Question

1. why is it important to clamp a workpiece to a workbench or drill press table before drilling a hole in it?
2. true or false? a workpiece should be put into firm contact with a bench grinder’s abrasive wheel before the grinder is turned on.
3. some cleaning tanks are equipped with a(n) ____ which automatically closes the lid in case of fire.
4. label the parts of the micrometer in the following illustration. image of micrometer with labels a - g
5. to measure the diameter of a cylinder, you should use a(n) ____ micrometer.
6. a(n) ____ micrometer should be used for taking measurements in narrow grooves.
7. each small space on the sleeve of a standard micrometer represents a distance of ____ an inch.
8. each space on the thimble of a standard micrometer represents a distance of ____ an inch.
9. assume that the micrometers in the following illustration are 0–1″ standard micrometers. read the scales and record your answers in the appropriate blanks. images of micrometer scales labeled a, b, c

Explanation:

Question 21

Clamping the workpiece secures it, preventing movement during drilling. Movement can cause the drill bit to slip, leading to inaccurate holes, damage to the workpiece, drill bit, or even injury to the operator. It ensures safety and precision.

A bench grinder's abrasive wheel should not have the workpiece in contact before turning on. When the grinder starts, the wheel may spin unevenly or cause the workpiece to be thrown, leading to injury or damage. The grinder should be turned on first, and then the workpiece is brought into contact gently. So the statement is false.

Some cleaning tanks have a fire - safety device called a fusible link or a fire - activated closure mechanism (like a fusible plug - type device) that melts in case of fire, causing the lid to close automatically to contain the fire and prevent the spread of flames or hazardous fumes. A common term for this is a "fusible link" or "fire - safety closure", but more specifically, a "fusible plug" or "fire - activated lid closer". However, the most common term in this context is a "fusible link" or a "fire - safety device", but the typical component here is a fusible link (or sometimes a "fire - activated closure").

Answer:

To prevent the workpiece from moving during drilling, which ensures accuracy, protects the drill bit and workpiece, and prevents operator injury.

Question 22