Lesson No.Lesson No.0707

Week No.Week No.0404

Lesson NameLesson Name

Hacksaw Frame & BladeHacksaw Frame & Blade

Use:- To cut the material like rod, pipes, plates, sheets of various thickness

Types:-

1. Solid Hacksaw frame:- Only a particular standard length of blade can be fitted to this frame.

HACKSAW FRAME

2. Adjustable Hacksaw frame (Flat):-

Different standard lengths of blades can be fitted to this frame.

3. Adjustable Hacksaw frame (Tubular):- This is the commonly used type. It gives a better grip and control, while sawing.

Material:- Low alloy steel or High speed steel

HACKSAW BLADES

Types:-

1. All hard blades :- These blades are hardened to the full length between the pin holes.

2. Flexible blades :- For these types of blades, only the teeth are hardened. Because of their flexibility, these blades are useful for cutting along curved lines.

Pitch:- 1. Coarse – 1.8 mm 2. Medium – 1.4 to 1 mm. 3. Fine – 0.8 mm

Pitch:-

1. Coarse (1.8 mm) :- For soft synthetic and plastic materials.

2. Medium(1.4 to 1 mm) :- For tool steel, medium hard steel, copper alloys.

3. Fine(0.8 mm) :- For thin work piece sections.

Blade settings:-

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. This type of setting is done blades of fine grade and super fine grade.

QUESTIONS

1. Which type of Hacksaw frame are used in 1. Which type of Hacksaw frame are used in workshop ?workshop ?

2.2. Which material are used in HacksawWhich material are used in Hacksaw blade ?blade ?

CONCLUSION

Student will understand Types , Material & uses of Student will understand Types , Material & uses of Hacksaw & Blade.Hacksaw & Blade.