Wiper Insert

What is a Wiper Insert?

What is a Wiper Insert?

The wiper insert is designed with a short, flat edge that is located where the straight edge meets the corner radius.

In comparison to conventional breakers, the surface finish is maintained even if the feed rate is doubled.

Machining at high feed rates improves cutting efficiency.

• Improving Surface Finish Roughness
Under the same machining conditions against conventional breakers, but with the feed rate increased, the surface finish of the workpiece can be maintained.

• Improving Efficiency
High feed rates not only shorten machining times but employing a wiper also makes it possible to combine roughing and finishing operations.

• Increased Tool Life
When wiper inserts are employed, the high feed rate possible reduces the time in cut therefore, delaying the progression of wear and increasing insert tool life.

• Improving Chip Control
Under high feed conditions, the chips generated become thicker and are more easily broken, thus, chip control is improved.

What is a Wiper Insert? 2

The Estimation of finished surface roughness when using a wiper insert

The estimate of finished surface roughness when using a wiper insert

Wipers are effective when external machining, boring and facing.

* The surface roughness when machining at corner R or taper angle over 5°, is same quality as machining with the standard inserts.

Special attention is not necessary when using CNMG • WNMG • CCMT types

No Restriction for Holder

No Restriction for Holder

The standard holder can be used as it is.
(* The double clamp, highly rigid holder is recommended.)

No machining program adjustment necessary

Not Necessary to Adjust the Machining Programme
The conventional machining program can be used as it is.
(The CNMG • WNMG • CCMT types are based on ISO/ANSI standards.)

Special attention is necessary when using the DNMX • TNMX types due to the special top face geometry

Restriction for Holder

Use a holder with an end cutting angle of 93°to improve wiper efficiency. A holder with a cutting edge angle of 91°can marginally improve wiper efficiency (see the figure below), however, there is no wiper efficiency with other end cutting angles (60°, 90°, 107°etc.).

Necessary Adjustment of the Machining Program

If dimensional errors occur, please adjust machining program to compensate for insert nose configuration.
(The DNMX • TNMX types are not based on the ISO/ANSI.)

Necessary to Adjust the Machining Programme

Machining program adjustments for DNMX and TNMX inserts

A) Turning and facing


B) Machining a form or taper

Required to machine an accurate form or taper.
Move the tool perpendicular to the machined surface.

(Note) Adjust the drive-in angle toward the normal line when the part where the adjust number in minus (θ=60° - 70°) is not machined completely.

Machining a form or taper



C) Compensation when machining a corner radius

1) Tool path adjustment method

Machine the correct form by altering the tool path corner radius.
Programmed corner radius = Part print (P/P) corner radius + compensation factor.


2) Nose radius adjustment method

Machine the correct form by altering the insert nose radius value in the machine program.
It is not necessary to alter the tool path when using this method however, a dimensional error of up to +/- .0012" may occur.


(Note) The correction value is the same for both DNMX and TNMX inserts. Discriminate between them only by the different nose radius.

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