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US 5,731,572 AGranted
Six sigma calculator
AssigneeHughes Electronics Corporation
InventorKirk T. Winn
Life of this patent
Estimating the term…
Abstract
A slide rule permits rapid calculations of parameters used in the Six Sigma quality analysis program. For a given number of defects per product and a known number of parts per product (opportunities), the device permits rapid calculation of the number of defects per million opportunities as well as various statistical relationships, with a single movement of the slide.
Claims19
A slide rule for Six Sigma calculations, comprising:
- a stationary scale display section;
- a sliding scale display section that slides relative to said stationary section;
- a Defects per Unit (DPU) scale displayed on one of said sections;
- an Opportunity Count (OpCount) scale displayed on the other of said sections in alignment with said DPU scale;
- and
- a scale displayed on one of said sections for at least two parameters selected from the group consisting of Defects per Million Opportunities (DPMO), Sigma Rating and C.sub.pk that each measure how defect-free a product is, a statistical distribution of a specific characteristic of the product and its mean-shift over time being set to establish a one-to-one relationship between the parameters so that a single movement of said sliding section to align given DPU and OpCount values with each other calculates and displays the values for the selected parameters, the display of at least two said parameters increasing the amount of data available to a user and facilitating correlation of the different parameters.
3 more elements
A slide rule for Six Sigma calculations, comprising:
- a stationary scale display section;
- a sliding scale display section that slides relative to said stationary section;
- a First Time Yield (FTY) scale displayed on one of said sections;
- an Opportunity Count (OpCount) scale displayed on the other of said sections in alignment with said FTY scale;
- and
- a scale displayed on one of said sections for at least two parameters selected from the group consisting of Defects per Million Opportunities (DPMO), Sigma Rating and C.sub.pk that each measure how defect-free a product is, a statistical distribution of a specific characteristic of the product and its mean-shift over time being set to establish s one-to-one relationship between the parameters so that a single movement of said sliding section to align given FTY and OpCount values with each other calculates and displays the values for the selected parameters, the display of at least two said parameters increasing the amount of data available to a user and facilitating correlation of the different parameters.
3 more elements
A slide rule for Six Sigma calculations, comprising:
- a stationary scale display section;
- a sliding scale display section that slides relative to said stationary section;
- a scale representing Opportunity Count (OpCount) displayed on one of said sections;
- a plurality of scales representing at least two of a first set of Six Sigma parameters consisting of Defects per Million Opportunities (DPMO), Sigma Rating and C.sub.pk that each measure how defect-free a product is and are displayed on the same section as said OpCount scale;
- and
- at least one scale representing at least one of a second set of Six Sigma parameters consisting of Defects per Unit (DPU) and First Time Yield (FTY) displayed on the other of said sections, a statistical distribution of a specific characteristic of the product and its mean-shift over time being set to establish a one-to-one relationship between the parameters in said first set so that a single movement of said slide scale display to align said OpCount and second set parameter scales calculates and displays the values for the selected parameters in said first set, the display of at least two said parameters increasing the amount of data available to a user and facilitating correlation of the different parameters.
3 more elements
Dependencies are inferred from the claim text.