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YoYo Deliverable 4
A Waffle Lot
Lab D1
R912
Anjali Krishnamachar
Grace Li
Kira Schott
Lutong Tracy Cheng
Wen Zeng
Waffle
We chose a rational subgroup of 5 because this gave us a smooth moving average of
performance. The step change induced by the parameter change cannot be detected. The
parameter change of 100 psi in pressure was not enough to produce a significant change in
dimensions.
Process capability
C p = Range/6σ = .83
Plate
We chose a rational subgroup of 5 because this gave us a smooth moving average of
performance. The step change induced by the parameter change cannot be detected. The
parameter change was not enough to produce a significant change in dimensions.
Process capability
C p = Range/6σ = .862
Butter
We chose a rational subgroup of 5 because this gave us a smooth moving average of
performance. The step change induced by the parameter change cannot be detected. The
temperature drop wasn’t large enough to induce a change in the butter height.
Process capability
C p = Range/6σ = .73
Histogram of the string gap width with the upper and lower design specification limits
Cost Estimate
Labor cost estimates:
Waffle injection molding 1.5 hours
Plate injection molding 2 hours
Butter thermoforming and cutting 2.5 hours
Assembly 1.5 hours (4 people)
We’re assuming minimum wage is $7.25/hr.
Material cost estimates:
Polystyrene is 4 cents/lb. Polypropylene is 80 cents/lb.
Assumed machining time is $60/hour, taking into account power and facility usage.
Note: Mold machining time and material not included in this cost estimate.
Cost Estimate for 100 Yoyos
Part
Waffle
Plate
Butter
Assembly
Labor Cost
$10.88
$14.50
$18.13
$43.50
Material Cost
$3.20
$2.00
$0.04
$0
Machine Cost
$90
$120
$150
$0
Total
$104.08
$136.50
$168.17
$43.50
Overall total cost estimate for 100: $452.25
Cost Estimate for 100,000 Yoyos
Part
Waffle
Plate
Butter
Assembly
Labor Cost
$10880
$14500
$18130
$43500
Material Cost
$3200
$2000
$40
$0
Machine Cost
$90000
$120000
$150000
$0
Total
$104080
$136500
$168170
$43500
Overall total cost estimate for 100,000: $452250
Estimated production cost vs. volume
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