Jet JTM-1050VS2, Operating Instructions And Parts Manual

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11
11. Unwrap and clean elevating (knee) crank and
install it on its shaft. Secure it with washer and
socket cap screw preinstalled on shaft.
12. Install rubber way covers at front and behind
table.
7.5 Lubrication
Do not operate Mill before fully
lubricating it. Failure to comply may cause
damage to the machine.
Before operating mill, refer to sect. 11.2 for
lubricating instructions.
8.0 Electrical Connections
Electrical connections must
be made by a qualified electrician. This
machine must be properly grounded in
accordance with the National Electrical Code
and local codes and ordinances, to help
prevent electrical shock and possible fatal
injury.
The JTM-1050VS2 Mill is rated at 230/460V, 3-
phase and comes from the factory prewired at
230V. Confirm power at the site matches power
requirements of the Mill before connecting to power
source. The power source should be dedicated to
the Mill.
Remove junction box cover, and run main power
cable through box and attach the ground, followed
by power leads. Replace junction box cover.
Check for proper spindle rotation in the high speed
range . The spindle should rotate clockwise when
viewed from top of machine. If spindle rotates
counterclockwise, disconnect from power source,
and switch any two of the three power leads.
8.1 Voltage conversion
To change to 460V operation, remove junction box
cover on the motor, and change the wires
according to diagram found on inside of junction
box cover. A similar wiring diagram is found at the
back of this manual.
If discrepancies arise, diagram
on machine takes precedence.
8.2 Wire Sizes
For circuits which are far away
from the electrical service box, the wire size
must be increased in order to deliver ample
voltage to the motor.
To minimize power losses and to prevent motor
overheating and burnout, the use of wire sizes for
branch circuits or electrical extension cords
according to Table 2 is recommended.
Conductor
Length
AWG Number
230/460 Volt Lines
0 – 50 Ft. No. 14
50 – 100 Ft. No. 14
Over 100 Ft. No. 12
Table 2
9.0 Operation
9.1 Precautions

Do not attempt to change spindle RPM while
motor is stopped. Only change spindle speeds
while motor is running.

Verify that spindle brake is released before
starting motor.
 Rotate spindle by hand to facilitate meshing of
clutch and gears.
 Do not use quill automatic feed at spindle
speeds above 3000 RPM.
 It is recommended that the auto feed worm
gear be disengaged whenever auto feed is not
required. This will avoid unnecessary wear on
the worm gear.

Maximum auto feed loading is a 3/8” (9.5mm)
diameter bit for drilling in mild steel. Use
manual feed for bits larger than 3/8".

Overload clutch is factory set to hold up to 200
lbs. down feed pressure on the quill
(accommodates drills up to 3/8"). Do
not
attempt to adjust clutch pressure.