# SPC for Particulate Alert/Action Levels

C

#### Cec28007

Can anyone suggest a good resource to describe how to set alert/action levels for particulate results based on SPC? We have minitab, I'm just having a hard time knowing how to utilize it to establish our internal alert/action levels. Any good articles, webinars, seminars that describes the process and does a good job of it, I'm looking for something that is very specific. Alot of what I'm finding is very general, simply says to 'use SPC' to set levels. Ultimately, I don't know how to, so I need assistance at a basic level.

R

#### randomname

First thing you need to do is study what SPC is all about. The statistical control limits are usually the action levels, although you can use other indications (runs, trends, etc.) if you want. Also need to understand difference between control limits and specifications.

#### Steve Prevette

##### Deming Disciple
Staff member
Super Moderator
Generally speaking, SPC has its control limits set at three standard deviations from the average of some past, stable data. If you are talking Industrial Hygiene here, what you will be detecting is CHANGE in exposure levels, which may be better to react to the change before you reach regulatory limits.

Dr. Wheeler has a simple, thin book called "Understanding Variation, the Key to Managing Chaos" which is a good buy. Unfortunately, the host of my materials on the internet got taken down a few years ago.

Off to the Chalk River site next week to help them with SPC and metrics. . .

#### bobdoering

Trusted Information Resource
Shewart charts expect that your variation is independent and random - otherwise it is a special cause. So, you need to determine if that is the type of variation you are experiencing. In order to determine the type of charting that is appropriate, first you need to understand the nature of your variation. What are the variances that affect the particulate level (total variance equation)? Is the particulate level a random variable? Or does it change as a function of time? Have you performed a time-ordered sequence data collection? How much of the variation is systemic, and how much is measurement noise? What is your "gage R&R" of your particulate level measurement technique? This blog may also help...

SPC procedure / flow chart Statistical Analysis Tools, Techniques and SPC 2
Informational SPC in Batch Processing Statistical Analysis Tools, Techniques and SPC 3
Handling lower detection limits for SPC and process performance Statistical Analysis Tools, Techniques and SPC 1
How to reduce the process SPC monitoring Capability, Accuracy and Stability - Processes, Machines, etc. 3
SPC for machining processes Capability, Accuracy and Stability - Processes, Machines, etc. 1
What is the best way to control special characteristics in Control plan? Is it Mandatory to have SPC for IATF 16949? IATF 16949 - Automotive Quality Systems Standard 12
SPC - Stamping parts - Small batch size Statistical Analysis Tools, Techniques and SPC 6
Attributes SPC study - Attributive control (Go gage) Statistical Analysis Tools, Techniques and SPC 5
Anyone Familiar with "SPC for Excel" add-in? Lean in Manufacturing and Service Industries 4
Assignable cause/corrective action list for SPC Software Statistical Analysis Tools, Techniques and SPC 3
SPC for special characteristics - CSR - Control of SC and CC Statistical Analysis Tools, Techniques and SPC 1
Determining SPC tolerance Statistical Analysis Tools, Techniques and SPC 21
L SPC - Methods to collect data IATF 16949 - Automotive Quality Systems Standard 7
Steve Prevette's Statistical Process Control (SPC) "Library" Statistical Analysis Tools, Techniques and SPC 0
SPC for Eddy Current Testing Statistical Analysis Tools, Techniques and SPC 28
S SPC (Statistical Process Control) for Unilateral Tolerance - Questions Statistical Analysis Tools, Techniques and SPC 6
Informational Use of Classical SPC in Precision Machining Statistical Analysis Tools, Techniques and SPC 9
J Recommendations on Inspection/SPC Software Statistical Analysis Tools, Techniques and SPC 4
Q Real Time Electronic SPC/Control Charting Statistical Analysis Tools, Techniques and SPC 4
Other types of Control Charts described in Chapter II of SPC Manual Statistical Analysis Tools, Techniques and SPC 6
A Electric terminal crimping machines - Is SPC appropriate for this process? Manufacturing and Related Processes 4
J Properly understanding SPC - Newbie SPC questions Statistical Analysis Tools, Techniques and SPC 34
SPC Charting frequency calculator for X hi/lo chart Imported Legacy Blogs 0
Handy training tip for SPC - the Check Engine Light Analogy Statistical Analysis Tools, Techniques and SPC 0
SPC Software for MAC computers Statistical Analysis Tools, Techniques and SPC 2
SPC based Dashboards - By Steve Prevette (November 2017) Statistical Analysis Tools, Techniques and SPC 1
SPC Work Instructions (WI) Statistical Analysis Tools, Techniques and SPC 2
S Doubts about SPC taken in Machining - Part has +-0.01 Tolerance Statistical Analysis Tools, Techniques and SPC 5
Short Term vs. Long Term SPC Study - Where is Cp and Cpk Defined Statistical Analysis Tools, Techniques and SPC 8
E SPC for Dummies - The correct meaning of all the graphs Statistical Analysis Tools, Techniques and SPC 3
Can/should SPC be applied to Computer Assembly and Software Imaging? Statistical Analysis Tools, Techniques and SPC 8
P Recommendations on SPC Software or Excel SPC add-in(s) Quality Assurance and Compliance Software Tools and Solutions 6
Not all characteristics follow a Normal Distribution - How do you do SPC Chart Capability, Accuracy and Stability - Processes, Machines, etc. 5
T SPC in Insurance Back Office Operations Service Industry Specific Topics 4
SPC Production - Getting Cpk and Ppk Statistical Analysis Tools, Techniques and SPC 8
M SPC with many data points from one dimension Statistical Analysis Tools, Techniques and SPC 16
Mixed data collection (SPC) for different mold cavities Statistical Analysis Tools, Techniques and SPC 2
M How to Start SPC from the ground up! Statistical Analysis Tools, Techniques and SPC 8
Available SPC and Metrology Consultants Paid Consulting, Training and Services 0
I SPC on Cyclic Data Statistical Analysis Tools, Techniques and SPC 10
SPC Card for One Sample Size - Customer requires for all critical dimensions Statistical Analysis Tools, Techniques and SPC 8
R Quality Management & SPC Manufacturing and Related Processes 1
Is SPC data For Special Characteristics always required? TS 16949 clause 8.1 ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 2
How to Start SPC in a Shaft Grinding Section Statistical Analysis Tools, Techniques and SPC 1
A I-MR SPC used for Inspection Statistical Analysis Tools, Techniques and SPC 7
E SPC data from multiple Excel files Statistical Analysis Tools, Techniques and SPC 5
S Where to Get SPC Training to Measure our Processes? Training - Internal, External, Online and Distance Learning 12
SPC Short Run Advice of a Stamping Process Statistical Analysis Tools, Techniques and SPC 3
SPC in Heat Treatment Workshop Statistical Analysis Tools, Techniques and SPC 2
S SPC Control Limit Calculation Statistical Analysis Tools, Techniques and SPC 2