1811 Stout Dr. P.O. Box 3416, Warminster, PA 18974,  800-824-6374; Fax: 215-675-9465A. Landau Company

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Instructions for Radius Dressing

Developing a good radius depends on the proper diamond tool and the correct radius dressing fixture. There are a great many factors that must be considered in selecting the proper diamond tool –but it is equally important to use the proper dressing fixtures. Every important requirement for good radius dressing is shown below – neglect of any single factor will result in an imperfect radius.

The selection of the proper diamond radius dressing tool depends on your particular job and the type of fixture available. We furnish as standard Cone Point – Chisel Point – and Phonopoint dressers. All these tools are made to your shank specifications and incorporate to a large extent all the features shown below.


Radius dresser

1Diamond must be mounted dead center – an off center point will not dress a true radius and will introduce errors in the dial graduation of the radius fixture.
1The shape of the diamond – Cone, Chisel, etc., must be selected on the basis of the size of the radius to be dressed, and the type of radius dressing fixture available.
1The diamond must have an included angle fitted to the job – too sharp a diamond angle is fragile and subject to breakage – too blunt a diamond angle will not provide adequate clearance. An included angle sharper than 60 degrees is not recommended.
1Diamond must have a sharp point or edge – a flat on the point will not generate a true radius, especially on concave dressing – a broken point will throw the radius off center
2Tool diameter must be held to close limits – a sloppy fit will throw the point off center resulting in poor radius work.


The finest diamond radius dressing tool is worthless if the radius dressing fixture is not in perfect condition. You must check your radius dressing fixture for the following.

1. Fixture must be rigidly mounted on the grinder and be of heavy enough construction – a loose fixture or one too light for the job will chatter, breaking off the diamond or producing a wavy radius.

2. Fixture movement must be smooth and free – not too tight – a stiff fixture will produce a jerky movement in swinging the radius, causing the diamond point to dig in and produce a wavy radius.

3. Fixture must have no play or backlash in the gibs, diamond holding device, overarm, or rotation bearings. Any play will show up on the radius, producing an elliptical rather than a true round radii and throwing off the center location.


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