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4
General
Specifications
Model
Motor
Table size
Table slot
Table tilt
Dimensions
Net weight
Shipping weight
Specifications
J-4421
3 HP, TEFC, 1725 RPM, 220/440 3-Phase
27 1/2 in. x 10 1/2 in. (68.75cm x 26.25cm)
3/8 in. x 3/4 in. (9.3mm x 19mm)
45 degrees downward
15 degrees upward
30 x 27 1/2 x 53 in. (75 x 68.75 x 132.5cm)
397 lbs. (180kg)
529 lbs. (240kg)
Figure 1: Model J-4421-2 20 Inch Grinder
The JET Model J-4421 20 inch diameter disc
grinder is a high production, rapid stock removal tool.
The stock removal rate is controlled by the amount of
pressure the operator applies to the work piece and the
grit of the abrasive sheet mounted on the drive disc. By
using different grit values and materials, a wide range of
materials can be ground and an equally wide range of
surface finishes achieved.
Because the Model J-4421 is a heavy duty design
throughout, large piece parts can be ground. The use of
either the miter system or the tilt table allows high
production grinding of angles. When used in combina-
tion, the miter/tilt design allows the grinding of compound
angles.
The table tilt mechanism is a rigid, precision worm-
and-sector gear controlled with a crank. Table angle is
shown on a protractor mechanism.
Table height with respect to the drive disc can be
adjusted using a rack and pinion gear system controlled
by a crank. The table assembly is counterbalanced to
make raising and lowering the table easier and to
increase the service life of the lifting components.
Model Number Stock Number
J-4421-2 577010
J-4421-4 577011
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