(orstartofchamfercircle)deter-(cF)istheradialdepthofinvoluteprofilebeyondthedepthofengage--tricitiesbetweentheminorcircle(internal),themajorcircle(external),(DFe,DFi)-tionparalleltothereferenceaxis,alsoincludingparallelismandalignmentvariations().Note:Straight(nonhelical)(Lq)(m)(toothtipcircle)(Do,Dri)-cleoftheexternalsplineortheinsidecircle(toothtipcircle)(Dre,Di),().Pitch(P/Ps)binationnumberofaone-to-tworatioindicatingthesplinepropor-tions;theupperorfirstnumberisthediametralpitch,thelowerorsecondnumberisthestubpitchanddenotes,asthatfractionalpartofaninch,thebasicradiallengthofengage-ment,(D)
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