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Why is the pressure removed from the blade of a power hacksaw on the return stroke?

  1. To increase cutting speed

  2. To prevent damage to the blade

  3. To reduce wear on the machine

  4. To improve material stability

The correct answer is: To prevent damage to the blade

The pressure is removed from the blade of a power hacksaw on the return stroke primarily to prevent damage to the blade. During the cutting process, the blade experiences significant stress as it engages the material. If pressure were maintained during the return stroke, this could lead to unwanted wear or deformation of the blade. Removing the pressure allows the blade to retract freely without the risk of causing it to bend or break, thereby extending its lifespan and maintaining its effectiveness for future cuts. In the context of the other options, while increasing cutting speed, reducing wear on the machine, and improving material stability are all important considerations in machining, they do not directly address the specific concern of blade integrity during the return stroke. Proper management of blade pressure is essential to ensure both the quality of the cut and the longevity of the tool.