Muab faib raws li qhov tshwj xeeb lossis qhov loj me, cov qauv iav tau muab faib ua tus qauv thiab tsis yog-tus qauv;
Sib txawv ntawm cov ntsuas hauv tsev thiab txawv teb chaws, cov qauv iav tau muab faib ua ob hom: pej xeem thiab British system.
Public iav qauv
Lub hauv paus system feem ntau yog siv rau pej xeem / modulus (M / m), thiab tus naj npawb ntawm cov iav modulus=txoj kab uas hla ntawm lub voj voog sib cais ÷ tus naj npawb ntawm cov hniav=sab nraud ntawm lub iav ÷ (tus naj npawb ntawm cov hniav ntxiv 2).
Cov qauv tseem ceeb ntawm pej xeem iav yog: M{{0}}.4 m0.5 m0.6 m0.7 m{{1{ {12}}}}.75 m0.8 m0.9 m1 M1.25 m1.75 m2 m2.25 m2.75 m3 m3. 3
British iav qauv
DP iav yog British iav (inch iav) siv nyob rau hauv Tebchaws Europe thiab Tebchaws Meskas thiab lwm lub tebchaws. Nws yog hais txog tus naj npawb ntawm cov hniav ntawm txoj kab uas hla ntawm txhua nti faib ntawm txoj kab uas hla. Qhov loj dua tus nqi, tus hniav me dua. Datoma DP=Z/D (Z -tooth naj npawb, D -sib nrug txoj kab uas hla, nti), nrog txoj kab uas hla DP unit (1/in). Nws muaj tib txoj kev sib raug zoo nrog pej xeem system M=25.4/dp, uas txhais tau hais tias nws yog tib yam li peb feem ntau siv modulus.
Cov qauv tseem ceeb ntawm cov iav British yog: DP1 DP1.25 DP1.5 DP1.75 DP2 DP2.25 DP2.75 DP3 DP4 DP4.5 DP7 DP7 DP8 DP10 DP14 DP16 DP16
