Jet JTM-1254RVS, Operating Instructions Manual

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9. When machine is over its anchors, level
machine using the bolts at the corners of base.
Also use shims if needed. The machinist’s level
used for leveling should be placed on the table.
The table is the reference surface for both side-
to-side and fore-and-aft leveling. Be certain you
get it level in BOTH directions.
Mill must be supported
equally under all four corners. Failure to
comply may cause column to twist and put
a bind in the table ways.
10. When machine is level, secure base to anchor
system.
IMPORTANT: Before attempting to raise mill head,
refer to section 9.1 for procedures to safely raise
and set up the mill head.
11. Loosen the four hex head nuts (see A, Figure 9-
1) about 1/4 turn each (counterclockwise), just
enough to allow rotation of head.
12. While assisting the worm mechanism by putting
upward pressure on the motor by hand, use the
supplied wrench to turn worm nut and raise
head to upright position.
13. Tighten the head bolts slightly — not torqued —
just snug.
14. Using mineral spirits or other cleaning solvent,
clean all of the rust proofing from where it may
have been applied. This is important; moving
the table or any other components before
removing the rust proofing will only put rust
proofing where you don’t want it.
Some of the following steps may have already been
performed on the machine. If so, ignore the
instructions related to those particular steps.
Otherwise, perform them in the order listed. Refer to
Figure 4-2 to help locate items.
15. Install table longitudinal and cross-feed cranks
on their respective shafts using the nuts on the
shafts to secure the cranks.
16. Remove any rust proofing from drawbar and its
spacer, and put drawbar with spacer installed
into spindle center through top of machine.
17. Slide fine feed handwheel onto handwheel hub
and push until its roll pin engages hole in hub
and handwheel is flush with hub surface.
18. Install coarse feed handle on feed shaft and tap
it lightly until its roll pin engages hole in hub and
it is flush against hub surface.
19. Unwrap and clean knee crank and install it on
its shaft.
20. Install rubber way covers at front and behind
table.
6.0 Electrical connections
All electrical connections must
be made by a qualified electrician! Failure to
comply may cause serious injury!
6.1 General electrical cautions
This machine must be grounded in accordance with
the National Electrical Code and local codes and
ordinances. This work should be done by a qualified
electrician. The machine must be grounded to
protect the user from electrical shock.
NOTE: The machine’s electrical box has a switch
interface. Door will not open if main switch is ON.
6.2 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 the following table 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 1
Confirm that power at the site matches power
requirements of the mill before connecting to the
power source.
6.3 Voltage conversion
The JTM-1254VS and JTM-1254RVS have been
pre-wired for 230 volt operation. To change from
230 to 460 volt operation:
1. Remove junction box cover on motor and
change wires according to diagram found on
inside cover (also shown in Figure 6-1).
Note: In case of discrepancy, diagrams on
machine take precedence.
Figure 6-1