Mechanical Model Kits
The proven way to grasp even the most
complex mechanical motion principles.
 INCLINED-PLANE DRIVE
4Z4-026 Type: Combined Drive
Drive illustrates conversion of translatory motion into perpendicular translatory
motion by means of an inclined plane or wedge. Geared, crank-operated drive shaft actuated
wedge mounted on horizontal dovetail slide. Wedge engages rollers on output member moving
on vertical dovetail slide at reduced speed depending on wedge angle. Linear scale on
output motion useful in studying speed relationships involved. Price: $99.31
 CAM-FOLLOWER MECHANISM
4Z4-027 Type:
Cam Mechanism
Drive illustrates conversion of rotary motion into reciprocating motion and into
oscillation by cam action. Crank-operated drive shaft attached to plate cam engages (a)
translating, roller follower traveling on dovetail slide (b) swinging follower. Return
springs ensure continuous contact. Basic principles of cam action illustrated in this
unit. Price: $51.24
 CYLINDRICAL CAM MECHANISM
4Z4-028
Type: Cam Mechanism
Drive illustrates conversion of rotation into oscillation at right angles.
Crank-operated drive shaft carries cylindrical cam bearing against roller follower on
oscillating output member. Return spring ensures contact. Drive illustrates kinematics of
a basic three-dimensional cam drive. Price: $87.82
 BARREL-CAM DRIVE
4Z4-029 Type: Cam Mechanism
Drive illustrates conversion of rotation into oscillation at right angles. Unit has
cylindrical (barrel) cam with groove providing double contact with roller on swinging
follower member. Arrangement illustrates positive constraint of forward and return motion
without the use of a return spring. Price: $75.26
 CRANK-AND-SLOT
DRIVE
4Z4-030 Type: Lever Mechanism
Drive illustrates conversion of continuous rotation into continuous rotation with a
varying speed ratio. Pin on drive crank engaged eccentric, slotted link, impairing
variable speed. Eccentricity is adjustable. Indicator on output shaft assists in studying
speed variation and effect of eccentricity on motion of drive. Price: $38.68
 TRIPLE-STAGE
GEAR TRAIN
4Z4-031
Type: Gear Drive
Drive illustrates motion transmission in a three-mesh, four axis gear train
(96/24x72/36x90/30). Indicators on the four shafts illustrate speeds, phasing and
directions of rotation gear transmissions. Price: $104.54
 FOUR-STAGE CHANGE-GEAR ASSEMBLY
4Z4-032
Type: Gear Drive
Drive illustrates principle of angular-speed variation using change gears. Drive shaft
connected by a sliding clutch to any one of a set of change gears connected to output
shaft, thus providing a choice of speed ratios. Useful in understanding design principles
and kinematics of transmissions, such as are found in machine tools and vehicle drives.
Price: $229.79
 OPEN-BELT DRIVE
4Z4-033 Type: Traction Drive
Drive illustrates principle of belt drives used for uniform motion transmission between
parallel shafts. Crank-operated drive shaft has pulley driving belt passing over pulley on
output shaft. Indicator on output shaft useful in studying speeds and directions of
rotation in a basic friction drive. Price: $55.42
 TANDEM-BELT DRIVE
4Z4-034 Type: Traction Gear
Unit illustrates design of open belt drives in tandem. Crank-operated drive shaft with
driving pulley engages belt running over pulley on intermediate shaft. Second pulley on
intermediate shaft drives output shaft through another belt. Indicators on the three
shafts useful in studying speeds, phasing and directions of rotations involved. Price:
$62.72
 HELICAL-GEAR
DRIVE
4Z4-035 Type: Gear Drive
Drive illustrates principle of single helical gear mesh (36/48) for coupling two
parallel shafts with a constant speed ratio. Indicator on output shaft assists in studying
speeds and directions of rotation involved. Price: $48.09
 CROSSED HELICAL-GEAR DRIVE
4Z4-036
Type: Gear Drive
Drive illustrates principle of motion transmission at constant speed ratio between two
non-intersecting shafts at right angles, using helical gears (48/36). Indicator on output
shaft useful in studying speeds and directions of rotation in a commonly used instrument
drive. Price: $54.36
 DOUBLE-STAGE CROSSED HELICAL-GEAR DRIVE
4Z4-037
Type: Gear Drive
Drive illustrates motion transmission at constant speed ratios involving more than two
shafts using crossed helical gears. Crank-operated drive shaft coupled to parallel output
shaft by intermediate gear mounted on a shaft at right angles. Indicators on intermediate
and output shaft useful in studying speeds, phase, and directional relationships involved.
Price: $70.03
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