LEMAN TAB120 Manuel D'utilisation page 61

11
WOODLATHE MANUAL
TOOL REST POSITION
Mount the tool rest in place about 1/8" away from the work and 1/8" above the work
centerline (Fig. 16.) This position may be varied to suit the work and the operator.
Place a guide mark on the tool rest shank as an aid to quick and accurate resetting.
Fig.17 Fig.18
ROUGHING A CYLINDER
The large gouge is used in the first turning operation by smoothing the sharp corners
of the work. Run the lathe at low speed and hold the gouge in the manner shown in
Fig. 17 The cut starts about 2 inches from the tailstock end and continues from this
point to the end of the tailstock. Make the second pass beginning about 2" or 3" to
the left of the first cut. Advance again toward the tailstock, and merge with the
previous cut. Toward the end of the live center, roll the gouge in the opposite
direction (Fig. 18) to carry the final cut off the live center end of the work. The
roughing cut should not be carried out with one continuous movement, because this
would tear long slivers from the corners of the work. Neither should the cut be started
directly at the end of the stock for the same reason. The cut can be safely carried
from the center of the stock toward and off either end once the first roughing cuts
have been made. The position of the gouge involves two or three important angles.
(1) The tool may be advanced along the work either from right to left or from left to
right. Left to right (from headstock to tailstock) is preferred since this action throws
chips clear of the operator. (2) The gouge is rolled over slightly in the same direction
it is advancing. (3) The tool is held well up on the work, with the bevel or grind
tangent to the revolving surface (Fig. 19). This position will give a clean shearing cut.
When pushed straight into the work (Fig. 19), the gouge has a scraping action,
(normally a poor practice in spindle turning). The roughing cut is continued until the
work approaches 1/8" of the required diameter. Once a cylindrical form has been
obtained, the turning speed can be moved to the second or third speed setting.
NOTE: Continue to move the tool rest inward toward the work piece to keep the safe
distance between the two.
EN