Hacksaw blades with fine-pitched teeth are more effective on which of the following?

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RRB ALP Mechanic Diesel 21 Jan 2019 Official Paper (Shift 1)
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  1. Soft metal
  2. Non-metal
  3. Thick metal
  4. Thin metal

Answer (Detailed Solution Below)

Option 4 : Thin metal
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Detailed Solution

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Explanation:

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.
  • 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.

Pitch of the blade:

  • The distance between adjacent teeth is known as the ‘pitch’ of the blade.
  • Hacksaw blades with fine-pitched teeth are more effective on thin metal.

Pitch \(\frac{Length~of~blade}{Number~of~teeth~on~blade}\)

Classification

Pitch

Coarse

1.8 mm

Medium

1.4 mm & 1 mm

Fine

0.8 mm

Pitch

Type of set

0.8 mm

Wave set

1 mm

Wave set or staggered set

Over 1 mm

staggered set

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