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��TEAM 3

MECHANICAL WALL CLOCK

SL NO	NAME	ROLL NO	USN
1	Akshay	206	01fe18bme014
2	Bhaskara B S	214	01fe18bme038
3	Sitaram bhat	215	01fe18bme039
4	Saikrishna vernekar	278	01fe17bme356
5	Adarsh s shet	280	01fe17bme358

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��BRIEF INTRODUCTION�

In the past we have come across many time keeping devices like
Sundials
Water Clock
Sand-glass
Candle Clock
Accuracy was a measure concern in the above clocks.
Around 14th century Mechanical Wall Clock with escapement mechanism were introduced.
These were more accurate than that of the clocks which relied on sun and sand.But the downfall of these clocks happened due to their weak power source.It lead to development of Quartz and Atomic clock.

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Energy source- The energy is stored in weight or spring.
Gears- an interconnected gear forms a train which transmits energy through the timekeeper. The energy source moves slowly and the wheel at the furthest moves quickly.
Escapement – This is connected to a quickly moving end of the train . It allows only one teeth at a time. The ticking of the timekeeper is the sound of escapement stopping the wheel tooth.
Controller – it is connected to the escapement . It controls the rate at which it allows the teeth to pass . The common controller is a pendulum.
Indicator – This is the part of the timekeeper that tells us the time.

Inside a Mechanical Wall Clock

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How we measured

Scale
Vernier Calliper
Pitch Gauge
Compass

Complex Parts were measured by tracing them on paper and later modelled them.
Teeths on Gear were counted visually and subsequent calculation were made.
Gear Train was drawn using Compass.

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Sl no	parts	material	Measuring instrument	Material properties
Sl no	parts	material	Measuring instrument	Yield strength (MPa)	Elastic modulus (GPa)	Shear strength (MPa)	Poisson's ratio
1	Winding key	steel	Vernier calliper and scale	245	210	350	0.26
2	Gear_1	brass	Vernier calliper and scale	140	117	270	0.34
3	Gear_2	brass	Vernier calliper and scale	140	117	270	0.34
4	Gear_3	brass	Vernier calliper and scale	140	117	270	0.34
5	Gear_4	brass	Vernier calliper and scale	140	117	270	0.34
6	Gear_5	brass	Vernier calliper and scale	140	117	270	0.34
7	Gear_6	brass	Vernier calliper and scale	140	117	270	0.34
8	Gear_7	brass	Vernier calliper and scale	140	117	270	0.34

Bill of Materials

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Sl no	part	material	Measuring instrument	Material properties
Sl no	part	material	Measuring instrument	Yield strength (MPa)	Elastic modulus (GPa)	Shear strength (MPa)	Poisson's ratio
9	Gear_8	brass	Vernier calliper and scale	140	117	270	0.34
10	Gear_9	brass	Vernier calliper and scale	140	117	270	0.34
11	Gear_10_p1	brass	Vernier calliper and scale	140	117	270	0.34
12	Gear_10_p2	brass	Vernier calliper and scale	140	117	270	0.34
13	Gear_10_p3	brass	Vernier calliper and scale	140	117	270	0.34
14	Gear_11	brass	Vernier calliper and scale	140	117	270	0.34
15	Base	wood	Vernier calliper and scale	8.6	12.56	12.3	0.036
16	Top	wood	Vernier calliper and scale	8.6	12.56	12.3	0.036
17	Minute hand	steel	Vernier calliper and scale	245	210	350	0.26
18	Hour hand	steel	Vernier calliper and scale	245	210	350	0.26

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Sl no	part	material	Measuring tools	Material properties
Sl no	part	material	Measuring tools	Yield strength (MPa)	Elastic modulus (GPa)	Shear strength (MPa)	Poisson's ratio
19	Clock housing p1	wood	Vernier calliper and scale	8.6	12.56	12.3	0.036
20	Clock housing p2	wood	Vernier calliper and scale	8.6	12.56	12.3	0.036
21	Clock housing p3	wood	Vernier calliper and scale	8.6	12.56	12.3	0.036
22	Clock housing p4	wood	Vernier calliper and scale	8.6	12.56	12.3	0.036
23	Fly p1 and p2	brass	Vernier calliper and scale	140	117	270	0.34
24	Striker	steel	Vernier calliper and scale	245	210	350	0.26
25	Time lock	steel	Vernier calliper and scale	245	210	350	0.26
26	Align	steel	Vernier calliper and scale	245	210	350	0.26
27	Film	steel	Vernier calliper and scale	245	210	350	0.26
28	anchor	Brass	Vernier calliper and scale	140	117	270	0.34

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Hand Sketching of parts

Striker Gear Train

Main Gear Train

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Pendulum

Hour and Minute Hand

Frame

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3D Models vs Actual parts

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