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Rotary Burr

How to Fabricate a Carbide Burr with Lathe

Carbide burrs are a type of rotary file that are fitted to a drill. They are used to deburr metal tools and surfaces.

A carbide burr consists of a round shank and a larger round carbide sleeve that is soldered onto the round shank. You can purchase a blank carbide burring tool and install the knurling onto the carbide to turn the blank into a functioning tool. A burr has sharp ridges cut into the carbide and when placed in a drill or other rotary tool, you can use the carbide end to grind away material such as metal wood or plastic. To turn a tool blank into a functioning carbide tool, you need a knurling tool and an engine lathe.

1 Secure the blank in the lathe of your milling machine according to the manufacturer's instructions.

2 Place the spindle speed of your engine lathe between 50 and 100 RPMs via the speed adjustment lever and then set the feed rate to the slowest rate possible via the feed rate adjustment lever.

3 Grip the shank of the tool blank in the jaws of the spindle and then tighten the jaws with the spindle wrench.

4 Place the knurling tool in the turret on the lathe and then place the tips of the knurling tool’s rollers against the side of the carbide. Position the knurling tool so the tips of the rollers rest flush against the side of the carbide and then tighten the bolts on the turret with the turret wrench.

5 Turn on the lathe and then engage the feed lever to automatically feed the turret forward. The knurling tool will move across the length of the tool blank and leave deep knurled grooves in the carbide. Pull up on the lever to stop the automatic feed once you knurl the entire surface of the carbide tip.

6 Disengage the fluting cutter, then remove the finished
carbide burrs
from the mill.

Burrs (the tools) are also used in CNC machining centers for removing burrs (the small flakes of metal) after a machining process.These tools usually spin at several thousand RPM. Because the cutting edges are so small, they can be touched when spinning by a finger without cutting the skin, which flexes out of the way, although it would not be safe to pinch or grip them from two sides. Hard metal or ceramic workpieces cannot flex beyond the cutting edges, so the tools remove material from them. This characteristic makes them suitable for dentistry, as the tool will grind the hard enamel of teeth, yet leaves soft mouth tissues unharmed if the tool should erroneously touch them.

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