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Precision Sheet Metal Workshop Precision Hand Measurement Tools

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3/18/2016 Precision Sheet Metal Workshop Precision Hand Measurement tools What are the necessary hand tools? Squares and square blades Calipers Radius gauges Protractor Tape measurer Micrometers Feeler Gauges Rules “The decimal place matters!” .900 .090 .009 1 3/18/2016 Scales… You want a 16R blade! 16R blades measure tenths! Measuring with a square Measure plus or minus Set an inch long, “Measuring with a square Another way of measuring an inch long!” 2 3/18/2016 “And yet another… measure from one end, scribe a line and do the same from the other end!” Blades can be stacked for length If it’s a quality blade. Measuring with a square “Set the square to the apex dimension, match the bottom corners with a straight edge!” 3 3/18/2016 Combining tools to make measurements Using your square blade and calipers to check edge to hole. Checking square During the run, watch! But verify! “And yet another check Use the part itself” 4 3/18/2016 Radius gauges Radius gauges measure radii, inside and out. If we can match the gauge to the radius and the radius matches the calculations... We get a valid bend deduction and perfect finished part! No radius gauges? “Measure radii with gauge pins” Half the Diameter Drop the pin in the bend… …check the radius! 5 3/18/2016 Calipers - the uses the Tips Measure off the Back the Jaws or the Stinger Calipers - Vernier We’re talk’en Old School here But, they’re just as accurate as Digital's Calipers - Vernier Fiftieths in the center. Thousandths on the slide. 6 3/18/2016 Calipers - Vernier Find where the lines “line-up” and add: The inch, the hundredths and the thousands for the answer! One inch, five hundred and fifty thousands + fifteen thousands or... 1.565 Dial and Digital Runs on a gear track Electric scale Cleaning dial calipers “Wipe Brush Light oil Stroke Wipe again” 7 3/18/2016 Zeroing calipers Vernier: most are fixed. Dial: Zero by adjusting dial. Digitals: push the button zero anywhere. Zeroing Dial Calipers “A pin down the hole in top or a flat copper on the rack are used to jump the calipers Jumped tooth back.” “.005 difference between the top and bottom.” Adjusting lash in head 8 3/18/2016 Calibrating Most of the time it’s no more than tightening the top screws! Using the calipers correctly The calipers frame can’t move at all. Don’t use sliding jaw for gauging, flexing from mechanical clearance may be to great. Checking the tips “With a Dial caliper you will need to zero the hole diameter.” Get a Gauge Zero on a hole Check the caliper 9 3/18/2016 “You can do much more than just measure distance …” It’s square ! It’s Parallel ! Parallelism and checking for square “No square needed here… …Dude!” Micrometer Scale Main thumb Measuring Tips screw Body Measuring force Lock thumb screw 10 3/18/2016 Zeroing the Micrometer Gauge… It should zero… but doesn’t here. Zeroing the Micrometer Get the Spanner wrench.. Find the hole… “Don’t forget to loosen the set screw” Move the scale. Zeroing the Micrometer Zero scale With the gauge in place “Don’t forget to re-tighten the set screw” 11 3/18/2016 Protractors “Direct reading, Vernier and Digital They’re all here!” The standard protractor Close enough for a +/- one degree part Vernier protractor “Plus or Minus 5-minutes accuracy!” 12 3/18/2016 Protractors… for more than parts Half the angle + half the springback Finds the correct bend angle… first try! Feeler Gauges “Listen here sonny-boy they’re useful” The height gauge and surface plate “When it needs to be perfect!” 13 3/18/2016 Accurate measurements Every time! Height gauges and Dial indicators “Check variations from part to part, plus or minus” Center finders One, two, three block Find center. Read dimension from zero. 14 3/18/2016 Jigs and fixtures Jigs and fixtures are nice... But planning and skill cancels the need Using a fixture it does… or, it doesn't fit ! Tape measure With time even you will be able to get the most from a tape measurer! 15 3/18/2016 “What is the proper way to reference item #1 for measurement ?” “Some say like this Some say like that So, which is it ?” “Notice anything ? How about now ? And now ?” 16 3/18/2016 You get a bad measurement here Reference here You get a valid measurement Reference here “Pay attention, look close, use a straight edge if necessary” 17 3/18/2016 Conclusion: “Proper interpretation of the blueprints coupled with the knowledge of measurement devices means… … Perfect parts every time!” 18.
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