NC5 TOOLING SYSTEM Solid Taper with Dampening Effect (not hollow Shank)
Innovational Design! Double Contact ・ 1/10 Short Taper Since the launch of the NC5 TOOLING SYSTEM at JIMTOF'94, OSAKA the system has proven its outstanding ability is a wide cross-sector of Japanese Industry, with ever-increasing expectation of its being adapted as the Next Generation Tooling Interface. Please take a moment to look at the NC5 TOOLING SYSTEM before you purchase your next machine. P.213 ～ 226 NC5 is an abbreviation of New Century arbor with 1/10 taper （ 5 ° 43' 29" ） .
1/10 and 7/24 Taper The following diagrams show the correlation between Pulling Force/ Taper Angle and their Static Stiffness. As can be seen, using the same Pulling Force, the smaller the Taper Angle, the greater the Static Stiffness. Therefore, the larger the Taper Angle, the greater the Pulling Force is required. For example, 12KN of Pulling Force is required for a 7/24 taper to obtain the same value of Static Stiffness as a 1/10 taper using a 4KN Pulling Force.
Inclination （ 10 -4 rad ）
1/10 Short Taper
Thrust F= 1 KN
Flange Contact
P=2KN P=4KN P=8KN P=12KN
200 mm
3.0
Pulling Force P （ KN ）
Drive key
2.0
E.H.Merritt's Theory Chattering Stability =
Unique Construction : Considering of a slotted taper cone which is pre-loaded by a disc spring to increase its vibrational dampening effect whist adjusting minute gauge-line errors, completely.
0
1.0
5°
10°
15°
Static Stiffness × Damping Ratio Thus, the advantage of NC5 TOOLING SYSTEM is clearly demonstrated.
Deflection
1 / 10
7 / 24
Taper angle
Pulling Force and Static Stiffness The NC5-63 takes advantage of the taper/Pulling Force to increase its Static Stiffness such that under a force of 5.5 KN the Static Stiffness of an NC5-63 and BT40 are almost the same. But at 12KN the Static Stiffness of an NC5-63 is three times that of a BT40.
Photo is used the taper cone with RPT treatment.
Repeatability Higher Repeatability is accomplished due to run-out accuracy of contact flange for taper is within 0.002mm.
Y
Y
Deflection
（ μ m ）
Z
X
Thrust F= 1 KN
BT40
200 mm
100
L
Pulling Force P （ KN ）
NC5-63
Repeatability
50
TAPER Equivalent
L
X Y Z
NC5- 46
0
70 0.003 0.003 0.003 0.003 120 150 180
0.003 0.003 0.003 0.003
0.002 0.002 0.002 0.002
BT30 BT40 BT45 BT50
4 6 8 10 12 15 Pulling Force （ KN ）
- 63 - 85 -100
Deflection
means Deflection of Test Bar itself.
ATC
Clamp Action … Cleaning Air is same as Unclamp Action.
① When tool is inserted into a spindle, there is no contact between the taper or flange.
③ Further retraction causes simultaneous contact of the taper and the flange with spindle.
② Taper makes contact and centres.
Unclamp Action
⑤ Flange is detached slightly and high pressure air blast cleans the flange.
④ As the pull stud is released, an air blast is activated inside the spindle.
⑥ Taper is detached and air blast cleans the taper.
213
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