Millwright Level 1 Practice Exam

How much material should be left for reaming?

1. 0.001"

2. 0.005"

3. 0.010"

4. 0.015"

The correct answer is: 0.005"

When reaming, it is important to leave an appropriate amount of material to ensure that the final hole dimensions are achieved with precision. Leaving 0.005" of material is a common practice because it allows the reamer to remove just enough material to achieve a smooth, accurate finish without causing excessive wear on the reamer itself or creating an undue amount of heat from friction. This amount of material also provides a bit of a buffer to account for any minor inconsistencies in the initial hole that may be present before reaming. It strikes a balance between adequately preparing the hole and ensuring that the reaming operation is efficient and effective in achieving the desired tolerances and surface finish. The other options represent either too little material, which may not allow for proper reaming, or too much, which can lead to inefficiency and potential issues with dimensional accuracy.