ALTERATION GUIDE FOR STEPPED CENTER PINS
Merchandise product
Merchandise product
Changes
Code
Contents
Changes
Code
Contents
Alteration
Alteration
Dowel hole boring E Available when flange diameter ≧ 4
Precision flat cutting
Dowel hole boring
＋ 0.1
Precision single flat cutting Designation range (DorP)/2 ≦ VKC ＜ H/2 E Only high speed steel SKH51 is applicable Precision two flats cutting Designation range (DorP)/2 ≦ VWC ＜ H/2 E Only high speed steel SKH51 is applicable
0 d
Designation method NC
VKC
X Combination expect for NHC/NHN/CX/RX/SR/AC/AGC/RR not available
NC
T d ℓ 4 2 3 6 3 5 8
－ 0.02 0
VKC
When aligning the flange cut with the surface position
T
of Shaft diameter (One-step / Two-step type) Retention diameter (Stepped type)
Precision flat cutting
Dowel hole boring + Spring pin hammering E Available when flange diameter ≧ 4
Dowel hole + Spring pin
Designation method NCW
VWC
d
X Combination expect for NHC/NHN/CX/RX/SR/AC/AGC/RR not available
T d ℓ 1 4 2 5 6 3 8
NCW
－ 0.02 VWC 0
KC
Flange cutting
T
One-Step/ Two-Step Center Pin
Designation unit • One-step / Two-step
Single flat cutting Designation range (DorP)/2 ≦ KC ＜ H/2
Numbering on the head Electrolytic marking method is used to insert the text that identifies the details on the head. (Round-Gothic font of about 1.8 mm) Designation characters 10 kinds of Arabian numbers (0 – 9), and 26 Alphabets (A – Z) Designation range A single character when 2 ≦ H ＜ 4.9 Two or less characters when 5 ≦ H ＜ 6.9 (only the first character shall be the alphabet) Three or less characters when 7 ≦ H (the number of alphabets can be up to 1) Designation method NHC–6 NHC–23 NHC−A90 E Available when flange diameter H ≧ 2 X In some cases, the processing is not possible if the back of the flange cannot accommodate the character size of 1.8 in length x 1.8 of width. Automatic sequential numbering on the head Automatic sequencing method is preferred to carry out numbering on the head when multiple center pins of the same size are ordered in a single shipment.
KC
Fixed shaft diameter type (D/2) …………… 0.05 mm unit is allowed Shaft diameter 0.01 mm designation type (P/2) … 0.005 mm unit is allowed Shaft diameter 0.1 mm designation type (P/2) … 0.05 mm unit is allowed • Stepped type (D/2) ……………………… 0.05 mm unit is allowed
Numbering
－ 0.1 KC 0
Flange cutting
A 1 3
NHC
Two parallel flats cutting Designation range (DorP)/2 ≦ WKC/2
WKC
3
Stepped One-Step/ Two-Step Center Pin
Designation method • VKC2.82
(For P5.64) (For P6.75) (For P5.22) (For P6.17) (For P5.48)
－ 0.1 WKC 0
• VWC3.375
• KC2.61
• WKC3.085 • RKC2.74
Flange cutting
Varied width parallel two flats cutting Designation range (DorP)/2 ≦ KAC KAC ＜ KBC ＜ H/2
KAC KBC
• DKC3
(For D6) (For D3)
Numbering
• KGC1.5-AG125
KAC － 0.1 0
－ 0.1 0
Designation characters Same standard as NHC (see above) Designation range Same standard as NHC (see above) Designation method When three items are ordered with NHN-1
• KTC3.085
(For P6.17)
KBC
1
2
3
Flange cutting
NHN
Sequential numbers starting from 1, 2, 3 are added on the head. When 10 items are ordered with NHN-A15 Sequential numbers starting from A15, A16, A17 ・・・ A23, A24 are added on the head.
Two flats (right angled) cutting Designation range (DorP)/2 ≦ RKC ＜ H/2
One-Step/ Two-Step Center Pin
RKC
A1
A2
A3
To designate arbitrary flat cutting
E Available when flange diameter H ≧ 2 E Only available when two or more pieces of identical size are ordered. X In some cases, the processing is not possible if the back of the flange cannot accommodate the character size of 1.8 in length x 1.8 of width. The angle can be specified in the range of 30° ≦ AC ≦ 60° with standard Ks=45°. Designation range Designation unit 1° unit 30° ≦ AC ≦ 60° Designation method AC40 Step Machining limit for D A+2 (C×tanAC°) ＜ (DorP) X Combination with RR not available (Except two-step) E Available when C ≦ 1.0 E Tapered center pins are not applicable The angle can be specified in the range of 30° ≦ AGC ≦ 60° with standard Ks=45°. Designation range Designation unit 1° unit 30° ≦ AGC ≦ 60° Designation method AGC60 Step Machining limit for D J + 2 (G × tanAGC°) ＜ V X Combination with RR not available E Tapered center pins are not applicable
－ 0.1 0
RKC
Flange cutting
Three flats cutting Designation range (DorP)/2 ≦ DKC ＜ H/2
One-Step / Two-Step Center Pin Stepped One-step/ Two-step
DKC
AC °
KC Designation unit 0.1 mm unit Designation method: • VKC1.4 • VWC2.3 • KC1.4 • WKC2.3
Stepped One-Step/ Two-Step Center Pin
0
DKC
DKC － 0.1
AC
° AC
Center pin Step C Step D
Flat (angled) cutting
Aside from reference surface (0°) angle of the flange cut can be designated. Designation range (DorP)/2 ≦ KGC ＜ H/2 AG = Designation 1 ゜ unit 0 ゜＜ AG ＜ 360 ゜
AG °
± 0.5
KGC
0 °
Two-step center pin Stepped two-step
• KAC1.4-KBC1.6 • RKC1.4 • DKC1.75 • KGC1.4-AG85 • KTC2.3
KGC
° AGC
AGC
Flat (angled) cutting
center pin Step C Step D
120 °
Three flats cutting at 120° Designation range (DorP)/2 ≦ KTC ＜ H/2
120 °
KTC
120 °
One-Step / Two-Step Center Pin Stepped One-Step/ Two-Step Center Pin
RR
RR
0
－ 0.1 KTC
Changes R (normally 0.2 or less) to R0.3–0.5 (for Strength improvement) E R dimensions cannot be specified
5C
5B
Makes the flange diameter shorter. Designation range DorP ≦ HC ＜ H and DorP ≧ 1.5
RR
Changes the flange diameter
Designation method RR E Step Applicable to B/C/D E DorP−A ≧ 1.0 E Step For D, C ≧ 0.5
RR
Step B Step C Step D
HC
5D
0.1 mm unit
Designation unit
E In relation to the diameter tolerance, alteration may create a straight piece with little diameter difference between the head and shaft.
Designation method HC6.5
Performs C chamfering on the tip.
Designation unit
0.1 mm unit
CX ± 0.1
Designation method CX0.5
Designation range 0.3 ≦ CX ≦ 0.5 E α＝ CX V(E) is a dimension prior to CX machining. E Available when DorP ≧ 2 Performs R chamfering on the tip. Designation range (DorP) ≦ 4.5 c 0.3 ≦ RX ≦ 0.5 E α＝ RX (DorP) ＞ 4.5 c 0.3 ≦ RX ≦ 1.0 V(E) is a dimension prior to RX machining. E Available when DorP ≧ 2 Finishes the tip in spherical shape (SR). E α＝ V/2 V(E) is a dimension prior to SR machining. E Available when DorP ≧ 2 E Tapered center pins are not applicable
CX
Changes the flange diameter (precision)
Makes the flange diameter shorter. (Precision) Designation range DorP+0.5 ≦ HCC ＜ H−0.3 and DorP ≧ 1.5
HCC
Two-step center pin
E Tapered center pins are not applicable
E CX ＜ V/2 or E/2
Designation unit
0.1 mm unit
Designation method HCC6.1
RX ＝ 0.1 mm unit
Designation unit
RX ± 0.1
Designation method RX0.5
RX
The flange thickness is shorter than the standard. Dimensions L, Y, F, N remains unchanged Designation range T/2 ≦ TC ＜ T E T−TC ≦ Lmax.−L E DorP ≧ 1.5
Changes the flange thickness
Stepped One- Step / Two-Step Center Pin
E Tapered center pins are not applicable
E RX ＜ V/2 or E/2
TC
Designation unit
0.1 mm unit
TC
Designation method SR
Designation method TC3.5
SR
T
SR
E Note that when the alteration dimension specified for the flange cut is (H/2-0.15) or more, there will be almost no flat surface on the flange.
287
288
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