Description of the product
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| Antoine Guivarch guivarch@mit.edu Taesik Lee tslee@mit.edu Carissa Tudryn tudi@mit.edu 2.875 Mechanical Assembly and its Role in Product Development Dr. Daniel Whitney Project Assignment #1 Quartz Analog Alarm Clock Description of the product  Table of contentsAssembly drawing p.3 Exploded view p.4Bill of Materials p.5Description of each part p.6 List of mates p.8Drawings & pictures of parts and p.10 subassemblies We purchased a battery-operated quartz analog alarm-clock for $13 at the Coop. It is manufactured by Westclox in China (that is what the back casing says). The instruction manual mentions the following address in the United States, as well as a fax number in the same state: General Time Service Center 120 Newton Bridge Road Athens, Georgia, USA 30607-1163. We disassembled the clock into several different parts listed below in the order of disassembly. We had to break two wires connecting a coil to a printed circuit board (PCB1), but nothing else was broken, so that we were able to reassemble the clock entirely. The smaller parts (gears) were marked with a pen so as to remember where they go and which side up. 3 casing screws Battery cover (dark gray plastic) Back casing (dark gray plastic) Top alarm button (shiny gray plastic) On/off alarm button (gray plastic) Setting knob (black plastic) Clock cover (transparent plastic – clipped) 2 thinner screws attaching the spring slide to the gear box subsystem Spring slide (black), linked by a wire 2 shorter screws attaching the bell subsystem Bell subsystem (metal, black plastic, motor), linked by two wires Second hand (shiny gray) Minute hand (black with fluorescent sticker) Hour hand (black with fluorescent sticker) Alarm hand (gray) Gear box subsystem (see below) 1 gray flex cable linking the gear box subsystem to a small circuit board Small circuit board (PCB 2) (just for connecting wires – soldering) Gear box subsystemGear box cover (clipped, with sliding switch on top) 1 gear T with metal axis and three slots (T for top, inscription on top) 1 gear (white) FL (far left if coil to the right, inscription on top) 1 gray gear L (left if coil to the right, inscription on top) 1 tiny gear B (bottom, under the coil) (+ black ring inside) 1 gray front casing 1 coil stand (black with metal contact, lifted and pulled out) 1 Coil on metal frame (two wires out of the coil to the circuit board, pushed out of its stand) 1 White peg (to be in connection with the setting knob) 1 gear “movie real” IT (inside top) on 1 gear off axis I2T (inside 2nd top) 1 transparent peg on 1 black stand 1 circuit board (PCB1 for Printed Circuit Board 1) (1 resistor, 1 transistor, 2 capacitors, 1 metal thing, must be the quartz) 1 white roller I3T on top 1 gear I4T with little peg 1 gear I5T popped out of the gear box base 1 gear box base Bell sub-systemDouble-ring bell ringer Motor plus capacitor Bell on black plastic stand Exploded View on next page  BILL OF MATERIALS 5 subsystems, 32 parts Front Casing Subsystem FC 10 parts Front casing FC1 Clock paper FC2 Battery + contact FC3 Battery – contact FC4 LED FC5 Transparent clock cover FC6 Alarm hand FC7 Hour hand FC8 Minute hand FC9 Second hand FC10 SPRING SLIDE SS 7 parts Base SS1 Slide SS2 Spring SS3 Electric contact holder SS4 Electric contact bumper SS5 Metal contacts SS6 (comes with SS5) & SS7 BELL SUBSYSTEM BSS 6 parts Support BSS1 Motor BSS2 Ring holder BSS3 Rings (2x, no difference) BSS4 Bell BSS5 Capacitor BSS6 GEAR BOX GB 4 parts Gear box GB1 Gear box switch GB2 Printed Circuit Board GB3 Flex cable GB4 BACK CASING SUBSYSTEM BC 5 parts Back casing BC1 Battery cover BC2 Alarm button BC3 On / off switch BC4 Knob setter BC5 Not counted: wires screws
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