The document discusses tolerances and allowances in manufacturing. It defines tolerance as the acceptable variation from a nominal dimension, with three common types being limit, unilateral, and bilateral tolerances. Allowance is defined as a planned deviation from nominal to account for dimensional changes during future manufacturing processes, such as grinding or heat treating. The document explains that tolerances and allowances are important for interchangeable parts, product design, quality control, and manufacturing efficiency.
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Introduction to Mechanical Measurements and Metrology taruian
Introduction to Metrology: Definition, objectives of metrology, Material Standards, Wavelength Standards, Classification of standards, Line and End standards, Calibration of End bars. Numerical examples.
GD&T is an international way of describing a part accurately. It is used widely in all manufacturing sectors for part dimensioning. This ppt contains basic overview of GD&T. The detailed version will be uploaded soon.
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chapter-5 Limits, classification Fits and Tolerances.SHITALUDAGAVE2
It is impossible to produce a part to an exact size or basic size, some
variations, known as tolerances, need to be allowed.
The permissible level of tolerance depends on the functional requirements, which cannot be compromised
2. For more help contact me
Muhammad Umair
Bukhari
Engr.umair.bukhari@gmail.com
http://onlinemetallurgy.com
3. Introduction
Modern industry has developed on the basis of
interchangeable manufacturing.
Interchangeable manufacturing means production of
parts to such a degree of accuracy as is necessary to
permit assembly and proper functioning of parts
without further machining or fitting.
To set the dimension for many product we make
certain gages that measure dimensions. So gages
used for interchangeable manufacturing.
4. Tolerance
• “The total amount by which a
given dimension may vary, or the
difference between the limits.”
5. Design Specifications and Tolerance
Develop from quest for production quality and
efficiency.
Early tolerances support design’s basic function.
Mass production brought interchangeability.
7. Product design
Product Design has the responsibility
of designing with consideration for
the maximum possible working
tolerances compatible with the
functional requirements of the design.
8. Manufacturing
Manufacturing has the responsibility
of bringing the design into a physical
entity with consideration for process
methodologies, capabilities and
economics.
9. Quality control
Quality control has the responsibility
of measuring and evaluating the final
product to ensure the integrity of the
product tolerance.
10. Variation is Unavoidable
• No two manufactured objects are
identical in every way. Some degree
of variation will exist.
• Engineers apply tolerances to part
dimensions to reduce the amount of
variation that occurs.
11. Tolerances
A tolerance is an
acceptable amount
of dimensional
variation that will
still allow an object
to function
correctly.
12. Tolerances
A tolerance is an
acceptable amount
of dimensional
variation that will
still allow an object
to function
correctly.
14. Limit Dimensions
Limit dimensions are
two dimensional values
stacked on top of each
other. The dimensions
show the largest and
smallest values allowed.
Anything in between these
values is acceptable.
15. These are limit dimensions,
because the upper and
lower dimensional sizes are
stacked on top of each other.
Limit Dimensions
20. Allowance
Allowance is a planned deviation between an
actual dimension and
a nominal or theoretical dimension, or between an
intermediate-stage dimension and an intended
final dimension
21. example
Outer dimensions (such as the length of a bar) may be
cut intentionally oversize, or inner dimensions (such as
the diameter of a hole) may be cut intentionally
undersize, to allow for a predictable dimensional change
following future cutting, grinding, or heat-
treating operations.
For example:the outer diameter of a pin may be ground
to 0.0005 inches (0.013 mm) oversize because it is
known that subsequent heat-treatment of the pin is going
to cause it to shrink by 0.0005 inches (0.013 mm).
A hole may be drilled 0.012 inches (0.30 mm) undersize
to allow for the material that will be removed by
subsequent reaming.
22. Tolerance ALLOWANCE
A tolerance is the limit of
acceptable unintended de
viation from a nominal
or theoretical dimension.
Therefore, a pair of
tolerances, upper and
lower, defines a range
within which an actual
dimension may fall while
still being acceptable.
an allowance is
a planned deviation from
the nominal or theoretical
dimension
whereas allowance is one
that we give to the
material to undergo some
process in the future.
Difference