Introduction to different gauges
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There are several types of gauges that are used to measure different features of parts and components. Standard gauges are exact copies of mating parts, limit gauges check that dimensions are within upper and lower limits, and plug and ring gauges check that holes and cylinders are within specification. Additional gauges include snap gauges for outside dimensions, taper gauges for tapers, thread gauges for thread profiles, and screw pitch gauges for screw thread pitch. Gauges help to ensure parts and components meet dimensional requirements.
Introduction to different gauges
- 1. Introduction to differentGauges Gauge: An instrumentthatmeasuresandgivesavisual displayof the amount,level,orcontentsof something. The thickness,size,orcapacityof something,especially asastandardmeasure,inparticular. Stander Gauge: If the gauge isan exact copyof matingpart of the componentto be checkeditiscalledstandardgauges. Limit Gauge: Widelyuse forthe checkingthe limitof dimensionsof the partlow limitandhigh limittheyare knowsas Go-Gauge and NOGo-Gauge .Limitgaugesare made to the limitsof the dimensionsof the partto be tested.There are twolimitof dimensions,sowe needtwolimitgauge.‘Gogauge’shouldpassthrough or overa part while ‘NotGogauge 'shouldnotpass throughor overthe part. Plug Gauge: Pluggaugesare simple mechanical inspectioninstrumentsusedtoverifycompliance of threadedorplain holestoupperandlowerdimensional limits.Pluggaugesare designedto“fit”or “notfit” (e.g.Go/No-Go gauge) into holes, etc. Key specifications of limit gauges include the gauge type, gauge function and measurement range. Plug gauges are primarily used as a quick pass/fail test to determine if a hole diameter or thread feature lies within the specified range of acceptance. Ring gauge: Ringgaugesare simple mechanicalinspectioninstrumentsusedtoverifyproductfeature compliance to upperand lowerdimensional limits.Ringgaugesare designedto“fit”or“not fit”(e.g.Go/No-Gogauge)
- 2. overcylindrical features.Keyspecificationsfor ringgaugesinclude the gauge functionandmeasurement range.Ringgaugesare usedas a quickpass/fail testtodetermine if the outside diameterorthread feature of a part lieswithinthe specifiedrange of acceptance. Snap gauge: Snap gaugesare simple mechanical inspectioninstrumentsusedtoverifythatthe outside dimensionsof parts are withintheirspecifiedtolerances.Keyspecificationsinclude features,range,andaccuracy.Snap gaugescan be eitherfixedoradjustable devices.Fixedsnapgaugesare manufacturedtoset measurementswhereasadjustable snapgaugescanbe setto measure overrangesof measurements. Taper gauge: The most satisfactorymethodof testing ataperisto use taper gauges. Theyare also usedtogauge the diameterof the taperat some point. Tapergaugesare made inboth the plugand ringstylesand,in general,followthe same standardconstructionasplugandringgauges.
- 3. Thread gauge: A thread gauge also known as a screw gauge or pitchgauge, is used to measure the pitch or lead of a screw thread. This tool is not used as a precision measuring instrument rather it allows the user to determine the profile of the given thread and quickly categorize the thread by shape and pitch. Feelergauge: Feelergaugesare simplestripsofdimensionallyaccurate shimstockusedformeasuringthe gapsbetween machine elements.Settingautomotivecontactpointsandvalve lashare twoold-schoolexamplesof their use.Insome instancestheyare usedasprecisionassemblyshimstoadjustthe clearancesbetweenmating parts. Theyare oftensoldas sets that increase inthicknessbysome interval suchas 0.001 in. Spark plug gauges are included in this group. Radius and filletgauge: The functionof these gaugesisto checkthe radiusof curvature of convex andconcave surfacesovera range from 1 to25 mm.The gaugesare made in setsof thinplatescurvedto differentradiusatthe ends. Each setconsistsof 16 convex and16 concave blades.
- 4. Indicatinggauge: Indicatinggaugesemployameanstomagnifyhow mucha dimensiondeviates,plusorminus,froma givenstandardtowhichthe gauge hasbeenset.Theyare intendedformeasuringerrorsingeometrical formand size,andfor testingsurfacesfortheirtrue positionwithrespecttoone another.Indicating gaugescan be of a dial or levertype. Screw pitch gauge: Screwpitchgaugesare usedinpickingouta requiredscrew andforcheckingthe pitchof the screw threads.Theyconsistof a numberof flatbladeswhichare cut out to a givenpitchand pivotedina holder.Eachblade isstampedwiththe pitchor numberof threadper inchand the holderbearsan identifyingnumberdesigningthe threaditisintendedfor.