An under-shank type now available
New century
Antivibrated undershank endmill
An undercut type has been added to the popular general-purpose end mill series "New Century". This is variable pitch and variable leads type.
![UNDERSHANK ENDMILL (3).png](https://www.cominix.jp/tc/labo/idea/assets/UNDERSHANK%20ENDMILL%20%283%29.png)
Product feature
Interference with the shank can be avoided when machining walls and deep grooves.
![名称未設定のデザイン (1).png](https://www.cominix.jp/tc/labo/idea/assets/bc2071ac985860c491d7cfe4a829e548e2ae744c.png)
![① (1).png](https://www.cominix.jp/tc/labo/idea/assets/ba09bdb26c78ed5145b2a8f07058690c9bac03ae.png)
An R shape is provided to prevent the bite of the edge (tool scratch and steps) due to a slight tilt of the tool when machining a depth longer than the cutting edge length.
Cutting edge dia. line up: Φ5~Φ13
Type: 4NV-US (Square) and 4NV-USR (Radius)
![名称未設定のデザイン (2).png](https://www.cominix.jp/tc/labo/idea/assets/252c75331ab658e7360a77554af32a621e33b4ca.png)
test datea
Product code: 4NV-US-10.0 (Cutting edge dia.: Φ10/ Shank dia.: Φ8)
Cutting condition: Vc=120m/min S=3,820rpm F=610mm/min fz=0.04mm ap=10
We verified how much we need to reduce ae (Radial depth of cut) as the tool protrusion becomes longer.
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Machine
Mazak VCN-430A(BT40) -
Workpiece clamping condition
Workpiece material: S50C
Overhang amount: 30mm
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Machining with overhang amount of 3D.
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ae=4mm, No vibration
The surface is smooth under the condition of ae=4mm and overhang of 3D.
Overhang amount: 40mm
![7.png](https://www.cominix.jp/tc/labo/idea/assets/f9039c7e6b588e70a3eaaf493713ca3b87f10634.png)
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ae=2mm, Occurred vibration
In the case of about 4D overhang, vibration occurred even if it was decreased to ae=2 mm.
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ae=1.5mm, No vibration
By reducing the radial direction to ae=1.5 mm, vibration was eliminated.
Overhang amount: 50mm
![8.png](https://www.cominix.jp/tc/labo/idea/assets/7a8961934748be911bb092f1354f9e2ae3d34ae2.png)
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ae=1mm, Occurred vibration
With overhang of 50 mm (5D), vibration was occurred even with ae=1 mm.
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ae=0.5mm, No vibration
By reducing the radial direction to 0.5mm, vibration was suppressed.