Pre control and Statistical Process Control (SPC) are key tools for determining the process that goes into a product.
SPC is a key ingredient of Quality. It is an important step in reducing nonconformities and defects in any manufacturing process. SPC charts help to detect assignable causes of a process change in a timely fashion. SPC helps to identify root causes and take corrective actions before the development of the product has reached such a stage that carrying changes out is neither practicable nor useful.
Examples of process changes that SPC helps to detect include trends, shifts and variation. Three items are needed for SPC to meet its goal:
o A system that measures effectiveness in real-time
o Tolerance that is practical and is connected to customer keenness and satisfaction
o A dial indicator that comes with an anticipated response.
All these help SPC to determine whether a process is stable and requires no adjustment, is incapable of performing its functions altogether, or is deviating but capable.
And now, pre-control
Pre-control, on the other hand, inspects the units and adjusts the process and the succeeding sampling procedures assuming where the measurements are placed in relation to the specification limits. The focus of pre-control is individual measurements.
It uses a set of probabilities, based on assumed distributions and the location of the process, to estimate where there is a justification for the process adjustments. Since decisions concerning pre-control are based broadly, i.e., on the area in which the measurements; it obviates the need for charting, as it is very responsive to the process signals right from the start.
SPC or pre-control?
There are arguments for and against the use of SPC and pre-control as an effective means of ensuring that the process is right and that it results in the desired quality for the product.
At a webinar that is being organized by Compliance4All, a leading provider of professional trainings for all the areas of regulatory compliance, the speaker, Jd Marhevko, who has been involved in Operations and Quality/Lean/Six Sigma efforts across a variety of industries for more than 25 years, will explain all the aspects of pre-control. To hear her perspective of pre-control, please register for this webinar by visiting http://www.compliance4all.com/control/w_product/~product_id=501074?...
What makes this webinar special is that it has consistently ranked in the top 1-5% at previous conferences at more than five venues. It was featured in ASQ QMD's special edition of the Quality Management Forum's 2015 Spring edition (ASQ-QM.org). A webinar of this topic was provided in 2015 via the ASQ QMD Linkage Technical Committee to over 1300 respondents through the IMA and ASQ QMD.
Tools needed for pre-control
At this hour-long session, Jd will explain all the elements of pre-control in Quality. she will show to participants the way of drafting and creating a pre-control chart. She will run a process in which to model the next steps and decisions.
The aim of this session is to equip participants with the knowledge needed for reducing the complexity of the system and bringing about an improvement in the effectiveness and efficiency of their Quality Management Systems.
A session packed with interaction and practical application of principles
A major component of this webinar on SPC and pre-control is that Jd will share the result of case studies. The knowledge gained at this webinar can be applied immediately at their work in respect to the following:
- Measurement System Analysis (MSA): Jd will conduct a high level overview of MSA. This will help the participants get a grasp of the need for putting an effective measuring system in place ahead of implementing pre-control
- Cpk Overview: To help participants gain baseline capability in advance of implementation of pre-control, a high level Cpk overview will be conducted
- Normal Distribution: The way in which the cumulative distribution function of the normal distribution is to be used for estimating and establishing the zones on a pre-control chart
- Pre-Control Chart: Jd will show participants how to apply the concepts listed above with the use of a mock pre-control chart where the process will be demonstrated based on the “go/no go” zones that are established.
At this webinar, Jd will cover the following areas of pre-control:
o Reduce process complexity and minimize risk
o Increase affectivity of a Core Tool
o Increase personnel compliance in proactive process management.