Types of gauges-plain

1. Matoshri College of Engineering and Research Center
Nashik
Department of Mechanical Engineering
Subject:- Metrology And Quality Control
Class:-TE Mechanical
Unit: I Measurement Standards and Design of gauges
Semester:-V
2020-21
By
Prof R.S.Patil
(Assistant Professor MCOERC )

2. Contents (Session 3)
Unit – I Measurement standards and Design of gauges
 Types of gauges-plain plug gauge,
 ring gauge
 snap gauge
 limit gauge and gauge materials
Matoshri College of Engineering and Research Center Nashik

3. Matoshri College of Engineering and Research Center Nashik

4. FEELER GAUGE
 Use for precise spacing inspection by inserting into the
gap between two flat surfaces
 Narrow strip of sheet (steel made)
 Work on sense of feel
 It starts from 0.04 – 1mm
 Each blade is marked with thickness
Matoshri College of Engineering and
Research Center Nashik

5. Matoshri College of Engineering and
Research Center Nashik

6. Limit Gauges
 Limit gauging is adopted for checking parts produced by
mass production.
 It has the advantage that they can be used by unskilled
persons. Instead of measuring actual dimensions, the
conformance of product with tolerance specifications can be
checked by a GO and NO GOgauges.
 A GO gauge represents the maximum material condition of
the product (i.e. minimum hole size or maximum shaft size)
and conversely a NO GO represents the minimum material
condition (i.e. maximum hole size or minimum shaft size)
Matoshri College of Engineering and Research Center Nashik

7. Plug Gauge
 Plug gauges are the limit gauges used for checking holes and
consist of two cylindrical wear resistant plugs.
 The plug made to the lower limit of the hole is known as GO
end and this will enter any hole which is not smaller than the
lower limit allowed.
 The plug made to the upper limit of the hole is known as NO
GO end and this will not enter any hole which is smaller than
the upper limit allowed.
Matoshri College of Engineering and Research Center Nashik

8. Plug Gauge (Cont)
Matoshri College of Engineering and Research Center Nashik

9. Ring Gauge
 Ring gauges are used for gauging shafts.
 They are used in a similar manner to that of GO & NO GO plug
gauges.
 A ring gauge consists of a piece of metal in which a hole of
required size is bored.
Matoshri College of Engineering and Research Center Nashik

10. SNAP (or) GAP GAUGES:
 A snap gauge usually consists of a plate or frame with a
parallel faced gap of the required dimension.
 Snap gauges can be used for both cylindrical as well as non
cylindrical work as compared to ring gauges which are
conveniently used only for cylindrical work.
 Double ended snap gauges can be used for sizes ranging from
3 to 100 mm.
 For sizes above 100 mm up to 250 mm a single
ended progressive gauge may be used.
Matoshri College of Engineering and Research Center Nashik

11. SNAP (or) GAP GAUGES(Cont.)
Matoshri College of Engineering and Research Center Nashik

12. Taylors Principle
 Taylor’s Principle state that, GO Gauge Should Check all
possible dimensions at a time i.e. roundness, location ,size
where as NO-GO Should Check only one dimension at one
time
Matoshri College of Engineering and Research Center Nashik

13. Wear Allowance
 The GO gauges only are subjected to wear due to rubbing
against the parts during inspection and hence a provision has
to be made for the wear allowance. Wear allowance is taken
as 10% of gauge tolerance and is allowed between the
tolerance zone of the gauge and the maximum material
condition.
Matoshri College of Engineering and Research Center Nashik

14. Assignment 4
Q1) State Taylor's principle of gauge design, Draw progressive type plug
and snap gauge.
Q2) Short notes on
i)Feeler and Radius Gauges
ii) Plate Gauge
Q3) What are the advantages of Limiting Gauges
Q4) Design GO and NOGO limit plug Gauge for Checking a hole having Size 60
-0.000,+0.06 Assume gauge makers tolerance to 10% of work tolerance
abd wear tolerance is equal to 10% gauge makers tolerance
Any Question
 patil.roshaneng@gmail.com
Matoshri College of Engineering and
Reserch Center