least _/2of the way through the
workpiece, and finishing this on the inside, remove the
workpiece from the lathe.
Now mount a short length of softwood stock on the screw
center and turn this down to form a dowel that will be a tight
press (not driving) fit inside the recessed end of the cylinder.
Mount the cylinder on this wooden chuck, and recess the
unworked end deep enough to form a perfect hole through
the entire cylinder.
I J
Figure 63
RECHUCKING
Rechucking is the general term used to describe any addition-
al work mounting that is necessary to complete a turning pro-
ject. The method of working cylinders, and the use of a plug
chuck as already described are typical examples. Another
good example is the rechucking of a bowl.
The work is mounted on a wood backing block secured to
the large faceplate and it is turned in the usual manner. All
surfaces are cut except the back side (which is against the
mounting block). The work is then removed from the
mounting block.
An auxiliary chuck of softwood is now made in the same
manner that the cylinder chuck is made. This chuck must
have a turned recess properly sized to accommodate the
rim of the bowl in a tight press fit.
When the bowl is mounted in this chuck, the bottom can
be cleaned off and slightly recessed to complete the
desired contours.
Figure 64
TURNING A RING
One method of turning a ring requires a spindle chuck.
The work stock is first mounted to a backing block held by
the large faceplate and is turned to shape on the outer
side. The inside diameter of the ring is also shaped - all
the way through to the backing block.
The work is then removed from the backing block.
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