| Mechanical Model
Kits
The proven way to grasp even the most
complex mechanical motion principles.
 SINGLE MESH GEAR DRIVE
4Z4-001
Type: Gear Drive
Drive illustrates speed relationships in a single mesh, external, spur gear drive.
48-tooth gear on crank operated input shaft drives 96-tooth gear on output shaft with
indicator. Useful in studying speed ratios and control of direction of rotation obtainable
with gearing. Price: $63.83
 GEAR DRIVE WITH IDLER
4Z4-002
Type: Gear Drive
Drive illustrates speed relationships in a gear train with idler. 48-tooth gear on
input shaft drives 36-tooth gear (idler) on intermediate shaft, which meshes with 96-tooth
gear on output shaft. Illustrates function of idler in changing direction of rotation
without affecting output shaft speed. Price: $68.99
 DOUBLE-STAGE GEAR
DRIVE
4Z4-003
Type: Gear Drive
Drive indicates speed and directional relationships in a compound gear train:
dependence of speed ratio between input and output shafts on tooth ratios of both meshes
(93/36x54/48), while number of meshes determines direction of rotation (in this case both
shafts rotate in same direction). Price: $78.41
 WORM-GEAR DRIVE
4Z4-004 Type: Gear Drive
Drive illustrates motion transmission between two non-parallel, non-intersecting shafts
at right angles; speed relationships in a worm-gear drive (note high reductions); and
introduction to irreversible drives; crank and indicator on the two shafts assist in
studying speeds and direction of rotation. Price: $73.17
 BEVEL-GEAR DRIVE
4Z4-005 Type: Gear Drive
Drive illustrates motion transmission between non-parallel, intersecting shafts (in
this case at right angles), and speed relationships in a bevel-gear train. Crank and
indicator on the two shafts assist in studying speeds and directions of rotation. Price:
$73.17
 GENEVA
DRIVE
4Z4-006 Type: Shift Gears
Drive illustrates principles of an indexing motion. Crank-operated drive shafts engages
six-station, external geneva wheel, motion of which is intermittent (1/6 turn advance
followed by dwell). Illustrates speed variation and constructional characteristics of an
intermittent-motion drive. Price: $66.06
 CHAIN DRIVE
4Z4-007 Type: Traction Drives
Drive illustrates principle of positive-motion transmission between parallel shafts
using chains. Sprocket on crank-operated drive shaft actuates roller chain passing over
intermediate (idler) sprocket and engaging sprocket on driven shaft (with indicator).
Useful in showing speeds and directional relationships in chain drives. Price: $75.26
 FLAT-BELT DRIVE
4Z4-008 Type: Traction Drives
Drive illustrates principles of motion transmission over belts. Introduction to
friction drives. Crank-operated drive shaft with pulley drives belt running over
intermediate (idler) pulley and pulley on driven shaft with indicator. Useful in
illustrating speed and directional relationships in belt drives. Price: $57.51
 OLDHAM COUPLING
DRIVE
4Z4-009
Type: Clutches
Drive illustrates motion transmission requiring coupling of two, offset, parallel
shafts running at the same speed. In the Oldham coupling, perpendicular projections or
keys on the two shafts engage correspondingly shaped perpendicular slots or keyways on
floating, intermediate member. Motion of intermediate member adjusts to accommodate shaft
offsets. Price: $43.89
 STEPPED-BELT DRIVE
4Z4-010 Type: Traction Drives
Drive illustrates principle of variable-speed transmissions using belt drives. Drive
shaft and driven shaft contain five pulleys each; center distance is adjustable. Different
reduction ratios obtainable by running belt over different pulley combinations. Unit
useful in studying speeds and constructional requirements in variable speed drives. Price:
$78.41
 RACK-AND-GEAR DRIVE
4Z4-011 Type: Gear Drive
Drive illustrates conversion of a rotation into a proportional translation with limited
travel. Gear sector on crank-operated drive shaft engages rack mounted on dovetail slide.
Drive shows dependence of speed relationships on geometry of drive. Price: $56.45
 CRANK-AND-ROCKER
DRIVE
4Z4-012 Type: Lever Mechanism
Drive illustrates conversion of rotation into oscillation using a four-bar linkage.
Crank-operated driving shaft and driven shaft (with indicator) coupled by floating link,
length of which is adjustable. Center distance between shafts also adjustable. Useful in
studying speed relationships and effect of dimensional changes on motion characteristics
of a non-uniform motion drive. Price: $43.89
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