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7
Machine set-up
Grinder set-up
1. Uncrate the grinder and remove it from its shipping skid.
2. Remove the table raiser crank which is taped to the
grinder and install the crank on the raiser shaft, securing it
with the set screw in the crank.
3. Spot and anchor the grinder according to instructions in
the next section.
4. Remove the grinding disc (which is in a protective
sleeve) from the machine.
5. Clean the protective coating on the machine surfaces
with mineral spirits or other type of non-flammable cleaning
fluid.
6. Clean the surface of the drive disc using a film-free
cleaner such as naptha.
7. Remove the grinding disc from its protective sleeve and
install it on the drive disc according to instructions in
Remove and replacing grinding discs, page 10.
8. Tilt the table to level using the protractor on the table,
then raise the table assembly until it is more-or-less in the
middle of the drive disc.
9. Check table for level according to instructions following in
this section.
10. Establish power to the grinder using instructions in
Electrical which follow in this section.
11. Grinder may be released for service.
Figure 1: Base hold-down diagram
Spotting and anchoring the
sander
1. Set 3/8 inch floor anchors in the pattern indicated in
Figure 1.
2. Set the grinder on its anchors.
3. Level the table using the protractor on the table.
4. Put a machinist's level on the table.
5. Use the two leveling bolts on the rear of the base to level
the grinder. Shim under the anchor positions as needed to
level the grinder.
6. Secure the grinder to the floor using the anchors.
Checking table level
While the machine has been run at the factory and
checked before shipment, you may want to check the table
level before releasing the grinder for service.
1. Disconnect the grinder from its electrical power source
to prevent accidental start-up (if you have already connected
it to power.)
2. Unlock the table tilt lock handle.
3. Place a machinist's square against the table and disc
face.
4. Using the table tilt adjustment handle, adjust the table
until it is at a right angle to the disc face.
5. Check the protractor pointer. It should be on the ZERO
degree mark of the protractor. If not, adjust the pointer by
loosening its attachment screw and moving it to the ZERO
mark, then retighten the screw.
Figure 2:
Service
wiring
diagram
Electrical
The Model J-4421 has a 220/440 Volt, 3-phase
motor. It is shipped wired to the specifications on the
customer order.
The machine uses a LVP or "low voltage protection"
ON/OFF switch which trips to the OFF position when
voltage drops below a pre-determined safe level. This
feature protects the operator from a quick re-start when
service voltage cuts out or varies excessively. After
tripping, the LVP switch must be positively reset by the
operator before the motor receives power, again.
The LVP switch has a coil inside its case which is
designed to work with a specific voltage level. If you
decide to change the voltage source to the grinder from
220 to 440 (or the reverse) this coil must be replaced (in
addition to changing the motor's internal wiring connec-
tions.)
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