40 Questions
What is the purpose of transfer measurement?
To physically check a diameter or linear distance with an indirect measuring tool
What is the primary cause of parallax reading error?
The viewer's eyes not being inline or perpendicular to the rule or measuring device
What is the characteristic of indirect measuring tools?
They do not have a physical scale to measure a component
What is the name of the type of caliper that uses a spring to measure?
Spring caliper
What is the name of the part of the spring caliper that is used to adjust the measurement?
Adjusting nut
What is the purpose of telescopic gauges and small bore gauges?
To transfer the dimensions of bores, holes, slots, grooves, and recesses
What is the purpose of keeping the ends of the rule in good condition?
To ensure accurate measurements
Which type of caliper uses a firm joint to measure?
Solid caliper
What is the fractional equivalent of 1/2 in sixteenths?
8/16
What is the purpose of using a dial indicator on a lathe with a 4-jaw chuck?
To compare the profiles on one end of the part with the profiles on the other end
What is the measurement of 1 cm in millimeters?
12 mm
What is the importance of keeping the rule square with the workpiece when taking measurements?
To ensure accurate measurements
What is the result when the dial indicator shows no movement between the two ends of a part on a lathe?
The part is considered aligned
What is the purpose of aligning the milling machine head?
To prevent the machined parts from being out-of-square
What is the result when the dial indicator is set to a zero reading on both ends of a vise?
Any part secured in the vise will be parallel to the machine axes
What is the purpose of using a dial indicator in machine alignment?
To ensure that the machine head is perpendicular to the table
What is the measurement of 1/4 in thirty-seconds?
8/32
What is the measurement of 3.0 inches in sixteenth?
3-0/16"
What is the purpose of a hook rule?
To measure the diameter of a hole
What is the purpose of using a dial indicator on a milling machine table?
To ensure that the workholding device is parallel to the machine axes
What is the purpose of the reference contacts in a dial bore gauge?
To help with alignment to the true axis of the bore
What should be done after finding the lowest reading of the needle on the dial face during the setting/calibration process?
Adjust the bezel of the dial so that the zero mark lines up with this lowest reading
What is the purpose of using a dial indicator in workpiece alignment?
To compare the profiles on one end of the part with the profiles on the other end
What is the formula for actual reading using a dial indicator?
ACTUAL READING = COS O X DIAL READING
What type of micrometer is recommended for increased accuracy during the setting/calibration process?
Vernier micrometer
What is the first step in calibrating a dial bore gauge using a master ring?
Ensure the dial bore gauge and master ring are clean
What is the purpose of a tape measure?
To measure lengths of various objects
What is the first step in setting/calibrating a dial bore gauge with a micrometer?
Ensure the dial bore gauge and micrometer are clean
What is the purpose of rocking the dial bore gauge back and forth during the setting/calibration process?
To find the lowest reading of the needle on the dial face
What is the importance of understanding reading errors when using a rule?
To ensure accurate measurements
What should be done after adjusting the bezel of the dial during the setting/calibration process?
Check the gauge again to ensure the needle points to the zero mark
What is the primary purpose of using a dial bore gauge?
To measure the diameter of a bore and detect any out-of-round conditions
What is the function of the contact plunger in a dial bore gauge?
To measure the diameter of the bore
What is the purpose of rocking the dial bore gauge back and forth during calibration?
To find the lowest reading of the needle on the dial face
What is the function of the reference contacts on the dial bore gauge?
To ensure the gauge is aligned square to the fixture
What is the purpose of creating a gauge block stack up during calibration with a gauge block setting fixture?
To transform the gauge block distance from an outside dimension to an inside dimension
What is the final step in calibrating a dial bore gauge using a master ring?
Check the gauge again to ensure the needle points to the zero mark
What is the purpose of using a master ring in calibrating a dial bore gauge?
To ensure the gauge is aligned to the true axis of the ring
What happens to the gauge block distance when it is placed in the setting fixture?
It is transformed from an outside dimension to an inside dimension
How many times should the dial bore gauge be checked after adjusting the bezel of the dial?
Multiple times until the needle points to the zero mark
Study Notes
Basic Measuring Tools
- Tape measure: a tool used to measure lengths, with markings on the tape to indicate different units of measurement (e.g. inches, centimeters, millimeters)
- How to read a tape measure: video tutorials available
- Rule measurement: using a rule to measure lengths, with markings on the rule to indicate different units of measurement (e.g. inches, centimeters, millimeters)
- Methods of measurement: using a rule to measure rectangular pieces, round stock, and diameters
- Measuring errors: parallax error, worn out rule ends, and taking measurements at an angle
Indirect Measuring Tools
- Definition: indirect measuring tools do not have a physical scale to measure a component, but instead physically check a diameter or linear distance and transfer it to a measuring tool to obtain the proper value
- Transfer measurement (or comparison measurement): the process of physically checking a diameter or linear distance with an indirect measuring tool, and then transferring it to a measuring tool to obtain the proper value
- Calipers: spring calipers and solid calipers, used to measure inner and outer diameters
- Telescopic gauges and small bore gauges: indirect measuring tools used to accurately transfer the dimensions of bores, holes, slots, grooves, and recesses
- Dial indicator correction formula: actual reading = cos O x dial reading
Dial Indicator
- Usage: used to provide a comparison between a measured (or known) feature and another feature
- Workpiece alignment: used to align workpieces on a lathe with a 4-jaw chuck, ensuring that the part is aligned and has a common centerline
- Work holding alignment: used to align workholding devices (such as vises or fixtures) on milling machine tables, ensuring that the part is parallel to the machine axes
- Machine alignment: used to align machines, such as milling machines, to ensure that the head is perpendicular to the table in both axes
- Inspection purposes: used to inspect parts, such as checking for taper in a bore or if the bore is out-of-round
Dial Bore Gauges
- Definition: a comparison tool used to measure diameters, with a dial readout, similar to telescopic gauges
- Setting/calibration: can be set using a micrometer, master ring, or gauge block set fixture
- Usage: used to measure bores, checking for taper and out-of-roundness, with interchangeable ends and reference contacts for alignment
Test your understanding of fractions and line lengths with this quiz. Identify and work with fractions in different denominators and calculate line lengths.
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