Обший каталог Yamawa 2016 - 2017 - страница 718

M 8 加工フロー
Flowchart : M8 tapping
Check 1
PD PD
Boring before tapping


Engagement ratio on cutting taps


Engagement ratio on roll taps
Internal threads
Min
Min 100%
100%
Max 80.4%


Internal threads
Internal threads
M2s
p
Ta


M3s Max
Tap Min
Length of
Length of engagement
Max engagement=12.1mm 80.4%
74.1%
On "middle" engagement class, 7H class can be chosen
in case of "L" engagement length. Internal threads made by roll taps are
M4s Engagement Internal threads
different from those made by cutting
taps on the shape of minor dimameter.
Tap
Symbol


classification
Middle
Coarse


Unit : mm
Engagement
Fine


Unit : mm
d=8.0mm
Engagement
length External threads D1
length classification Drill size *Hole size for thread forming taps
(ref.) Min Max
M5s S Short engagement length 4H 5H — S 4(mm) Min Max
Tap M Normal engagement length 5H 6H 7H 4 M 12(mm)
Bored hole size 6.8 6.647 6.912 7.36 7.49
L Long engagement length 6H 7H 8H 12 L(mm)
Engagement ratio 88.7% 100% 80.4% Forming condition changes depending
on workpiece's Material and shape.
P=1.25mm D1 is minor diameter of JIS 6H(2nd Class) of internal threads Above is for customer's reference.
M6s
Tap

Tolerance area of tap's pitch diameter
M8s Thread class of cutting taps
Tap 【Pitch diameter】
Diameter of imaginary cylinder or cone Internal
internal threads Class PD tolerance
ISO2 38μm〜63μm
Check 2
Check 2


which makes equal the width of threads
0 and width of space between the threads
M1ps ISO2X 63μm〜88μm
Ta
*Above shows the plus tolerance
ISO2 by setting PD basic size as "0".
ISO2X
2
M1ps Width of
Ta
threads Thread class of roll taps
Width of space Class PD tolerance
7 between threads
-M ISO2X 102μm〜114μm
M1Taps Pitch
Threading


diameter ISO3X 114μm〜127μm
ISO2X *Above shows the plus tolerance
24 ISO3X by setting PD basic size as "0".
-M s
M9 Tap
Basic size of pitch diameter
48 7.188mm
5-M s
M2 Tap
-200μ
-200μm -150μ
-150μm -100μ
-100μm -50μ
-50μm +50μ
+50μm +100μ
+100μm +150μ
+150μm +200μ
+200μm

d ← Roll taps
ifie ISO2X ISO3X
Un s 6g
For threadps
Ta Tolerance of dies is the ISO2
target of external threads ← Cutting taps
ISO2X
rth
two Class of dies
Whi ds
For threa s 6g Solid dies
pTa 6g external threads(-146〜-28) 6H internal threads(0〜160)
NR GR GP NP
s
h read
ipe t ps
For P Ta Relative position of PD tolerance area of external threads, internal threads, taps and gages.

ds
hrea
Pg t Taps (–) ← Basic size of pitch diameter → (+)
For
7.188mm
Unit : m Unit : m
Check 3


Ring gage pitch diameter (for external threads inspection) Plug gage pitch diameter (for internal threads inspection)
NR6g -160 〜 -146 GR6g -37 〜 -23 GP6H 7 〜 17 NP6H 160 〜 170
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 7.760〜7.972 7.042〜7.160 − 6H − 7.188〜7.348 6.647〜6.912


Sizes-17
714 Codes shown in ( ) are available while supplies last.