机加工（英文）加中文化对照

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1、原文MachiningTurningEngineLathesTheenginelathe，oneoftheoldestmetalremovalmachines，hasanumberofusefulandhighlydesirableattributes．Todaytheselathesareusedprimarilyinsmallshopswheresmallerquantitiesratherthanlargeproductionrunsareencountered．Tolerancesfortheenginelath

2、edependprimarilyontheskilloftheoperator．Thedesignengineermustbecarefulinusingtolerancesofanexperimentalpartthathasbeenproducedontheenginelathebyaskilledoperator．Inredesigninganexperimentalpartforproduction，economicaltolerancesshouldbeused．Theenginelathehasbeenrep

3、lacedintoday’sproductionshopsbyawidevarietyofautomaticlathessuchasturretlathes，automaticscrewmachines，andautomatictracerlathes．TurretLathesProductionmachiningequipmentmustbeevaluatednow，molethaneverbefore，intermsofabilitytorepeataccuratelyandrapidly．Applyingthisc

4、riterionforestablishingtheproductionqualificationofaspecificmethod，theturretlathemeritsahighrating．Indesigningforlowquantitiessuchas100or200parts．itismosteconomicaltousetheturretlathe．Inachievingtheoptimumtolerancespossibleontheturretlathe，thedesignershouldstrive

5、foraminimumofoperations．AutomaticScrewMachinesGenerally，automaticscrewmachinesfallintoseveralcategories；single-spindleautomatics，multiple-spindleautomaticsandautomaticchuckingmachines．Originallydesignedforrapid，automaticproductionofscrewsandsimilarthreadedparts，t

6、heautomaticscrewmachinehaslongsinceexceededtheconfinesofthisnarrowfield，andtodayplaysavitalroleinthemassproductionofavarietyofprecisionparts．Quantitiesplayanimportantpartintheeconomyofthepartsmachinedontheautomaticscrewmachine．Quantifieslessthan1000partsmaybemore

7、economicaltosetupontheturretlathethanontheautomaticscrewmachine．Thecostofthepartsmachinedcanbereducediftheminimumeconomicallotsizeiscalculatedandthepropermachineisselectedforthesequantities．AutomaticTracerLathesSincesurfaceroughnessdependsgreatlyuponmaterialturne

8、d，tooling，andfeedsandspeedsemployed，minimumtolerancesthatcanbeheldonautomatictracerlathesarenotnecessarilythemosteconomicaltolerances．Insomecases．tolerancesofa