What happens when sawing faster than 40 to 50 strokes per minute with a hand-held hacksaw?

When sawing with a hand-held hacksaw at speeds exceeding 40 to 50 strokes per minute, the blade tends to dull more rapidly. This is because increased speed generates more friction and heat, which can wear down the teeth of the blade. A dull blade will not cut effectively and may require more effort, leading to inefficient cutting. Additionally, the cutting motion may become less precise, resulting in poor quality cuts. Maintaining a moderate and controlled speed is important for extending the life of the blade and ensuring effective cutting performance.