Jet BDB-919, Operating Instructions And Parts Manual

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6.0 Setup and preparation
for operation
To avoid twisting the bed, make sure the location to
which the lathe will be moved is absolutely flat and
level. Place a machinist’s level on the bed ways and
check for level side-to-side and front to rear. If stand
mounted, the stand must be fastened to the floor. (An
optional JET stand is available for the lathe BDB-
919, order stock no. 321375)
Remove rust protectant from all surfaces with a soft
rag and kerosene, diesel oil, or a mild solvent. Do not
use gasoline, paint thinner, or lacquer thinner, as
these may damage painted surfaces. After cleaning,
wipe with a clean, dry cloth and cover all machined
surfaces with a light film of machine oil.
Carefully read the grounding instructions on pages 2
and 3. It is recommended that the BDB-919 and
BDB-929 Lathes be connected to a dedicated,
minimum
25 amp circuit with a circuit breaker or time
delay fuse. Local codes take precedence over
recommendations.
7.0 General description
7.1 Lathe bed
The Lathe bed is made of high-grade iron. By
combining high cheeks with strong cross ribs, a bed
of low vibration and rigidity is produced. The main
motor is mounted to the rear of the bed (Figure 2).
7.2 Headstock
The headstock (Figure 3) is cast from high grade, low
vibration cast iron. It is bolted to the bed with four
screws and uses four adjusting screws for alignment.
In the head the large main spindle is mounted on two
precision taper roller bearings. The hollow spindle is
a Morse taper No.3 with a 3/4” bore
A quick change of the belt can be accomplished by
easing the tension on the idler (Figure 4).
To protect the machine against accidental damage,
a clutch is fitted to the reduction pulley at the 130
R.P.M. speed.
Figure 2
Figure 3
Figure 4