Get out your notes notebook. Using Dial Calipers Description and Use

Learning Objectives Be able to use a dial caliper to measure width, depth, step, inside and outside diameters. Test the accuracy of manufactured parts.

Dial Calipers Introduction to Engineering DesignTM Unit 1 – Lesson 1.3 – Measurement and Statistics Dial Caliper Dial Calipers are arguably the most common and versatile of all the precision measuring tools used by engineers and manufacturers Project Lead The Way, Inc. Copyright 2007

Dial Caliper Measurement Dial Calipers Introduction to Engineering DesignTM Unit 1 – Lesson 1.3 – Measurement and Statistics Dial Caliper Measurement Four Measurements Outside Diameter or Object Thickness Inside Diameter or Space Width Step Distance Hole Depth Project Lead The Way, Inc. Copyright 2007

Dial Calipers Introduction to Engineering DesignTM Unit 1 – Lesson 1.3 – Measurement and Statistics Dial Caliper Limit Standard inch dial caliper will measure slightly more than 6 inches Project Lead The Way, Inc. Copyright 2007

Measuring Outside Length Dial Calipers Introduction to Engineering DesignTM Unit 1 – Lesson 1.3 – Measurement and Statistics Measuring Outside Length Measurement made between caliper faces shown Example is outside diameter or object thickness Outside Measuring Faces Project Lead The Way, Inc. Copyright 2007

Measuring Outside Length Dial Calipers Introduction to Engineering DesignTM Unit 1 – Lesson 1.3 – Measurement and Statistics Measuring Outside Length Example of measuring outside length of object Project Lead The Way, Inc. Copyright 2007

Measuring Inside Length Dial Calipers Introduction to Engineering DesignTM Unit 1 – Lesson 1.3 – Measurement and Statistics Measuring Inside Length Measurement made between caliper faces shown Example is slot width or hole Inside Measuring Faces Project Lead The Way, Inc. Copyright 2007

Measuring Inside Length Dial Calipers Introduction to Engineering DesignTM Unit 1 – Lesson 1.3 – Measurement and Statistics Measuring Inside Length Example of measuring inside diameter Project Lead The Way, Inc. Copyright 2007

Measuring Stepped Length Dial Calipers Introduction to Engineering DesignTM Unit 1 – Lesson 1.3 – Measurement and Statistics Measuring Stepped Length Measurement made between caliper faces shown Example is stepped parallel surfaces Step Measuring Faces Project Lead The Way, Inc. Copyright 2007

Measuring Stepped Length Dial Calipers Introduction to Engineering DesignTM Unit 1 – Lesson 1.3 – Measurement and Statistics Measuring Stepped Length Example of measuring step distance Project Lead The Way, Inc. Copyright 2007

Measuring Depth Measurement made between caliper faces shown Dial Calipers Introduction to Engineering DesignTM Unit 1 – Lesson 1.3 – Measurement and Statistics Measuring Depth Measurement made between caliper faces shown Example is depth of hole or recess Depth Measuring Faces Project Lead The Way, Inc. Copyright 2007

Measuring Depth Example of measuring depth Dial Calipers Introduction to Engineering DesignTM Unit 1 – Lesson 1.3 – Measurement and Statistics Measuring Depth Example of measuring depth Work piece shown as section view Dial caliper shortened for clarity Project Lead The Way, Inc. Copyright 2007

Dial Caliper Parts: Blade Dial Calipers Introduction to Engineering DesignTM Unit 1 – Lesson 1.3 – Measurement and Statistics Dial Caliper Parts: Blade Blade is the immovable portion of the dial caliper Slider moves along blade to adjust the distance between the measuring surfaces Slider Blade Project Lead The Way, Inc. Copyright 2007

Dial Caliper Parts: Blade Dial Calipers Introduction to Engineering DesignTM Unit 1 – Lesson 1.3 – Measurement and Statistics Dial Caliper Parts: Blade Blade scale divides each inch into 10 increments Each increment equals one tenth of an inch (0.100 in.) Project Lead The Way, Inc. Copyright 2007

Dial Caliper Parts: Dial and Pointer Dial Calipers Introduction to Engineering DesignTM Unit 1 – Lesson 1.3 – Measurement and Statistics Dial Caliper Parts: Dial and Pointer Pointer rotates within the dial as the slider moves back-and-forth along the blade Dial Pointer Project Lead The Way, Inc. Copyright 2007

Dial Caliper Parts: Reference Edge Dial Calipers Introduction to Engineering DesignTM Unit 1 – Lesson 1.3 – Measurement and Statistics Dial Caliper Parts: Reference Edge Reference edge keeps track of larger increments (i.e., 0.100 in.) as the slider moves along the rack Reference Edge Project Lead The Way, Inc. Copyright 2007

Dial Caliper Parts: Rack Dial Calipers Introduction to Engineering DesignTM Unit 1 – Lesson 1.3 – Measurement and Statistics Dial Caliper Parts: Rack Rear-toothed rack gear is used to change linear motion (slider) to rotary motion (pointer) Rack Project Lead The Way, Inc. Copyright 2007

Dial Caliper Interpretation Dial Calipers Introduction to Engineering DesignTM Unit 1 – Lesson 1.3 – Measurement and Statistics Dial Caliper Interpretation Accurate dial caliper reading requires several steps Project Lead The Way, Inc. Copyright 2007

Dial Caliper Interpretation Each time the pointer completes one rotation within the dial, the reference edge on the slider moves the distance of one blade scale increment (0.100 in.)

Dial Caliper Interpretation Each ‘10’ on the dial represents one hundredth of an inch (0.01 in.) Each graduation (dash) equals one thousandth of an inch (0.001 in.) Estimate between dashes for one ten thousandths of an inch (0.0001 in.)

Dial Caliper Interpretation: Zeroing Before measuring, zero the caliper Close caliper completely Loosen dial lock Rotate dial to read zero Tighten dial lock Dial Lock Zero Alignment

Dial Caliper Interpretation: Practice To determine the outside diameter of this pipe section 2) Identify how many inches are being shown on the blade scale

Dial Caliper Interpretation: Practice Reference edge is located between the 1 and 2 inch marks Record inch significant digit 1 in. Mark 1.000 in.

Dial Caliper Interpretation: Practice 3) Identify the 0.1″ increment marks shown to the right of the last inch mark Record tenth inch significant digit 0.4 in. Mark 1.000 in. 0.400 in.

Dial Caliper Interpretation: Practice 4) Identify the pointer increment mark shown on the dial and record thousands inch significant digits 1.000 in. 0.400 in. 0.037 in. 0.037 in. Mark

Dial Caliper Interpretation: Practice 5) Estimate the ten thousands inch significant digit 1.000 in. 0.400 in. 0.037 in. 0.0001 in. 0.0001 in. estimate

Dial Caliper Interpretation: Practice 6) Add values together for dial caliper measurement 1.000 in. 0.400 in. 0.037 in. + 0.0001 in. 1.4371 in.

Dial Caliper Interpretation: Practice How wide is the block? 1.000 in. 0.400 in. + 0.002 in. 0.0002 in. 1.4022 in.

Pair Practice Use a LEGO Piece to practice measuring Presentation Name Course Name Unit # – Lesson #.# – Lesson Name Each group pick up a dial caliper. These are precision instruments so use with care and treat with respect. Pair Practice Use a LEGO Piece to practice measuring Length (Outside diameter) Width (Outside diameter) Height of peg (Step measure) Depth of space inside piece. (Depth measurer) Inside space across back of piece (Inside diameter) Approximate measures for a 2x4 block Width of 2x4 block: 0.623” Length of 2x4 block: 1.357” Height of PEG: 0.070 - 0.086” Depth of inside: 0.340” Inside space across back of piece: 0.528”

Dial Caliper Interpretation: Practice Open and read Activity 3.3 Statistic and Quality from the class website. Each Group take 2 cubes, measure and record their values, then pass them down to the next group until you have at least 28 measurements. Measure from end grain to end grain Your task is to complete the measurements today.