Mahr - Product Catalog Página 183
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Dial Indicators per ANSI/AGD Selecting a dial indicator Since modern manufacturing involves a wide range of tolerances. choosing a dial indicator might be difficult, especially since the number of indicators available is so vast. The following guidelines were prepared to assist you in selecting the right model for your application. If your tolerance spread is .006"(±.003"), then, the most suitable minimum graduation value is .0005". Consider four characteristics when selecting a dial indicator: • Minimum Graduation Value — value of the smallest graduations marked on the dial. From several different values available from Mahr, select the one which is closest to 10% of the tolerance spread of the work you are measuring. This assures that the tolerance will span about ten divisions of the dial. • Size — represents the bezel diameter. Make your selection on the basis of space available for the indicator and the distance from which it will be viewed. The Indicator photograph shown on the first page of each ANSI/ AGD Group is full scale. Simply place the page which illustrates the Indicator at the expected viewing distance, and choose the size that offers you the best readability and is the proper size for your fixture. Mahr's "C" size bezels (ANSI/AGD Group 2), which have a diameter of 2-1/4”, are the most popular. • Range per Revolution — represents the distance the spindle travels with one complete revolution of the dial hand. From the dials available in the size and minimum graduation value you choose, select the range per revolution which allows the tolerance spread to occupy 1/10 to 1/4 of the dial. • Total Range — the maximum distance over which the indicator spindle can travel. Usually, this represents 2-1/2 revolutions of the hand, which is adequate for most needs. Sometimes, however, this may not be adequate for your application and a special total range may be necessary. Copies of the current ANSI Standard for Dial Indicators (ANSI B89.1.1 0-1987) are available from: The American Society of Mechanical Engineers ASME Order Desk 22 Law Drive Fairfield, NJ 07007 (973)882-1167 Your tolerance spread is .006 ". You have chosen an ANSI/AGD Group 2 (Mahr “C” Size) dial with a minimum graduation value of .0005". Mahr offers four indicator types in this size and minimum graduation value. Of these, type C5M has a range per revolution of .030" which is about midway between your tolerance extremes. You selected a C5M indicator. Your total range, however, needs to be at least .200" so the spindle can clear the lip of your part. But, the longest range available in the C5M indicator you need is only .075". Special ranges up to .400" are available for this indicator type. Select the closest range for your application (for Model C5M, you would select .250"). If the range you need is not listed under the “Special Ranges” category, contact Mahr. Chances are we can supply the range you need. Dial Types 3. Continuous clockwise. Normally furnished on Long and Extra Long Range Indicators, unless otherwise specified. Indicates an increasing value when contact is depressed as in direct-reading thickness gages. 1. Balanced (+) on right. Normally furnished on all Group 0, 1, 3 and 4 ANSI/AGD indicators only, unless otherwise specified. Indicates an increasing value when contact is depressed as in comparison type OD. snap and bench thickness gages. Note: With Revolution Counter models, counter dial numbered counterclockwise. Note: If Revolution Counter models are ordered, counter dial numbered counterclockwise. 4. Continuous counterclockwise. 2. Balanced (+) on left. Indicates decreasing values when contact is depressed as in comparison bore* and depth gages. Indicates a decreasing value when contact is depressed as in direct reading slot, recess or hole depth measurements. Note: With Revolution Counter models, counter dial numbered clockwise. Note: If Revolution Counter models are ordered, counter dial numbered clockwise * Will vary as dictated by motion transfer design. MarCator | Dial and Digital Indicators 179
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