Gauge is an inspection tool used to check product dimensions against maximum and minimum acceptable limits without knowing the exact value. There are different types of gauges classified by type, application, form, design, and specific application. Gauges provide advantages like faster checking, less operator dependence, and checking multiple dimensions simultaneously. However, gauges cannot provide exact values and lose accuracy over time. Common gauges include snap and ring, plug, radius, filler, and taper gauges. Snap and ring gauges check diameters while plug gauges check holes. Radius and filler gauges measure radii and gaps.

1. LIMIT
GAUGES
Name:- Patel Shrikunj C.
Enrollment NO. :- 126540319070

2. What is a Gauge?
 Gauge is an inspection tool used to check
product dimension with reference to it’s
maximum and minimum acceptable limit. It is
generally used to segregate acceptable and
non acceptable product in mass production,
without knowing exact value of dimension.

3. Classification of limit gauge.
•According to type / use 1) Standard gauge.
2) Limit gauge.
•According to application 1) Work shop gauge.
2) Inspection gauge.
3) Master / Reference gauge.
•According to form 1) Plug gauge.
2) Snap and ring gauge.
•According to design /
construction
1) Fixed limit gauge.
2) Indicating gauge.
3) Combination gauge.
•According to specific application 1) Screw pitch gauge.
2) Radius gauge.
3) Filler gauge.
4) Taper gauge.

4. Advantages of gauging:-
 Faster checking regarding whether product is
within its specified limit or not can be done.
 Less dependence on operator skill and hence
result are not getting affected by operator
judgment.
 More than one dimension of product can be
checked at a time as well as properties such
as roundness, taper etc. as can be checked at
a time.
 Gauges are economical then measuring
instruments.

5. Limitations of limit gauges:-
 Exact value of product dimension can not be
known.
 Accuracy of gauges is getting affected due to
wear and tear with passage of time.
 It is useful only for similar product because its
difficult to manufacture and maintain large size
gauges.

6. Instruments used for gauging:-
 Snap and ring gauge.
 Combined gauge.
 Plug gauge.
 Radius gauge.
 Filler gauge.
 Screw pitch gauge.
 Template and form gauge.
 Taper gauge.

7. Snap and ring gauge.
 The gauge used to check eternal details of the
product such as diameter of a shaft, thickness
of block etc. it is called snap and ring gauge.
Snap gauge is used for cylindrical as well as
non-cylindrical work-pieces whereas ring
gauge is used only for cylindrical work-pieces.
 Go member of snap / ring gauge will have
dimension equal to higher limit of shaft and not
go member will have dimension equal to lower
limit of the shaft diameter.

8. Figure of snap and ring gauge.

9. Combined gauge.
 This gauge is used to check larger size holes.
Here go and not go member are provided at
one side of the same gauge body. Gauge is
inserted in the hole to check go dimension and
the titled to check no go dimension this is
shown in figure below.

10. Plug gauge.
 The gauges are used to check internal details
of the product, such as hole diameter. As per
IS-3484 plug gauges should be manufactured
from hardened steel, which can resists wear
and tear during checking. Figures below
indicates different varieties of plug gauge.
 Go member of the plug gauge will have
dimension equal to lower limit of the hole
dimension and not go member will have
dimension equal to higher limit of the hole
dimension.

11. Figures of different plug
gauges.

12. Radius gauge and Filler gauge.
 To measure and check internal and external
radius curvature of product radius gauge is
used. As shown in figure below it consists of
many strips having different size of radius from
on it.
 It is used to measure the small gap between
surface two mating part our slot width as
shown in figure it is also consisting of different
strips of different thickness.

13. Figure of radius and filler gauge