Try Square: Parts, Types, Grades, Checking Accuracy, Uses

Hello friends, Today we are going to discuss try square which is the part of metrology.

In which you will learn all aspects related to try square such as parts, types, checking accuracy methods, uses, etc.

A try square is an instrument that is used to check the flatness and squareness of the surface. 

The Tri Square measures approximately 0.002 mm of precision per 10 mm of length, which is accurate enough for most workshop surfaces.

What is Try Square?

Try square is a checking tool that is used to check the flatness of the job and the right angle (angle of 90 °) between two surfaces.

Try Square is made of hardened steel.  

It is available in lengths of 100mm, 150mm, 200mm.

It is also called Engineer's Square.

Parts of Try Square

 It has two main parts

  •  Blade
  •  Stock

See in figure parts of a try square.

parts of try square
Parts of Try Square

The thinner part of the tri square is called the blade and the thicker part is called the stock.  

The blade and stock are set at a 90 angle. 

The surface of the blade is marked with mm, cm or inch.

Types of Try Square

There are the following types of try square are used.

  • L Square
  • Carpenter's Try Square
  • Engineer's Try Square

See in figure types of try square which are described below.

types of try square
Types of Try Square

L Square

The blades and stock of the L square are thin and of equal thickness (about 1.5 mm).  

It is usually made of mild steel.  

British and Metric system marks are made on both its sides.  

It is mostly used by masons or tailors.

Carpenter's Try Square

Carpenter's try square stock is made of cast iron, aluminum, or hardwood. 

Its blade is made of steel.  

It is used by Carpenter.

Engineer's Try Square

Engineer's Try Square is the purest and most accurate.  

Its blade and stock are made of the same metal.  

These types of try square are mostly used by engineers.

Engineer's tri square is further classified into three types.

  • Solid Try Square
  • Adjustable Try Square
  • Die Maker's Try Square

Show in the figure types of engineer's Try square which are described below in detail.

types of engineer's try square
Types of Engineer's Try Square

Solid Try Square 

In this type of try square, the blade is joined to the stock by a rivet at an angle of 90 degrees, so that the blade remains fixed in one place with the stock, hence it is also called a fixed try square.  

This type of tri square is used for simple tasks.

Adjustable Try Square

In this try square, the blade is not attached to the stock, but the stock can be adjusted using a knurled nut on the top of the blade.  

It is used where solid tri square cannot be used.  

In this type of tri square, the angles on either side of the stock are right angles.

Die Maker's Try Square

It is used to give different types of relief angles while making a die.  

Its stock has two screws at the bottom. 

A large screw is used to clamp the blade to a position with the stock.

The angle formed between the small screw blade and the stock can be set at a slightly greater or lesser angle than the right angle (90 °).  

Its set consists of four blades.

Grades of Try Square

There are following grades are used in a try square.

  • A Grade
  • B Grade
  • C Grade

 A Grade

Master Try Square for Reference

B Grade

For Inspection in Tool Room

C Grade

Used in Workshops

Checking Accuracy of Try Square

There are the following two methods employed for checking the accuracy of a try square.

  • By Master Try Square
  • By Surface Plate

By Master Try Square

In this, the angle of 90 ° is measured by the master try square.

If the light comes between the two blades when both are placed on the surface plate, then it is impure.

By Surface Plate 

In this, by placing the tri square on the edge of the surface plate, draw a line with the blade on the surface plate, then by turning the tri square, again draw a line from the other side at the same place.  

If both the lines are parallel then it should be understood that the tri square is pure.  

If both the lines are not parallel then the tri square is wrong and should not be used.

Uses of Try Square 

  1. To check the flatness of the surface.
  2. To check the angle of 90 °.
  3. To draw parallel lines and to check them.
  4. To draw perpendicular lines on the edge of the job.  
  5. To set the job at right angles.

Precautions While Using Try Square 

  1. Do not mix it with other cutting tools.
  2. It should be cleaned before and after work.  It should be protected from falling.
  3. It should never be used as a hammer or screwdriver.
  4. When Tri Square is not being used, it should be kept in a safe place by applying light grade oil on it.

In this topic, we’ve discussed What is try square, parts of try square, as well as their uses, precaution, etc.

I hope you like this post.

Thank You. 

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Unknown said…
Thank you sir for information
Please post about iti fitter tools
and theory information