Hi guys in this lecture we start to study Limit gauges and its types and information So without washing of time let's discuss further information,

Limit gauges and its types and information

Limit gauges are used for measurements to display the dimensional information. So let's start the further information.

A limit gauge is a precision tool used to check the dimensions of a part or product against specified tolerances. It ensures that the dimensions are within acceptable limits for proper fit, function, and quality. This tool is critical in manufacturing to maintain accuracy and consistency in production processes.

Limit gauges designed on Taylor's principal.

Limit gauges are to check weather hole and shaft coming within specified tolerance or not.

Main types of Limit gauges-

1) Plug gauge

2) Snap gauge

3) Pin gauge

4) Ring gauge

5) Feeler gauge

6) Radius gauge

7) Screw pitch gauge

8) Caliper gauge

So let's start one by one type-

1) Plug gauge:-

Plug gauge are used for hole and ring gauges are used for shaft.

These gauges are designed according to Taylor's principal which has two statement.

A) Go gauges are designed at maximum material limit condition.

B) NoGo gauges are designed at minimum material limit condition.

GO/NOGO Gauge

 When go gauge inside the hole it means mean size of hole more than size of go gauge.

 When nogo gauge doesn't go inside the hole it mean the size of hope is less than the size of nogo gauge.

When GO gauge goes and NOGO gauge does not go. It mean the hole in correct tolerance.

If GO gauge doesn't go inside the hole it mean the hole in under size and NOGO  gauge enter the hole it mean the hole is over size.

2) Snap gauge-

 GO and NOGO gauges both on single piece.

This gauge is U shaped.

Statement of tailor's:-

GO gauges are used to check the size as well as shape and has to be full form and NOGO gauges are uesd to check one element at a time.

Snap gauge

Since GO gauge covering entire working length of hole and shaft. So there will be some wear on gauges so wear allowance are provided over go gauge.

3) Pin gauge-

Tolerances: 

Pin gauges are manufactured to a tolerance of +0.002 mm. or ± 0.001 mm. to the nominal size. 

Sets:

Pin gauge sets ranging from 0.5 mm. to 20 mm. 

diameter in increments are made according to customer needs. 

Pin Gauge

Pin Holding Cases: 

Individual pins are supplied in a plastic case. Pin gauge set are an attractive melamine coated wooden type for long life and easy to storage.

Application-

Measuring Pins for check of bore centre distance of the object , groove measurement, gear type dimensions etc.

4) Ring gauge-

Ring Gauges are used for measuring outside dia. of object. A ring gauge is also useful to check out of roundness.

Ring gauge

A master setting ring is used as a set bore gauges, which can  used to determine difference from master size.

5) Feeler gauge-

Feeler gauge are used to check the flatness of the part or the object.

Gauge used to check flatness And the gap in mating part. 

Range : 0.05mm to 1.0 mm 

Filler gauge

sometimes you need exact gap, feeler  gauges are the perfect help.

6) Radius gauge-

Radius Gages are used for checking  concave or convex radius.

Ring gauge

  Possible to verify radius or fillet dimensions easier, faster and more accurately in machining. 

The measuring surfaces are finished with smooth, accurate edges.

7) Screw pitch gauge-

Screw pitch gages are among the most useful tools in any mechanics' tool box. They calculate the pitch of various threads.

Screw pitch gauge

screw pitch gauges are available in a wide range of size with numbers of leaves in various pitch ranges.

8) Caliper gauge-

Caliper gauge is corresponding to snap gauge. Use to measure inside and outside dimensions.

Caliper gauge

Uses Of Limit Gauges

A limit gauge is a precision measuring tool used to determine the conformity of a part's dimensions to specified tolerances.

It's commonly used in manufacturing to ensure that machined parts meet the required specifications. 

Limit gauges come in various types, including plug gauges, ring gauges, snap gauges, and thread gauges, each suited for different types of measurements. 

They are critical in maintaining quality control and ensuring the interchangeability and functionality of parts in various industries such as automotive, aerospace, and machinery manufacturing.

So this lecture we study the main types of limit gauges and its detail information. This information useful in the mechanical industry related works or Machine shops.

Any queries comment below thank you.