TOOL-M 19
COMPETENCY
Use an outside micrometer with interchangeable anvils; explain how to use 4" to 5" outside micrometer.
ADMINISTRATION
DEMONSTRATE: The Qualifier will have the employee use an outside micrometer with interchangeable anvils. The Qualifier will have the employee calibrate and take one measurement using a 4" to 5" outside micrometer with interchangeable anvils. The outside micrometer shall be equipped with a ratchet stop and locknut.
PROCEDURE
The employee will demonstrate as follows:
1. When to use the outside micrometer?
2. How to read the scale?
NOTE: The steps listed below outline a generic procedure.
1. Calibration procedure:
a). Determine the approximate diameter of the item being measured.
b). Select the interchangeable anvil required for the item being measured.
1. This can be determined by the following example:
i. Reading obtained in Step a. is 4-1/2".
ii. Interchangeable anvil required would be 4" to 5".
NOTE: When this interchangeable anvil is installed and calibrated, only items between 4" and 5" may be measured.
c). Remove the existing interchangeable anvil from the frame by unscrewing the locking collar from the interchangeable anvil. Remove the interchangeable anvil from the frame.
d). Install the interchangeable anvil that was selected in Step b. into the frame. Install the locking collar and secure.
e). Clean all dirt and grit from the anvil and spindle contact surfaces, using a lint free cloth.
f). Rotate the locknut counterclockwise to release the spindle lock.
g). Rotate the thimble until it is approximately midrange on the sleeve.
h). For the purpose of this example, select a 4" standard and place it between the spindle and anvil.
NOTE: A standard is a rod of precision length is used for calibrating micrometers.
i). Clean all dirt and grit from each end of the standard.
j). Hold the standard against the anvil while turning the thimble clockwise with the ratchet stop.
k). Continue turning the thimble until the standard is contacting the anvil and spindle, and the ratchet clicks.
l). Rotate the locknut clockwise to engage the spindle lock.
m). Check to see if the zero line on the thimble aligns with the horizontal line on the sleeve at the zero mark. If alignment is present, the micrometer is calibrated.
n). If alignment is not present, loosen the locking collar on the interchangeable anvil. Turn the adjusting collar on the interchangeable anvil slightly. Tighten the locking collar on the interchangeable anvil.
o). Repeat Steps e. through n. until the zero line on the thimble aligns with the horizontal line on the sleeve at the zero mark.
2. Measurement procedure:
a). Rotate the locknut counterclockwise to release the spindle lock.
b). After ensuring the micrometer is in calibration, turn the thimble counterclockwise until the area between the anvil and spindle is slightly larger than the item being measured.
c). Clean all dirt and grit from the item being measured, using a lint free cloth.
d). Ensure the item being measured is positioned evenly between the anvil and spindle.
e). Using the ratchet stop, turn the thimble clockwise until the item being measured is contacting the anvil and spindle, and the ratchet clicks.
f). Rotate the locknut clockwise to engage the spindle lock.
g). Remove the micrometer from the item being measured.
h) Read the micrometer.
1. Add the smaller number on the measuring rod used, to the thimble and sleeve reading for the total micrometer measurement.
a). If the numbers on the measuring rod are 4" to 5", the whole inch reading will be 4.000".
b). The readings obtained on the thimble and sleeve will be in thousandths of an inch (e.g., .178").
c).Add the reading obtained in (Step a) to the reading obtained in (Step b) for the total micrometer reading (e.g., 4.178").
i). Rotate the thimble clockwise until the zero lines on the thimble and sleeve coincide to prevent dust and dirt from accumulating on the sleeve.
j). Store the micrometer.
TOOL-M 19 COMPETENCY Use an outside micrometer with interchangeable anvils; explain how to use 4" to 5" outside micrometer. ADMINISTRATION DEMONSTRATE: The Qualifier will have the employee use an outside micrometer with interchangeable anvils. The Qualifier will have the employee calibrate and take one measurement using a 4" to 5" outside micrometer with interchangeable anvils. The outside micrometer shall be equipped with a ratchet stop and locknut. PROCEDURE The employee will demonstrate as follows: 1. When to use the outside micrometer?2. How to read the scale? NOTE: The steps listed below outline a generic procedure. 1. Calibration procedure: a). Determine the approximate diameter of the item being measured. b). Select the interchangeable anvil required for the item being measured. 1. This can be determined by the following example: i. Reading obtained in Step a. is 4-1/2". ii. Interchangeable anvil required would be 4" to 5". NOTE: When this interchangeable anvil is installed and calibrated, only items between 4" and 5" may be measured. c). Remove the existing interchangeable anvil from the frame by unscrewing the locking collar from the interchangeable anvil. Remove the interchangeable anvil from the frame. d). Install the interchangeable anvil that was selected in Step b. into the frame. Install the locking collar and secure. e). Clean all dirt and grit from the anvil and spindle contact surfaces, using a lint free cloth. f). Rotate the locknut counterclockwise to release the spindle lock. g). Rotate the thimble until it is approximately midrange on the sleeve. h). For the purpose of this example, select a 4" standard and place it between the spindle and anvil. NOTE: A standard is a rod of precision length is used for calibrating micrometers. i). Clean all dirt and grit from each end of the standard. j). Hold the standard against the anvil while turning the thimble clockwise with the ratchet stop. k). Continue turning the thimble until the standard is contacting the anvil and spindle, and the ratchet clicks. l). Rotate the locknut clockwise to engage the spindle lock. m). Check to see if the zero line on the thimble aligns with the horizontal line on the sleeve at the zero mark. If alignment is present, the micrometer is calibrated. n). If alignment is not present, loosen the locking collar on the interchangeable anvil. Turn the adjusting collar on the interchangeable anvil slightly. Tighten the locking collar on the interchangeable anvil. o). Repeat Steps e. through n. until the zero line on the thimble aligns with the horizontal line on the sleeve at the zero mark. 2. Measurement procedure: a). Rotate the locknut counterclockwise to release the spindle lock. b). After ensuring the micrometer is in calibration, turn the thimble counterclockwise until the area between the anvil and spindle is slightly larger than the item being measured. c). Clean all dirt and grit from the item being measured, using a lint free cloth. d). Ensure the item being measured is positioned evenly between the anvil and spindle. e). Using the ratchet stop, turn the thimble clockwise until the item being measured is contacting the anvil and spindle, and the ratchet clicks. f). Rotate the locknut clockwise to engage the spindle lock. g). Remove the micrometer from the item being measured. h) Read the micrometer. 1. Add the smaller number on the measuring rod used, to the thimble and sleeve reading for the total micrometer measurement. a). If the numbers on the measuring rod are 4" to 5", the whole inch reading will be 4.000". b). The readings obtained on the thimble and sleeve will be in thousandths of an inch (e.g., .178"). c).Add the reading obtained in (Step a) to the reading obtained in (Step b) for the total micrometer reading (e.g., 4.178"). i). Rotate the thimble clockwise until the zero lines on the thimble and sleeve coincide to prevent dust and dirt from accumulating on the sleeve. j). Store the micrometer.
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