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Bur and Flute Recommendation for Various Materials

                                           Flute (Cut) Descriptions
                           Standard Flute Angle is 30 Degrees Right Hand

Aluma (Mill) Cut -Very wide flutes. Quick chip flow. Used on Plastics and non- ferrous metals. Very Coarse.

Standard Cut -Medium Flute coarseness. Good stock removal. Does a good job on blending and finishing. General purpose.

Coarse Cut- Wider spaced flute pattern. Rapid removal where finish is not a factor. For use on softer metals.

Fine Cut- Close spaced flute pattern. Minimal removal. Best Finish is obtained from this cut. 

Second Cuts
(Can be put on burs with fine, standard or coarse cut)

Diamond Cut- A back cut (left-hand) equal to 80% or more of the number of flutes in the first cut. Used for fine tool control and to reduce chip size from grinding almost to a powder.

Double Cut- A back cut (left hand) equal to 40-60% of the number of flutes in the first cut. Used for tool control and to break the chips from grinding into small slivers.

Chipbreaker Cut- Minimal depth crosscut flutes almost perpendicular to the shape of the bur cutting surface. Used for good tool control and to break up the chip size From grinding.

Material

Flute Pattern Recommendation

Aluminum

Aluma (Mill) Cut

Brass

Aluma (Mill) Cut or Standard Double Cut

Bronze

Standard Double Cut

Copper

Aluma (Mill) Cut or Standard Double Cut

Fiberglass

Router Cut

Cast Iron

Standard Cut

Malleable Iron

Coarse Cut / Chipbreaker

Inconel

Standard Double Cut

Lead

Aluma (Mill) Cut

Magnesium

Aluma (Mill) Cut

Plastics

Aluma (Mill) or Standard

Alloy Steel

Standard Double Cut

Carbon Steel

Standard Double Cut

Stainless Steel

Standard Double Cut / Deep Flutes

Titanium

Standard Double Cut

Zinc

Aluma (Mill) Cut or Standard Double Cut


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