Mechanical Model Kits
- Gear Driven
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
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
GEARED RECIPROCATOR DRIVE
4Z4-013
Type: Gear Drive
Drive illustrates conversion of rotational motion into variable-speed reciprocation
using gearing and slotted-link connection between crank-operated input shaft and
oscillating out-put motion. Indicators useful in studying speeds and phase relationships
involved. Price: $97.24
PLANETARY GEAR DRIVE
4Z4-014 Type:
Gear Drive
Drive illustrates principles of planetary gear systems. 108-tooth internal gear engages
30-tooth planetary gears, which mesh with 48-tooth gear on shaft concentric with input;
arm holds planetary gears. Arrangements for holding different members fixed. Illustrates
speed ratios, directional relationships and principles of construction in drives involving
gears on moving centers. Price: $188.19
CYCLOIDAL CRANK
4Z4-015 Type: Gear Drive
Drive illustrates conversion of a uniform rotation into a unidirectional,
variable-speed rotation. Arm drives planetary pinion riding inside stationary, internal
(sun) gear. Pin on planet pinion engages slotted link on output member, imparting variable
speed. Center distance between shafts variable. Useful in studying speed variation and
motion characteristics of a non-uniform motion drive. Price: $94.09
EPICYCLIC GEAR DRIVE
4Z4-017 Type: Gear Drive
Drive illustrates motion of a gear train consisting of a 60-tooth sun gear and arm
(input) carrying a 24-tooth planet gear riding externally on the sun gear. Planetary
(epicyclic) motion shown by following the path traced on a fixed end plate by a scribing
point attached to the planet gear. Useful in illustrating characteristics of an important
class of compound motions. Price: $57.51
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
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
HERRINGBONE-GEAR DRIVE
4Z4-038
Type: Gear Drive
Drive illustrates principle of motion transmission at constant speed ratio between
two parallel shafts using herringbone gears. Indicator on output shaft assists in studying
speeds and directions of rotation in a type of gearing used to minimize axial thrust power
drives. Price: $72.14
BEVEL GEAR FORWARD &
REVERSE MECHANISM 4Z4-048 Type: Gear Drive
Mechanism consists of a 48 tooth bevel gear which drives either of two 24 tooth bevel
gears mounted on the cross shaft. When the shift button is depressed, the drive is shifted
from one 24 tooth gear to the other, reversing the direction of rotation of the output
shaft. Indicators on the shafts facilitate the study of speeds and directions of rotation
involved. Price: $80.50
COMPACT TOOL KIT
4Z4-0ST
Five piece kit consisting of two screw drives and three wrenches. Price: $12.95
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