PUGH CHART.

Objectives	Weights
Safety	8
Ease of use	6
Portability	7
Use of standard parts	5
Cost	4
Cleaning efficiency	8

Design Objectives	Weights design 1	design 2	design 3	design 4
Safety	8	+	++	datum
Ease of use	7	+	+	datum
Portability	3	-	-	datum
Use of standard parts	5	0	0	datum
Cost	4	-	+	datum
Cleaning Efficiency	8	+	++	datum
Score(+)	23	43	0	23
Score(-)	7	3	0	3
Total	35	15	40	0

Justification Score

Design No.	Objective	Score Allocated	Justification for the Score
	Safety	8	safety is the most imp. thing while using any device
	Ease of Use	7	if it is not easy to use then there is no use of making this bot
1	Portability	-3	it is imp. but requires time to shift
	Use of Standard Parts	0	so that it my be easy for the product will take less time to be built
	Cost	-4	the manufacturer will manufacture the product within the range of the consumer
	Cleaning Efficiency	8	good when compared to the datum
2	Safety	16	it is more safer when compared with other design options
	Ease of Use	7	easier than the datum
	Portability	-3	less portable when compared to the datum
	Use of Standard Parts	0	all the products are built by usage of parts available in the market
	Cost	4	slightly increases when compared with the datum
	Cleaning Efficiency	16	Best one when compared to all the designs
3	Safety	0	it is safe, but not as much as the other
	Ease of Use	0	needs some extra manual efforts
	Portability	0	it is the most portable one when compared to all the other selected designs
	Use of Standard Parts	0	all the products are built by usage of parts available in the market
	Cost	0	it is one among the lowest ranging design
	Cleaning efficiency	0	does not clean the corners of the board
4	Safety	8	it is as safe as the first one
	Ease of Use	7	easier than the datum
	Portability	-3	less portable when compared to the datum
	Use of Standard Parts	0	all the products are built by usage of parts available in the market
	Cost	0	it is one among the lowest ranging design
	Cleaning efficiency	8	good when compared to the datum

Selected Design

Cleaning unit consists of rack and pinion, brush, whiteboard, supportive board etc. Rack and pinion mechanism consists of a circular pinion of a diameter of 1.5 inches and long rectangular rack of a length of 18 inches. The pinion is coupled with the motor that means the pinion rotates with the shaft of the motor. The rotary motion of the motor is transferred to the rack & the rack moves in translatory direction. The brush is an important part for this project. To clean the white board smoothly a brush of better quality has been used. It has attached to the brush holder with the help of glue & the brush holder is attached to the end of the rack with a nut & bolt. Foam has been used as the cleaner. A sheet of 10 inches × 6 inches size has been used as a white board. The whiteboard is enclosed within two reels. A wooden block is used as a supporting base for the whole system and is made up of plywood. It is of length 50cm, breadth 5cm and height 40cm. It is used to support the whiteboard sheet at the time of writing. The motor and rack & pinion mechanisms are also fitted on wooden block. The reels are fixed with this supportive board by the help of angle plate.

FUNTION CLUSTERING

SUBSYSTEM LIST

SL.NO.	SUBSYSTEM LIST
1	Indication Unit
2	Controlling Unit
3	Sensing Unit
4	Cleaning Unit

INTERACTION DETAILS

SUBSYSTEM 1	Subsystem 2	Subsystem 3	Subsystem 4
SPATIAL	Yes	No	No
DATA	No	No	No
MATERIAL	No	Yes	Yes

SUBSYSTEM 2	Subsystem 1	Subsystem 3	Subsystem 4
SPATIAL	Yes	No	No
DATA	No	Yes	Yes
MATERIAL	No	No	No

SUBSYSTEM 3	Subsystem 1	Subsystem 2	Subsystem 4
SPATIAL	No	No	No
DATA	No	Yes	Yes
MATERIAL	Yes	No	No

SUBSYSTEM 4	Subsystem 1	Subsystem 2	Subsystem 3
SPATIAL	No	No	No
DATA	No	Yes	Yes
MATERIAL	yes	No	No