Обший каталог Yamawa 2016 - 2017 - страница 703

Flowchart : M2 tapping
Check 1
PD
Boring before tapping
PD


Engagement ratio on cutting taps


Engagement ratio on roll taps
Internal threads
Min
Min 100%
100%
Max 74.1%


Internal threads
M2


Internal threads
Ta
ps

M3
Min Max Ta
ps
Length of
Length of engagement
Max engagement=3.1mm 74.1%
On "middle" engagement class, 7H class can be chosen
in case of "L" engagement length. Internal threads made by roll taps are M4
Engagement Internal threads
different from those made by cutting Ta
taps on the shape of minor dimameter. ps
Symbol


classification
Middle
Coarse


Unit : mm
Engagement
Fine


Unit : mm
d=2.0mm


Engagement
length External threads D1
length classification Drill size Min
*Hole size for thread forming taps
(ref.) Max M5
S Short engagement length 4H 5H — S 1(mm) Min Max Ta
M Normal engagement length 5H 6H 7H 1 M 3(mm)
Bored hole size 1.6 1.567 1.679
1.79 1.84
ps
L Long engagement length 6H 7H 8H 3 L(mm)
Engagement ratio 92.4% 100% 74.1% Forming condition changes depending
P=0.4mm D1 is minor diameter of JIS 6H(2nd Class) of internal threads on workpiece's Material and shape.
Above is for customer's reference. M6
Ta
ps

Tolerance area of tap's pitch diameter M8
Thread class of cutting taps Ta
ps
【Pitch diameter】
Diameter of imaginary cylinder or cone Internal threads Class PD tolerance
ISO2 21μm〜36μm
Check 2


which makes equal the width of threads
M1
Ta 0
and width of space between the threads
ISO2X 36μm〜55μm ps
*Above shows the plus tolerance
ISO2 by setting PD basic size as "0".
ISO2X M1
Ta 2
ps
Width of
threads Thread class of roll taps
Width of space
width Class PD tolerance M1
between threads Ta -M7
ISO2X 51μm〜64μm ps
Pitch
Threading


diameter ISO3X 64μm〜76μm
ISO2X *Above shows the plus tolerance M9
by setting PD basic size as "0". Ta -M2
ISO3X ps 4

Basic size of pitch diameter
M2
Ta 5-M4
1.740mm
-150μm -100μm -50μm +50μm +100μm +150μm ps 8
For
ISO2X ISO3X ← Roll taps thr Unifi
e e
6g Ta ads d
p s
Tolerance of dies is the ISO2 ← Cutting taps
target of external threads
ISO2X For
W
Class of dies thre hitwo
a r
Ta ds th
6g Solid dies 6g external threads(-86〜-19) 6H internal threads(0〜90) ps
NR GR GP NP
For
P
Ta ipe thre
ps ads
Relative position of PD tolerance area of external threads, internal threads, taps and gages.
For
P
Ta g thre
(–) ← Basic size of pitch diameter → (+) ps ad
s
1.740mm
Unit : m Unit : m
Check 3


Ring gage pitch diameter (for external threads inspection) Plug gage pitch diameter (for internal threads inspection)
NR6g -96 〜 -86 GR6g -22 〜 -12 GP6H 2 〜10 NP6H 90 〜 98
Gage check


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 1.886〜1.981 1.654〜1.721 − 6H − 1.740〜1.830 1.567〜1.679


Sizes-2
699