Hacksaw frame and blade

  Hacksaw Frame and Blade                                                              

Hacksaw:

a hacksaw frame is used along withblade to cut of different sections and is specified by the type and maximum length of the blade that can be fixed .

Example. 

Adjustable hacksaw frame-tubular-250-300 or 8"-12"

Types of hacksaw fram 

SOLID FRAME : Solid frame only a blade of the particular standard  length can be fitted to this frame. eg. 300mm for 250mm.

 Adjustable frame (flat type) :

  Different standard length of bladescan be fitted to this frame.

 example: 250 mm and 300mm.

 Adjustable frame (Tubular type): this is  the most common used type. It gives a batter grip and control, while swaing.

 

Parts of a hacksaw frame 

1) Handle

2) Frame

3) Tubular frame with holes for length adjustment 

4) Retaining pins 

5) Fixed blade-holder 

6) Adjustable blade-holder 

7) wing nut 

A hacksaw blade is made of eitherLow alloy steel(LA) or High speed steel (HSS) and is available in standard length of 250 mm and 300mm.

Parts of a hacksaw blade

1) Back Edge

2) side 

3) Central Line 

4) Pinholes 

Type of Hacksaw Blades

All-hard blade: The full length of the blade between the pins is hardend and it is used for harder metals such as tool steel, die steel and high carbon steel.

Flexible blade:Only the teeth are hardend.becauseof their flexibility This blades areuseful for cutting a long curvedlines.fixable blades should be thinner than all had blades

Pitch of the blade:  thedistance between adjacent teeth is known as the pitch of the blade.

Specification: Hacksaw Bladesare specified by the length,  pitch, and type of material.

To prevent the hacksaw bladebinding whene penetrating into the material, and to allow free movement of The Blade , the cut is to be broader than the thickness of the hacksaw blade. This is achieved by setting of the hacksaw teeth. There are two types of hacksaw teeth setting.

Staggered Set: Alternate teeth or groups of teeth are  staggered . This arrangement help to free cutting and provides for good cheap clearance .

Wave set: in this the teeth of blade are arranged in a web form. the types of set for different pictures are as follow.

Selection of blade:   Theselection of the blade depends on the shape and hardness of the material to be cut.

Pitch selection: for sof materials such as bronze, brass, soft steel, cast iron, heavy angles etc. use a 1.8 mm pitch blade. 

for Tool steel, High Carbon Steel, High speed steel etc. Use a 1.4 mm pitch.

 for angle iron, brass tubing , copper, iron pipe, etc. use a 1 mm pitch blade. 

For  thin tubing, sheet metal work etc. use a 0.8 mm pitch.