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Basic 7 QC Tools Explained in Just 4 minutes | Narender Sharma - YouTube
Channel: Shakehand with Life
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to solve almost every kind of problem in a
factory or elsewhere the seven fundamental
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tools required are
process flow chart, check sheet, histogram,
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pareto diagam, fishbone diagram, scatter diagram
and control charts
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these 7 quality tools help to improve managerial
decision making skills
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collect, present and analyse the data,
implement six sigma
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control cost of poor quality
reduce variations and improve quality
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reduce defects and improve productivity
reduce cycle time and improve efficiency
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the first tool is process flow chart
everything goes through the process hence
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to track the trouble spots of the process
we need this chart
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process flow chart
showcases the whole picture of the process
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streamlines the process
understands how inputs convert into output
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reduces waste
improves efficiency
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reduces cycle time
reduces idle time
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finds the trouble spots in the process
identifies the va and nva activities
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trains a new comer
the second tool is check sheet
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this tool is used to count and confirm the
physical presence of defects and defectives
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this tool confirms the physical presence of
defects and defectives
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compiles the data of defects and defectives
used tally marks for counting defects and
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defectives
the third tool is histogram,
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this tool is used to present large amount
of data by means of frequency bars for different
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class intervals.
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class intervals are taken on x-axis, while
the frequencies are taken on y-axis.
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histogram is an spc technique
describes process variation
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measures process capability
evaluates spread of the data
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presents large amount of data
confirms symmetry in the data, and
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in the absence of symmetry, the histogram
showcases the skewness present in the data.
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the fourth tool is pareto analysis.
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this tool is used to find vital few causes
instead of trivial many.
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pareto analysis invented by an italian economist
alfredo pareto
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also called 80-20 rule
it is the combination of bar diagram and line
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graph.
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actual frequencies are taken on primary vertical
axis, shown by vertical bars in descending
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order, and
percentage cumulative frequencies are taken
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on secondary vertical axis shown by line graph
in ascending order
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to correct a problem we need to fix the root
cause
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to find the root cause for an effect we need
fishbone diagram
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this tool is our fifth tool
fishbone diagram named, as its shape seems
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like the bone structure of a fish
also called the cause and effect diagram
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also known as the ishikawa diagram after the
name of prof.
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kaoru ishikawa, the japanese quality guru.
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the effect is written on extreme right on
the middle arrowhead.
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main causes of the effect on both sides connecting
by the arrows towards the main arrow, and
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sub-causes under each main cause connecting
by small arrows
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the 6th tool is scatter diagram.
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the tool confirms the relation between two
variables like speed and mileage
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different patterns of scatter diagram are
given hereunder
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perfect +ve correlation
perfect -ve correlation
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high degree +ve correlation
high degree 鈥搗e correlation
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zero correlation
to control process variations we need control
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chart
control chart is seventh tool
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the chart which maintain the accuracy of the
data is mean chart
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mean chart is the presentation of sample mean
values between the control limits i.e. upper
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control limit and lower control limit
the chart which maintain the precision of
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data is range chart
range chart is the presentation of sample
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range values between the control limits
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