WIDIA - Полный каталог инструмента - 2017
для размещения заказа - zakaz@widiahanita.ru
Technical Information
TopThread™
American Buttress (7° Pressure Flank Leading) NTB-A Inserts • Push Type
chuck
anti-clockwise
rotation
feed
NTB-2RA
NTB-3RA
NTB-4RA
7° pressure flank
of the thread being
the leading flank
external buttress
7° pressure flank leading
Reference Dimensions
chuck
anti-clockwise
rotation
feed
NTB-2LA
NTB-3LA
7 NTB-4LA
7° pressure flank
of the thread being
the leading flank
internal buttress
7° pressure flank leading
Insert vs. Toolholder Orientation
external
internal
7
NTB-2RA
NTB-3RA
NTB-4RA
seating
surface
in toolholder
insert
notch
seating
surface
in bar
insert
notch
NTB-2LA
NTB-3LA
NTB-4LA
Infeed Angle vs. Chip Load: 7° Pressure Flank Leading
“A” reference
nose radius
D maximum
depth with “A”
style insert
.0039"
chip load
.010" infeed
.010" infeed
.0052"
chip load
.0012"
chip load
.007" chip load
15 infeed angle
feed direction
insert
NTB-2A
NTB-3A
NTB-4A
D
(inch)
.133
.171
.218
“A” ref.
(inch)
.024
.031
.049
nose radius
(inch)
.002–.004
.005–.008
.008–.012
pitch based on
maximum radius
16–20 TPI
8–16 TPI
NOTE: For balanced chip load, 15° infeed angle is suggested.
NTB-A insert
Internal Threading Limitations
0 infeed angle
feed direction
internal threading limitations
NTB-2A Buttress threading inserts
internal threading limitations
NTB-3 and NTB-4A Buttress threading inserts
TPI
nominal
minimum minor
TPI
nominal
minimum minor
thread size
diameter
thread size
diameter
(inch)
(inch)
8
1-3/4
1.600
10
1-5/8
1.505
12
1-1/2
1.400
16
1-1/4
1.175
20
1-1/16
1.002
4*
2-1/2
2.200
5
2-1/4
2.010
6 2 1.800
8
1-3/4
1.600
10
1-5/8
1.505
12**
1-1/2
1.400
*NTB-4A insert only.
**Can cut 16 or 20 threads per inch provided minor diameter is 1.375" or larger.
Threads per Inch vs. Maximum Root Radius Chart (Inch)
TPI
maximum root radius
20 16 12 10 8 6 5 4 3 2-1/2 2 1-1/2 1-1/4 1
.0036 .0045 .0059 .0071 .0089 .0119 .0143 .0179 .0238 .0268 .0375 .0476 .0572 .0714
NOTE: Special Buttress forms are available upon request.
zakaz@widiahanita.ru
www.widiahanita.ru
F95