Общий каталог Yamawa 2022 - 2023 - страница 974

Flowchart : M4 tapping PD PD Boring before tapping Engagement ratio on cutting taps Check 1 Engagement ratio on roll taps Min Internal threads Min 100% 100% Max 76.3% Internal threads M2s Internal threads p Ta M3s Ta p Min Max Max Length of engagement=6.1mm 76.3% 【Length of engagement】 Internal threads made by roll taps are M4s On "middle" engagement class, 7H class can be chosen in case of "L" engagement length. different from those made by cutting p Internal threads Ta Engagement Unit : mm taps on the shape of minor dimameter. Symbol Middle Coarse classification Engagement D1 d=4.0mm Fine Unit : mm Engagement length External threads length classification Drill size Min Max *Hole size for thread forming taps M5s (ref.) S Short engagement length 4H 5H − S≦2（mm） Min Max Ta p M Normal engagement length 5H 6H 7H 2＜M≦6（mm） Bored hole size 3.3 3.242 3.422 3.65 3.72 L Long engagement length 6H 7H 8H 6＜L（mm） Engagement ratio 92.4% 100% 76.3% Forming condition changes depending P=0.7mm D1 is minor diameter of JIS 6H(2nd Class) of internal threads on workpiece's Material and shape. Above is for customer's reference. M6s p Ta Tolerance area of tap's pitch diameter 【Thread class of cutting taps】 M8s Class PD tolerance T ap 【Pitch diameter】 P2 20μｍ〜40μｍ Diameter of imaginary cylinder or cone Internal threads P3 40μｍ〜60μｍ Check 2 which makes equal the width of threads 0 and width of space between the threads M1ps Ta P4 60μｍ〜80μｍ P2 P5 80μｍ〜100μｍ P3 2 M1ps P4 *Above shows the plus tolerance by setting PD basic size as "0". Ta Width of P5 threads 【Thread class of roll taps】 Width of space Class PD tolerance .5 between threads M8 s - p M1 Ta G6 64μｍ〜76μｍ Pitch Threading diameter G6 G7 76μｍ〜89μｍ 24 G7 G8 89μｍ〜102μｍ -M s M9 Tap G8 *Above shows the plus tolerance by setting PD basic size as "0". Basic size of pitch diameter 48 -200μm -150μm -100μm -50μm 3.545mm +50μm +100μm +150μm +200μm 5-M ps M2 Ta Ⅱ G6 G7 G8 100 0-M s P1 P2 P3 P4 P5 M5 Tap Tolerance of dies is the P2 target of external threads nifi ed Class of dies 6g external threads(-112〜-22) 6H internal threads(0〜118) r U ads Fo r e s NR GR GP NP t h Ta p Ⅱ Solid dies P1 Solid dies JIS 2Class external threds(-112〜-22) JIS 2Class intenal threads(0〜118) h ort itw Wh ds P2 for Auto Lathe WR GR GP WP For threa s p Ta Relative position of PD tolerance area of external threads, internal threads, taps and gages. ed ds us threa es crew hin For S ing mac ） e w on s s（S p M (–) ← Basic size of pitch diameter → (+) Ta 3.545mm ds rea Unit : μm Unit : μm e th ps Pip Ring gage pitch diameter (for external threads inspection) Plug gage pitch diameter (for internal threads inspection) For Ta Check 3 NR6g -126 〜-112 GR6g -31 〜-17 GP6H 2 〜 10 NP6H 118 〜 126 can eri WRⅡ -112 〜-104 GRⅡ -34 〜-26 GPⅡ 4 〜 12 WPⅡ 110 〜 118 Gage check Am ds For threa s e pip Ta p NR : NOT GO ring gage GR : GO ring gage GP : GO plug gage NP : NOT GO plug gage WR : NOT GO working ring gage WP : NOT GO working plug gage ure iat Unit : mm Unit : mm Min ds For threa s p Accuracy of external threads Accuracy of internal threads Ta Major diameter Pitch diameter Minor diameter Major diameter Pitch diameter Minor diameter 6g 3.838〜3.978 3.433〜3.523 − 6H − 3.545〜3.663 3.242〜3.422 JIS 2class 3.838〜3.978 3.433〜3.523 〜3.119 JIS 2class − 3.545〜3.663 3.242〜3.422 Sizes-10