Precision Tools

Swiss Precision Since 1961 

"Our production is up and tool cost is down.  The COFA tool made a big difference on this part."

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How Does It Work?

Controlled by a simple spring, the carbide cutting blade follows the contour of the hole’s surface removing all burrs while creating an even tapered corner break. The blade does not cut as it passes through the bore and will not damage the hole’s surface. The edge break begins only at the point where the blade makes contact with the material and then tapers the hole’s edge. This allows for faster feed rates since the tool slows itself down as it enters the through hole. 

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COFA

The Universal Deburring Tool

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  • Specifically designed for front and back deburring on even and uneven bore edges using CNC machinery
  • Perfect for a range of cross hole deburring applications including sloped bores
  • ID/OD deburring
  • No stopping or reversing the spindle
  • Even and consistent edge break
  • Suitable for all ranges of machine materials
  • Available in smaller sizes for micro-deburring applications
  • Coated carbide blades guarantee a long tool life and faster feeds and speeds
  • Typical applications include forks, yokes, common rails, castings, tubes with cross bores, and other work pieces with cross bores in main bores 

 

 Available from stock for immediate delivery in sizes
from 2 mm to 41 mm (0.090" to 1.614")
Cassette option available for larger hole sizes 

Cofa deburring tools catalog

How Do I Order a COFA Deburring Tool?

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1. Choose the tool that best fits the hole diameter. You can use our Tool Selector for assistance.
2. Choose the blade that best fits the hole geometry.
3. Choose the spring that best fits the material.

 View Application Data Sheet 

Questions? Contact Your Local Agent

 

COFA Case Study

Eliminating Manual Deburring of a Steering Column Component

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Challenge:

A precision machining subcontractor to the automotive industry used to deburr a fork laboriously by hand. The fork is part of the steering column. Faced with the problem that the manual deburring was too time-consuming and that it became a bottle neck in the production process, the company set out to look for a new solution.

deburring application on a steel steering colunm

Application details

  • Bore-Ø: 15.0 mm
  • Deburr size: max. 0.3 mm
  • Material: Steel
  • Machine: Hermle Milling Center
  • Machining: axially
  • Cooling: external cooling, 30 bar pressure
  • Dimensions: d = 15.0 mm, H = 42.0 mm, E = 28.0 mm
  • Production volume: 200,000 bores per year
drawing of a COFA deburring tool

Solution

The deburring of the fork piece is a regular application of the COFA tool. The customer's requirement to reduce the process time as much as possible led to a special solution although the diameter of 15.0 mm could be easily deburred by a standard COFA tool. In order to be able to work with a maximal work speed HEULE proposed a double-cassette-tool. As the name implies it works with two blades at the same time.

Tool: Double-cassette-tool COFA C6
Blade: C6-M-0006-T

Machining parameters:

  • Speed: 1000 rev./min.
  • Feed: 0.8 mm/rev.

 

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Results

As explained by the customer, the main benefit is the now process capable chamfer as well as the replacement of the manual secondary work and the resulting time gain.The machine operator is overjoyed that he no longer needs to manual debur the part. 

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