The teeth of hacksaw blade are bent Strikethrough
(A) Towards right
(B) Towards left
(C) Alternately towards right and left and every third or fourth left straight
(D) May be bent in any direction
- A file removes the metal during
(A) Forward stroke
(B) Return stroke
(C) Both forward and return strokes
(D) None of these
The Correct Answer and Explanation is :
1. The teeth of a hacksaw blade are bent:
The correct answer is (C): Alternately towards right and left, and every third or fourth left straight.
Explanation:
Hacksaw blades are designed with teeth that are bent alternately to the right and left. This alternating set pattern ensures that the blade cuts efficiently and allows for the removal of chips during the cutting process.
In some cases, every third or fourth tooth is left straight, which helps in clearing the chips from the cutting area. This design reduces friction and heat buildup, leading to a smoother cutting action and prolonging the life of the blade.
This tooth setting pattern is commonly used in hacksaw blades to enhance cutting performance and efficiency.
2. A file removes metal during:
The correct answer is (A): Forward stroke.
Explanation:
Files are cutting tools used to remove material from a workpiece through abrasion. They are designed to cut only on the forward stroke, with the return stroke serving to reposition the file for the next cut. This design prevents the file from cutting in the return direction, ensuring that the cutting action is controlled and efficient.
The teeth of a file are cut in such a way that they engage the material during the forward stroke, allowing for the removal of small amounts of material with each pass. This method provides a smooth finish and precise control over the material removal process.
Understanding the proper use of files is essential for achieving the desired surface finish and dimensional accuracy in machining and metalworking tasks.
For a visual explanation on hacksaw blade selection and tensioning, you might find the following video helpful: