1. MASTER OF TECHNOLOGY
IN
AUTOMOBILE ENGINEERING
SUBMITTED BY
ROHIT NIMADE
(A2326213019)
BATCH (2013-2015)

2. STATISTICAL PROCESS CONTROL:-
• It is the application of statistical methods to monitor and
control a process to ensure that it operates at its full
potential to produce conforming product.
OR
• it is an analytical decision making tool which allow you to
see when process is working correctly and when it is not.
• variation present in any process, deciding when variation
is natural and when it need correction is the key to quality
control.

3. TYPES OF VARIATION
Two kinds of variation occur in all manufacturing process.
1. Natural or common cause variation:-
It includes variations in temperature, properties of raw
material etc.
2. Special cause variation:-
With sufficient investigation, a specific cause, such as
abnormal raw material or incorrect set-up parameters,
can be found for special cause variation.

4. TERMS IN SPC
 Process
 Stable Process
 Control Chart
 Feed Rate
 Cycle Time
 Materials
 Control plan

5. PROCESS
 A process is a step by step activity which is use to transform
raw material into finish products.
 It contains many steps.
 Measuring of each parts
 If variation occurs
 Different process

6. STABLE PROCESS
 Run on constant mode.
 No variations.
 If variation occurs it can be made stable
 It leads to better manufacturing.

7. CONTROL CHART
 Tool use to monitor.
 It tells continuous improvement.
 All points lie between upper limit and lower limit.

9. FEED RATE
 Cut given to component.
 Customer requirement.
 Depends on CNC machine input.

10. CYCLE TIME
 Time to manufacture the component.
 Depends upon complete operations.
 Components having different cycle time.

11. MATERIALS
 Semi finish products.
 Rough parts.
 Hard parts.

12. CONTROL PLAN
 A sheet with a drawing of component.
 Specification provided.
 Operator have to follow the control plan.
 Depends upon the customer need

14. PARAMETER TO BE ENSURE
 Machine
 Parts name
 Operation
 Customer
 Instruments used

15. MEASURING EQUIPMENTS
Measurement is very important for us to know, the job is
coming out in exact size, over size, or under size.
 Air- plug gauge
 Dial gauge
 Micrometer
 Lead profile tester
 Surface finish tester

16. AIR PLUG GUAGE
 Works on compressed air.
 Use for measuring OD/ID
 Used in microns.
 Having master piece before checking
 Give exact reading.

18. DIAL GAUGE
 Use for measuring thickness.
 Can be work in mm and microns.
 Measures the thickness no that correct if we dont use
digital gauge.

20. MICROMETER
 Use to check measuring over pin.
 Used to check distance of teeth.
 Check in microns.

22. LEAD PROFILE TESTER
 Use to check grinding quality of teeth.
 Where the less metal is occurs.
 Shows where the variations occurs.
 Using of graph paper.

24. SURFACE FINISH TESTER
 Tells about the surface finish of the component.
 Tells about the life of tool.
 Good quality of component obtained.

26. METHADOLOGY
 CNC Machine whose behaviour have to check.
 Inspect everything inside the machine.
 parameters like (room temperature, machine temp.
Etc)
 Note down all the parameters of the machine before
running.

27.  Set all the equipments to its correct value for measuring
the component.
 Let operator put the readings according to control plan in
machine.
 Clamp the raw material and start the machine.
 Not down cycle time.
 Clean the machine if it is not able to clean itself properly.
 Take out the job from machine and check is pricesly.

28. TOOLS FOR SPC
 Control chart
 R- chart
 X-chart
 Histograms.

29. CONTROL CHART
 Control chart shows the variations in jobs.
 Having upper limit, lower limit.
 Also shows about the rejection on component, having
undersize and oversize.

30. R-CHART, X-CHART & HISTOGRAM
 R-Chart shows the ranges.
 X-Chart shows the variations.
 Histograms shows the highest level of variation.

31. 5 M’S OF SPC
 Man
 Machine
 Method
 Material
 Mileu

32. ADVANTAGES OF SPC
 It improves the performance by reducing variability of
the component.
 Improve machine efficiency.
 Provide higher quality by reducing variations and
defects.
 Minimize rework.
 Eliminate unnecessary quality checking process.
 Reduce returning of parts from customers.

33. DISADVANTAGE OF SPC
 Time taking process.
 Repeatable process.
 If spc of one machine is done, it doesnt mean the
machine wont need to perform spc again.
 Man power need process.
 Constantly performing process.
 All reading should be specific, coz it can fail the whole
work.

34. RESULT

35. THANK YOU!