Common questions to ask when investigating and out of control process

-

Common questions to ask when investigating and out of control process
are there differences in the measurement accuracy of instruments used ?
▢ Yes   ▢ No

Are there differences in the methods used by different operators ?
▢ Yes   ▢ No

Is the process is affected by the environment (e.g. temperature, humidity, etc) ?
▢ Yes   ▢ No

Has there been a significant change in the environment?
▢ Yes   ▢ No

Is the process affected by tool wear?
▢ Yes   ▢ No

Where any untrained workers involved in the process at the time?
▢ Yes   ▢ No

has there been a change in the source of raw materials?
▢ Yes   ▢ No

Is the process affected by operator fatigue?
▢ Yes   ▢ No

Has there been a change in maintenance procedures?
▢ Yes   ▢ No

Is the machine being adjusted frequently?
▢ Yes   ▢ No

Did the samples come from different machines? Shifts? Operators?
▢ Yes   ▢ No

Are operators afraid to report double “bad news”?
▢ Yes   ▢ No 

Is samples taken at regular intervals ? 
▢ Yes   ▢ No

Comments

Post a Comment

Popular posts from this blog

Control Chart, Statistic control, common and special cause variation

-
Image
Control Chart The control chart is a graph used to determine  process variation over time. A control chart always has a central line for the average, an upper line for the upper control limit and a lower line for the lower control limit. These lines are determined from historical data. Statistic Control Output is within the control limit or absence of point beyond the control limit         then process is said to be statistical control Or Special cause / Assignable * cause have been removed from process         then process is said to be statistically controlled process. The variations in process can classified into common cause and special cause variations Common cause variation ( chance cause variation ) : this variation occur due to factors which are inherent in the process e.g. normal tool wear Inappropriate procedures Poor design Poor maintenance of machines Lack of cle...
Read more

16 major losses

-
Loss Tree 16 major losses during production activities Why required to control this 16 major losses during production activities? -  To reduce over all cost of production - to reduce material loss, energy loss, effort loss - manufacturing cost it is also a part of the quality plus competition Click here to join quality engineering WhatsApp group (not recommended) Click here to join quality engineering group on telegram (recommended) Loss Tree 16 major losses during production activities (A) machine related losses that reduce overall equipment efficiency 1. Failure losses (also known as breakdown loss)  Machine is schedule for production but not running due to some failure (breakdown) or some sort down time longer than two minute should have a reason associated with it and it shall be considered equipment failure Examples: unplanned stop /downtime,  tooling failure, breakdown, unplanned maintenance, no operator or materials...
Read more

Problem Solving Techniques

-
Image
Problem Solving Techniques To decide which problem to be addressed first (or next) Define the problem in terms of What it is, Where it occurs, When it Happens, and its extent Find out all possible causes of the problems To agree on basic cause (s)bof the problem To develop effective and implementable solution and action plan Implement the solution and establish needed monitoring procedure and chart             The Seven QC Tools It is a set of Graphical technique for problem solving related to quality The seven tools are: Cause-and-effect diagram (also known as the "fishbone" or Ishikawa diagram) Check sheet. Control chart. Histogram. Pareto chart. Scatter diagram. Stratification (alternately, flow chart, run chart, Pie Chart, Bar chart), Brainstorming Selection of QC Tools for Problem Solving Techniques 1 To decide which problem to be ...
Read more