Jet BD-920N - Operating Procedures; Tool Setup and Manual Turning; Longitudinal Turning with Auto-Feed

Operation
Tool Set-Up
The cutting angle is correct when the cutting edge is in
line with the center axis of the work piece. The correct
height of the tool can be achieved by comparing the tool
point with the point of the center mounted in the tailstock.
The correct tool height can be obtained by using shims
under the tool. (Fig. 13)
When turning, the tool has a tendency to bend under
pressure. For best results, tool overhang should be kept
to a minimum of 3/8" or less.
Manual Turning
Apron travel, cross travel, and top slide handwheels can
be operated for longitudinal or cross feeding. (Fig. 14)
Fig. 14
Longitudinal Turning with Auto-Feed
Three automatic feeds are available. (Fast = 0.011 "/rev.,
medium = 0.007"/rev., slow = 0.005"/rev.) These can be
set by altering the gear wheel combinations (See table -
Fig. 15)
By moving lever (A, Fig. 16) upward, the automatic feed
is engaged.
% ■
-fK 4 0
a-J ^ 8 0
120-J 40
b-. r 1 27
Lever
9
1 9 1
a
28 28
45 45
b
60 60
60
60
Feed
.005 .007
.007
.011
Fig.15
8