Обший каталог Yamawa 2016 - 2017 - страница 705

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Flowchart : M3 tapping Boring before tapping Check 1 Engagement ratio on cutting taps PD Engagement ratio on roll taps PD Internal threads Min 100% Min Max 74.1% 100% Internal threads Internal threads MTa2ps Min Max MTa3ps Max Length of 74.1% Length of engagement engagement=4.6mm On "middle" engagement class, 7H class can be chosen Internal threads made by roll taps are in case of "L" engagement length. MTa4ps Engagement Internal threads different from those made by cutting Symbol classification Middle Coarse Unit : mm taps on the shape of minor dimameter. Fine Engagement Unit : mm Engagement length d=3mm External threads D1 length classification Drill size Min Max *Hole size for thread forming taps S Short engagement length 4H 5H S 1.5(mm) (ref.) Min Max MTa5ps M Normal engagement length 5H 6H 7H 1.5 M 4.5(mm) Bored hole size 2.5 2.459 2.599 2.75 2.82 L Long engagement length 6H 7H 8H 4.5 L(mm) Engagement ratio 92.4% 100% 74.1% Forming condition changes depending P=0.5mm D1 is minor diameter of JIS 6H(2nd Class) of internal threads on workpiece's Material and shape. Above is for customer's reference. TMa6ps Tolerance area of tap's pitch diameter TMa8ps 【Pitch diameter】 Thread class of cutting taps Diameter of imaginary cylinder or cone Internal threads Class PD tolerance Check 2 which makes equal the width of threads ISO2 24μm〜 40μm and width of space between the threads 39μm〜 55μm MTa1p0s ISO2X ISO2 *Above shows the plus tolerance by setting PD basic size as "0". ISO2X MTa1p2s Width of threads Thread class of roll taps Width of space Class PD tolerance MTa1ps-M7 between threads ISO2X 64μm〜 76μm Threading Pitch ISO3X 76μm〜 89μm diameter ISO2X *Above shows the plus tolerance TMa9ps-M24 ISO3X by setting PD basic size as "0". Basic size of pitch diameter -150μm -100μm -50μm 2.675mm +50μm +100μm +150μm MTa2p5s-M48 6g ISO2X ISO3X ← Roll taps FtThaorpresUadnsified Tolerance of dies is the ISO2 ← Cutting taps target of external threads ISO2X Class of dies FtThoarrepWasdhsitworth 6g Solid dies 6g external threads(-95〜-20) 6H internal threads(0〜100) NR GR GP NP Relative position of PD tolerance area of external threads, internal threads, taps and gages. FToarpPispe threads ( ) ← Basic size of pitch diameter  → (+) FToarpPsg threads 2.675mm Unit : m Unit : m Check 3 Ring gage pitch diameter (for external threads inspection) Plug gage pitch diameter (for internal threads inspection) Gage check NR6g -105 〜 -95 GR6g -23 〜 -13 GP6H 2 〜10 NP6H 100 〜 108 NR : NOT GO ring gage GP : GO plug gage GR : GO ring gage NP : NOT GO plug gage Unit : mm Unit : mm Accuracy of external threads Accuracy of internal threads Major diameter Pitch diameter Minor diameter Major diameter Pitch diameter Minor diameter 6g 2.874〜2.980 2.580〜2.655 − 6H − 2.675〜2.775 2.459〜2.599 Sizes-4 For improvement, spec may change without advance notice. 701