Get Out the Gauge. Step 1 Place the bore gauge in a micrometer locked to the same diameter of the hole being measured. When working with sheet metal, the term “gauge” is often used. Step 2 Rotate the indicator's dial until the pointer aligns with the "0" marking on the dial face. So, for example, if the pointer is just barely below the point of hitting the fourth line between the 0 and the 10 on the dial, you might estimate and write down a measurement of 3.9. 4. Slip gauges are the universally accepted ‘standard of length’ in industries. It’s pretty simple. Re: Proper use of a "dial test indicator" (DTI) vs. dial indicator (DI)? For comparison, 1 in.-Hg equals 25.4mm-Hg, or about 3.4 kPa. A dial indicator(DI) can be used at any angle if you are strictly testing concentricity. Dial indicators typically measure ranges from 0.25 mm to 300 mm (0.015in to 12.0in), with graduations of 0.001 mm to 0.01 mm or 0.00005in to 0.001in (imperial/customary). Gague are used to specify the thickness of a metal sheet. Read a dial bore gauge in the same way you would any indicator-type measuring device. DL1 Load Meter SM1000D - Extensometer (DTI-2) Load, F Gauge Extension, Δl (s) (kN) (mm) Time Digital Scale (DTI-1) Overall For this review, we'll stick to in.-Hg, or simply inches of vacuum. If you want to know that you are actually measuring the numbers on the dial, then you need to use it perpendicular to the surface being measured. The Dial Test Indicator has an arm […] Remember, one full revolution of the dial equals to 1 mm. Gague (Ga.) is a length measurement unit for diameters originating in North America and belongs to the Browne & Sharpe metering system. View Lab A Data -Aluminium.xlsx from MAAE 2202 at Carleton University. each "indicator reading - calibration tool reading". Next, gather the reading from the dial indicator’s dial. Subsequently, you can see100 divided lines on the face of the dial indicator to provide you with a resolution of 0.01 mm per line. Step 1: Measure the ambient temperature and record it. Read the manual and follow all instructions. If the temperature is <18oC or >24oC, see the Division Manager for further instructions. ・Use for any purpose other than measuring may damage or wear the instrument. Some also show the modern metric scale of kilopascals (kPa). Always note the spec on the gauge face to be certain you read the hash marks correctly. ・Use of product other than as described in the manual may cause accident. Slip gauges were first developed by Johnson, and sometimes also called as ‘Johnson Gauge Blocks’. Use only as indicator Gauge. Dial Test Indicators & Dial Indicators (DTI, Dial Gauge, Digital Dial Indicator, Digital Dial Gauge) First, what’s the difference between a Dial Indicator and a Dial Test Indicator? The best way to estimate is to gauge how close the pointer is to each line. The Dial Indicator has a plunger and reads how far the plunger is raised by the surface below. (2) For an indicator of 0.002 mm graduation: Displace the contact point so as to move the pointer clockwise in increment of 0.02 mm with reference to the graduations from the zero point to the end point of the measuring range while taking readings of the calibration tool at each Most vacuum gauges are graduated in inches of mercury (in.-Hg) and millimeters of mercury (mm-Hg). Use a conversion factor of 25.40 mm/in to convert gauge block lengths to Metric from Imperial . These are rectangular blocks of steel having a cross-section of about 32 mm x 9 mm. This one only indicates .050-inch per revolution and because it is a rod bolt stretch gauge, almost all of your reading will fall between the 5 (.005-inch) and 10 (.010-inch). ... How to Read mm on a Ruler. 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