- 1). Place the micrometer in the palm of your right hand. If you think of the micrometer as a lowercase "b" turned 90 degrees clockwise, your fifth finger curls around the inside of the loop (a.k.a. the frame), securing it to your hand. Meanwhile, your ring and middle fingers extend freely into the air behind the shaft of the "b" as you control the turning ratchet head between your thumb and index finger. To see a full diagram, visit http://feh.osu.edu/Tutorials/micrometer/parts.html.
- 2). Twist the ratchet head toward you. This will cause cause the spindle to move away from the anvil.
- 3). Continue twisting the ratchet until the space between the anvil and spindle is slightly larger than the diameter of the ball bearing.
- 4). Grasp the ball bearing between the tip of your left hand's thumb and index finger.
- 5). Hold the ball bearing on the center of the anvil.
- 6). Twist the ratchet head away from you, causing the spindle to move closer to the anvil.
- 7). Stop turning the ratchet once the spindle's surface presses against the ball bearing. Don't attempt to "tighten" the spindle onto the ball bearing. Simply stop turning once you feel resistance.
- 8). Write down the largest integer that the marker on the hub passed. For example, if the hub's marker is between 3 and 4 inches, you would write "3."
- 9). Look at the notches circling the edge of the thimble.
- 10
Add the measurement marked on this edge to the value from Step 8, after the decimal point. For example, if the thimble's measurement said "24," the ball bearing's total diameter measurement would be "3.24 inches."
previous post
next post