Types of gauges

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

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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

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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 a dvantages 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 [email protected] Matoshri College of Engineering and Reserch Center