Full Product Manual

11
6.2 Extension cords
The use of extension cords is discouraged. Try to
position equipment near the power source. If an
extension cord becomes necessary, use only three-
wire extension cords that have three-prong
grounding type plugs and three-prong receptacles
that accept the tool's plug. Replace or repair
damaged or worn cord immediately.
Make sure your extension cord is good condition,
and is heavy enough to carry the current your
product will draw. An undersized cord will cause a
drop in line voltage resulting in loss of power and
overheating.
Table 2 shows the correct size to use depending on
cord length and nameplate ampere rating. If in
doubt, use the next heavier gage. The smaller the
gage number (AWG), the heavier the cord.
Ampere
Rating
Volts
Total length of
cord in feet
More
Than
Not
More
Than
120 25 50 100 150
AWG
0 6 18 16 16 14
6 10 18 16 14 12
10 12 16 16 14 12
12 16 14 12
Not
Recommended
Extension Cord Recommendations
Table 2
7.0 Operation
A bench grinder is designed for hand-grinding
operations such as sharpening chisels,
screwdrivers, drill bits, removing excess metal, and
smoothing and polishing metal surfaces.
The JBGM-6 and JBGM-8 with Multitool attachment
offer multiple working methods:
• Grinding wheel – A 36-grit wheel is provided,
and is effective when a considerable amount of
metal must be removed, or when obtaining a
smooth finish is not important. A finer grain
abrasive grinding wheel (not provided) can be
mounted for sharpening tools or grinding to
close size tolerances because it removes metal
more gradually for precision grinding and
achieves a smoother finish.
• Disc grinding – Versatile function, such as
dressing small castings and sharpening cutters
and tools, or squaring the ends of a workpiece.
An optional mitering table can be purchased
(see sect. 11.0) to support the workpiece and
facilitate angles.
• Belt and platen (horizontal or vertical position)
– Workpieces of any length can be worked on
the belt and platen.
• Contact wheel – Grinding, polishing and
sanding against belt and contact wheel offers
smooth sanding, removing material more
rapidly than conventional grinding wheels.
• “Free strapping” is grinding, sanding, or
polishing on the underside of belt, opposite the
platen, without a backing behind the belt. This
method is especially suitable for contour work.
Fine belt grades are recommended because of
the rapid material removal.
Always use approved safety
glasses or face shield while operating this tool.
Failure to comply may cause serious injury.
7.1 On/Off Switch
When grinder is turned off, the
wheel and belt may take a few moments to
completely stop.
Press rocker or toggle switch to start and stop
grinder.
Note: After extended operation, the grinder housing
may be warm to the touch. This is not abnormal.
7.2 Precautions
7.2.1 Wheel grinding
1. Before starting grinder, turn grinding wheel by
hand to verify that it is clear of obstruction and
turns freely. The tool rest and spark guard
should not touch the wheel.
2. Keep tool rest and spark guard to within 1/16"
of grinding wheel.
3. Turn on grinder and allow it to reach full running
speed before starting to grind.
4. Adjust the eye shield as needed.
5. Keep a steady, moderate pressure on the
workpiece and keep it moving at an even pace
for smooth grinding. Pressing too hard
overheats the motor and prematurely wears the
grinding wheel. Note the original bevel angle on
the item to be sharpened and try to maintain the
same shape. The grinding wheel should rotate
into the object being sharpened.
6. If grinding a narrow workpiece, slide it laterally
across width of wheel. Using full width of wheel
will help prevent a groove from forming at one
place on the wheel.
7. Keep a water pot filled with water and dip your
work into it regularly to prevent overheating.
Overheating can weaken metals. Do not apply
water directly to grinding wheel.
8. Do not use the side of the grinding wheel; this
puts dangerous stress on the wheel.