4.Concept Generation

3.1 Weights to the Objectives

Objective	Weights
Safety	9
Ease of Use	7
Portability	5
Use of Standard	6
Cost	6

3.2 Pugh Chart for the 4 Alternative Design

Design Objective	Weights	Design 1	Design 2	Design 3	Design 4
Aesthetics	5	+	Datum	+	-
Cost	4	-	Datum	0	-
Installation	3	++	Datum	+	0
Safety	6	0	Datum	0	+
Ease of Use	8	--	Datum	++	-
Maintenance	2	0	Datum	+	+
Space	7	-	Datum	-	-
Score(+)		11		26	2
Score(-)		-34		-7	-35
Total		-23		19	-33

3.3 Justifications For The Scores Given

Design No.	Objective	Score Allocated	Justification for the Score
	Aesthetics	5	Compact and modern appearance due to dual spinning wheels launching mechanism
	Cost	4	It includes gears , wheels, pneumatic energy source making it little costly.
	Installation	3	It includes basic component's making its installation process simple but with proper alignment
1	Safety	6	Automatic spinning wheels and controlled servo motor provides operational safety.
	Ease of Use	8	Once the balls are filled in the hopper they are automatically launched by the spinning wheels
	Maintenance	2	Moving wheels, gears and servo mechanisms require periodic inspection and maintenance.
	Space	7	All the items are compactly arranged with less space occupied.
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	Aesthetics	5	Simple and unique appearance with straightforward launching machine.
	Cost	4	It has a adjustable tripod stand ,linear arm, electric motor making costlier.
	Installation	3	Tripod stand and linear mechanism require proper alignment.
2	Safety	6	The controlled plunger and servo latch provide better control.
	Ease of Use	8	Once the balls are filled in the stack the servo motor sets the pace and the DC motor automatically launches
	Maintenance	2	The tightening hinge , adjustable tripod stand and the servo motor require proper maintenance
	Space	7	Adjustable tripod provides a compact and portable support structure.
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	Aesthetics	5	Mechanical catapult and rotating-disc arrangement gives the design a classy look.
	Cost	4	Rotating disc , mechanical catapult and portability feature make it expensive.
	Installation	3	Catapult, rotating disc and gear-track system require careful assembly and alignment.
3	Safety	6	Electric air valve and controlled firing mechanism help provide controlled operation.
	Ease of Use	8	Run by the DC motors and launched by the catapult , manual operation is less making it easy to use.
	Maintenance	2	Catapult joints, rotating disc and gears need periodic maintenance.
	Space	7	Moving wheels provide mobility but catapult requires space to operate.
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	Aesthetics	5	Modern and compact design with hopper and rotating arm.
	Cost	4	Uses motors, gears, wheels and servo components, making it moderately costly.
	Installation	3	Requires proper alignment of the spinning wheels, hopper and gear-track mechanism.
4	Safety	6	Controlled ball feeding and firing by servo motor improves the safety.
	Ease of Use	8	Electric DC motor automates the launching process and rotating arm sets the trajectory making it easy to use
	Maintenance	2	Rotating arm and screw adjustment angles require periodic maintenance.
	Space	7	The wheel-based arrangement is relatively compact and can be moved easily when required.
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