Hacksaw frame: A hacksaw frame is used along with a blade to cut metals of different sections, and is specified by the type and maximum length of the blade that can be fixed.
Hacksaw blades are specified by the length, pitch and type of material.(The width and thickness of blade is standardized)
(The width and thickness of blade is standardized)
Types of hacksaw frames
- Solid Frame hacksaw
- Adjustable Frame hacksaw
1. Solid Frame hacksaw
Only a blade of a particular standard length can be fitted to this frame. e.g 300 mm or 250 mm.
2. Adjustable Frame hacksaw
Different standard lengths of blades can be fitted to this frame i.e. 250 mm and 300 mm.
Adjustable frame hacksaw is the most commonly used type. It gives a better grip and control, while sawing.
A hacksaw blade is made of either low alloy steel (LA) or high speed steel (HSS), and is available in standard lengths of 250 mm and 300mm.
Type of hacksaw blades
- All-hard blade
- Flexible blade
1. All-hard blade
The full length of the blade between the pins is hardened and it is used for harder metals such as tool steel, die steel and High Carbon Steel.
2. Flexible blade
Only the teeth are hardened. Because of their flexibility these blades are useful for cutting along curved lines. Flexible blades should be thinner than all-hard blades.
Setting of Hacksaw Teeth
To prevent the hacksaw blade binding when 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 the setting of the hacksaw teeth.
There are two types of hacksaw teeth settings.
- Staggered set
- Wave Set
1. Staggered set
Alternate teeth or groups of teeth are staggered. This arrangement helps for free cutting, and provides for good chip clearance.
2. Wave set
In this, the teeth of the blade are arranged in a wave-form.