Process Capability - How much percentage of tolerance?

J

JAI GANESH

#1
#1
In a automotive manufacturing process, to achieve 1.67 Cp, how much percentage of tolerance i must have to use. Can any one help me out??
 
12 questions to ask before buying a QMS
Elsmar Forum Sponsor
Bev D

Bev D

Heretical Statistician
Staff member
Super Moderator
#3
#3
It's 60%. The inverse of the index gives the proportion of the tolerance 'consumed' by the process. If you look at the formula you will see that it is a measure of the tolerance divided by a measure of the process spread. So 1/1.67 = .6. Which is 60%

But remember the Xpk indices include the SD of the process AND the location of the process average in relation to the tolerances.
 
You must log in or register to reply here.
Thread starter Similar threads Forum Replies Date
M Measuring Capability of Process with Multiple Specifications Capability, Accuracy and Stability - Processes, Machines, etc. 6
L How to evaluate the process capability of a data set that is non-normal (cannot be transformed and does not fit any known distribution)? Capability, Accuracy and Stability - Processes, Machines, etc. 12
T Final process capability results - What I am supposed to present? Cp and CpK? APQP and PPAP 11
Q How to perform Process Capability for true position Statistical Analysis Tools, Techniques and SPC 10
L IATF 16949 Cl. 8.3.3.2 Manufacturing process design input - Process capability IATF 16949 - Automotive Quality Systems Standard 1
Y Process Capability for Non-Normal Data - Philosophical Questions Capability, Accuracy and Stability - Processes, Machines, etc. 6
M Process Capability in a High Precision Environment Capability, Accuracy and Stability - Processes, Machines, etc. 7
V Product Development - When to start calculating Process Capability Capability, Accuracy and Stability - Processes, Machines, etc. 3
S Proving Process Capability of a Packing Machine Capability, Accuracy and Stability - Processes, Machines, etc. 6
ncwalker Process Capability Study - Aggregate vs. Individual Processes Statistical Analysis Tools, Techniques and SPC 24
V Process Capability for parameters with non-normal distribution. Capability, Accuracy and Stability - Processes, Machines, etc. 16
S Regression Control Chart - Process Capability Statistical Analysis Tools, Techniques and SPC 18
M How to determine Process Capability using Minitab 17 Capability, Accuracy and Stability - Processes, Machines, etc. 6
B Process Capability - Changing Limits to Improve Cpk or find Root Causes? Capability, Accuracy and Stability - Processes, Machines, etc. 6
B Long Term Process Capability from miltiple Machines and Fixtures Capability, Accuracy and Stability - Processes, Machines, etc. 3
E What Data do we need for Welding and Repair Process Capability? Six Sigma 1
K Calculating Capability of a process when data is skewed in the upper range Capability, Accuracy and Stability - Processes, Machines, etc. 4
S What is the difference between Process Capability and Machine Capabilty Capability, Accuracy and Stability - Processes, Machines, etc. 13
V How to Assess Process Capability at the Development or Optimization Phase Capability, Accuracy and Stability - Processes, Machines, etc. 6
C Minitab Binomial Process Capability Analysis Chart Explanation Using Minitab Software 1
kedarg6500 Sample Size for Short Term & Long Term Process Capability Capability, Accuracy and Stability - Processes, Machines, etc. 2
J Is it the same process capability or performance in 8.2.3.1 and SPC? IATF 16949 - Automotive Quality Systems Standard 1
E Binomial Process Capability Sample Size - Variables Data Capability, Accuracy and Stability - Processes, Machines, etc. 4
M On Subgroups in Control Charts and Process Capability Statistical Analysis Tools, Techniques and SPC 3
N SPC and Process Capability Using a Romer Arm Statistical Analysis Tools, Techniques and SPC 6
J Interpreting Process Capability results and ratios Capability, Accuracy and Stability - Processes, Machines, etc. 1
J Go or No-Go Process Capability Quality Tools, Improvement and Analysis 8
S Process Capability with Negative Exponential Distribution Capability, Accuracy and Stability - Processes, Machines, etc. 4
C Process Capability - Attribute Data Analysis (Template) Document Control Systems, Procedures, Forms and Templates 0
C Process Capability - Variables Data Analysis (Template) Document Control Systems, Procedures, Forms and Templates 0
A Cnpk (Non-Parametric Capability Analysis) to assess whether the Process is Stable Capability, Accuracy and Stability - Processes, Machines, etc. 7
V Process Capability to reconfirm the Inspection Frequency Manufacturing and Related Processes 3
B Sample Size based on Process Capability Indices (Pp/Ppk)? Capability, Accuracy and Stability - Processes, Machines, etc. 20
P Calculating Process Capability from Data of attached spreadsheet Statistical Analysis Tools, Techniques and SPC 4
D How to measure Process Capability for Homogeneous Batch Manufacturing Capability, Accuracy and Stability - Processes, Machines, etc. 4
A Burrs affecting measurements and Process Capability Capability, Accuracy and Stability - Processes, Machines, etc. 7
G Assessing Process Capability on Variation (Hardware Adjustment Mean Shift) Capability, Accuracy and Stability - Processes, Machines, etc. 4
D Calculating Upper-CL/Lower-CL and Process Capability Statistical Analysis Tools, Techniques and SPC 8
V Defining Subgroups and Importance of Subgroups in SPC and Process Capability Statistical Analysis Tools, Techniques and SPC 6
T Process Capability - Understanding what Process Capability Indices mean Capability, Accuracy and Stability - Processes, Machines, etc. 17
Q TS 16949 Process Capability Requirements - Cpk ≥ 1.67 on All Key Parameters? IATF 16949 - Automotive Quality Systems Standard 8
S Process Capability questions - Calculating Cpu using Minitab Six Sigma 6
C Sample Size Calculation Formula for Process Capability Statistical Analysis Tools, Techniques and SPC 25
D Capability Analysis for Packing Process in Food Manufacturing Capability, Accuracy and Stability - Processes, Machines, etc. 11
Q When to use Cpk or Ppk for a Process Capability Study? Capability, Accuracy and Stability - Processes, Machines, etc. 14
S Process Capability on Basic Dimensions Capability, Accuracy and Stability - Processes, Machines, etc. 10
D Process Capability Study which involves MMC (Maximum Material Condition) Capability, Accuracy and Stability - Processes, Machines, etc. 8
E Process Capability Analytical Tools Statistical Analysis Tools, Techniques and SPC 1
J Process Capability - Interview Case Study Capability, Accuracy and Stability - Processes, Machines, etc. 1
B Overall Process Capability - Simple question if you know how to answer it! Statistical Analysis Tools, Techniques and SPC 3

Similar threads

Top Bottom