5/12/20151 Exp.3: Micrometers &Feeler, Pitch, Radius and Dial gauges Exp.3

OBJECTIVE To demonstrate the correct method of measuring using an outside micrometer. To become familiar with micrometer. To show the correct choice and use of gauge sets. To identify the common types, length, diameter, grade, and thread pitch of threaded fasteners. 5/12/20152 Exp.3: Micrometers &Feeler, Pitch, Radius and Dial gauges

Micrometers A micrometer is a widely used device in mechanical engineering for precisely measuring thickness of blocks, outer and inner diameters of shafts and depths of slots. Micrometers have several advantages over other types of measuring instruments like the vernier caliper they are easy to use and their readouts are consistent. A micrometer generally provides greater precision than a caliper, but can measure a smaller range of lengths. 5/12/20153 Exp.3: Micrometers &Feeler, Pitch, Radius and Dial gauges

Micrometers Types Outside Micrometer Inside Micrometer Depth Micrometer 5/12/20154 Exp.3: Micrometers &Feeler, Pitch, Radius and Dial gauges

Micrometers Types (CONT.) Vernier Micrometer Digital Micrometer Dial Micrometer 5/12/20155 Exp.3: Micrometers &Feeler, Pitch, Radius and Dial gauges

Micrometer Parts 5/12/20156 Exp.3: Micrometers &Feeler, Pitch, Radius and Dial gauges

Micrometer Reading A= 7.38mm B=7.72mm 5/12/2015 Exp.3: Micrometers &Feeler, Pitch, Radius and Dial gauges7

Feeler Gauge A feeler gauge is a simple tool used to measure thicknesses. It is mostly used in engineering to measuring the clearance between two parts.. Taper & Parallel feeler gauge is a feeler gauge of tapered, as opposed to parallel, shape. 5/12/20158 Exp.3: Micrometers &Feeler, Pitch, Radius and Dial gauges

Radius Gauge A radius gauge is a tool used to measure the radius of an object. 5/12/20159 Exp.3: Micrometers &Feeler, Pitch, Radius and Dial gauges

Thread Pitch Gauge It used to quickly determine the pitch of various threads by matching the teeth on the leaves with teeth on the work. 5/12/2015 Exp.3: Micrometers &Feeler, Pitch, Radius and Dial gauges10

Questions 1. Describe the procedure of the experiment. 2. Determine class average, standard deviation, the percentage of error and accuracy for the micrometer measurements. 3. What are the sources of error in the measurements with micrometer? 4. List the types of micrometers (with figures and its function). 5. Mention the function of the micrometer parts (slide 6). 5/12/2015 Exp.3: Micrometers &Feeler, Pitch, Radius and Dial gauges11