Jet BD-920N - Taper Turning Techniques; Turning Between Centers

Taper Turning Using Tailstock Off-Set
Work to a side angle of 5° can be turned by off-setting
the tailstock. The angle depends on the length of the
workpiece. (Fig. 17)
To off-set the tailstock, loosen locking screw (1, Fig. 17).
Loosen the front adjusting screw (2) and take up the
same amount by tightening the rear adjusting screw (3)
until the desired taper has been reached. Tighten the
front screw to lock the tailstock in position. The
workpiece must be held between to centers and driven
by a face plate and driver dog
After taper turning, the tailstock should be returned to it's
original position. The zero position of the tailstock is
checked by turning a test piece with constant adjustment
until the piece is absolutely true.
Taper Turning by Setting the Top Slide
By angling the top slide, tapers may be turned (Fig 18)
To rotate the top slide:
Loosen two screws (1, Fig. 18), top slide can then be
rotated. A graduated scale permits accurate adjustment
of the top slide. This method can only be used for short
tapers.
Turning Between Centers
For turning between centers, it is necessary to remove
the chuck from the spindle. Fit the MT-3 center into the
spindle nose and the MT-2 center into the tailstock.
Mount the workpiece fitted with the driver dog between
the centers. The driver is driven by a catch plate or face
plate. (Fig. 19)
Note: Always use a small amount of grease on the
tailstock center to prevent center tip from overheating
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