Double Sided Insert Type Shoulder Mill



High Rigidity and High Quality Performance

The “X-Type” insert shape achieves both high quality

The insert’s main cutting edge can machine a 90° wall surface. Additionally, the large R-wiper edge is adopted for achieving a good surface finish, while, the optimized “X-type” with 6 corners contributes to lower tool costs.

The generous thickness of the insert provides high rigidity.

Discover excellent fracture resistance and high rigidity made possible via the thick (.354”/9mm) insert pocketed on 3 sides and secured with a large M5 screw offering robust clamping.

Excellent control and chip abrasion prevention.

Utilizing CAE*, the main cutting edge design was developed with a twisted cutting edge and a convex rake angle resulting in an optimal shape that provides excellent chip formation and evacuation greatly suppressing the scattering of chips at the bottom and periphery surface of the tool leading to high wall accuracy, a superior surface finish and markedly improved efficiency.
*CAE : Computer Aided Engneering


Comments from Developer

The WWX400 was developed under the concept of “Stable and Worry-free” using an optimized insert shape with a maximum thickness of .354”/9mm in response to recent trends of unmanned operations and the demand for increased efficiency. The main attributes improved were rigidity and fracture resistance. Attention was also given to the cutting edge shape to achieve improved finished surface quality and good chip discharge. Be sure to experience the proprietary “X-type” insert developed by Mitsubishi Materials.

The optimized insert support and high clamp rigidity

The conical shaped seating surface widely supports the insert surface area, while the arched insert support provides necessary clearance to suppress body damage from scratches and chip abrasion. Additionally, the strong clamping force of the M5 screws prevents loosening to provide robust clamping.


Low cutting resistance suppresses chatter vibration even

Although a double-sided insert type with an axial rake angle of 9°(close to that of a single-sided insert type) is used, the WWX400 insert achieves lower cutting resistance than a single-sided insert (MMC comparison) and suppresses chatter vibration when machining thin workpiece materials.


Variety of cutter types, diameters & pitches.

Increasing the insert thickness, while achieving seat-less clamping made it possible to incorporate a large number of teeth while maintaining large chip pockets to provide a variety of cutter options. A standard inventory is maintained consisting of 3 pitch types of both arbor and shank type cutters of same diameter.Fine pitch types in particular allow a high table feed and greatly improve efficiency.

Comments from Developer

The result of pursuing “worry-free” is our cutter body. The highly rigid arching insert support achieves a stable installed feeling by using a conical shaped seat and the M5 screws. This design allows for long use and is the answer to the dissatisfied customers who have experienced “when damage to the insert has also made the cutter body unusable.”

MP6100/MP7100/MP9100 Series

TOUGH-Σ Technology
A fusion of the separate coating technologies; PVD and multi-layering provides extra toughness.


CVD Coating MC5020

First recommendation for cast iron milling.MC5020 has excellent wear resistance and also controls thermal cracking and chipping that are common when machining ductile cast iron.

Black Super-smooth Coating
Black super-smooth coating prevents abnormal damage such as weld chipping.


Chip Breaker System


Cutting Performance

AISI 4140 Finished Surface Comparison

WWX400 M class insert achieves the good surface finish as well as conventional G class product.


AISI 4140 Fracture Resistance Comparison

High stability is achieved without fracturing even at a feed of fz=.014 IPT.


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