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Everybody knows quality control is important. Here at SQC Online we use the power of the Internet to help you apply Statistical Quality Control
(SQC) and Statistical Process Control (SPC) tools
and software in your own work environment. And it's all
FREE! Tables and Standards - Do you need to assure the quality of products delivered to you in batches? Many standard-setting organizations adopted the Military Standard Tables for sampling inspection. Below are online versions of Military Standard Tables (equivalent to the civilian ANSI/ASQC standards). You can find out how many items to sample, and how to decide if your goods are up to your specs. |
| Table | What is it for? | Civilian Counterpart |
|---|---|---|
| Military Standard 105E | Sampling plans for attribute data | ANSI/ASQC Z1.4, ISO 2859, BS6001 |
| Military Standard 414 | Sampling plans for measurement data | ANSI/ASQC Z1.9, ISO 3951, BS6002 |
| Sampling inspection plans for continuous production, Procedure CSP-1 | ||
| MIL-HDBK-217 | Calculation of MTBF and failure rates for electrical and electronic components, devices, and equipment. |
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SQC Calculators - Does your process meet the
specs? |
| Calculator | What is it for? |
|---|---|
| Control Charts for Variables | Compute limits for x, S and R control charts |
| Control Charts for Attributes | Compute limits for c, p, u and np |
| MTBF Calculator | Calculate the MTBF for a system given the part (component) failure rate |
| Process Capability Index | Find out if your process meets the specifications by calculating Cp and Cpk |
| Control Charts and Runs Rules
Many procedures in industry are
based on the concepts of run. A run is a sequence of identical events,
such as a sequence of winnings in a slot machine.
Many such procedures are based on rules of thumb,
rather than on theory. Below are web applications that
are based on the latest theory developed in this field.
The applications show you what you would
expect if applying one of these run-rules procedures. Tell more more about control charts. |
| Procedure | Where are runs encountered? | Example |
|---|---|---|
| Switching Rules for Military Standard 105E | Switching rules between different levels of inspection | "Switch from normal to tightened inspection following 5 consecutive accepted batches" |
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Switching Rules for Continuous Sampling |
Switching rules between phases of sampling | "Switch from 100% inspection to partial sampling after 5 consecutive conforming items" |
| Western Electric Company (WECO) Rules |
The detections of small shifts. Tell me more about control charts |
"Signal an alarm if 8 consecutive points fall on one side of the center line" |
| System Reliability | Consecutive-type systems | "The system fails if 3 consecutive components fail" |
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Learn about Run-Related Distributions |
| Procedure | What is it for | Example |
|---|---|---|
| Waiting for the first run | Find the distribution of the waiting time for a specified run given a sequence of IID bernouli trials |