Jet JTM-1, Operating Instructions And Parts Manual

Page: 11 / 36

11
11. Unwrap and clean elevating (knee) crank and
install it on its shaft.
12. Install rubber way covers at front and behind
table.
13. Install belt guards.
8.6 Lubrication
Do not operate this milling
machine before fully lubricating it. Failure to
comply may damage machine.
Familiarize yourself with all lubricating points in
section 13.0, and fully lubricate this machine before
operating it.
9.0 Electrical connections
All electrical connections
must be made by a qualified electrician in
compliance with all relevant codes. This
machine must be properly grounded. Failure to
comply may result in serious injury.
Confirm that power at the site matches power
requirements of the mill before connecting to power
source.
The JTM-1 turret mill is rated at 2HP, 3PH, 230V
only.
The JTM-2 turret mill is rated at 2HP, 1PH,
115/230V and comes from the factory
prewired at
230V.
To convert from 230V to 115V operation (JTM-2
only):
1. Open junction box on motor and change the
wires according to diagram found on inside of
cover.
2. Open Fwd/Rev switch box and change
connections according to diagram.
Similar diagrams are found in section 16.0 of this
manual. Note: If discrepancies arise, diagrams on
machine take precedence.
It is recommended that the JTM-1 be connected to
a dedicated 10 amp circuit with a circuit breaker or
time-delay fuse. Connect the JTM-2, using
230
volt power , to a dedicated 40 amp circuit with
circuit breaker or time-delay fuse, and the JTM-2
with
115 volt power, to a dedicated 30 amp circuit
with circuit breaker or time-delay fuse. Local
codes take precedence over recommendations.
9.1 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 the following table is
recommended:
Conductor
Length
AWG Number
230/460 Volt Lines 120 Volt Lines
0 – 50 Ft. No. 14 No. 14
50 – 100 Ft. No. 14 No. 12
Over 100 Ft. No. 12 No. 8
Table 1
10.0 Controls
Refer to Figure 5:
Figure 5: controls
A. Motor Lock (Belt Tension) Levers (A, Figure
5) – Slide levers to loosen motor mounting;
shift motor to release tension on belts and
reposition belts for different speed range.
Disconnect mill from
power source before changing belt
position. Reinstall belt guards before
operating mill.
B. Speed Range Selector (B) – Mill is in high
speed range when selector is in front position
(facing operator). Push selector to the side to
shift into low speed range. Rotate spindle to
assist engagement, by either turning spindle
nose by hand or turning drawbar knob with a
wrench, provided drawbar is pulled up tightly.