Why do Drill Bits Break?

Having the right drill bit in the right application can make the toughest job a breeze. Here are few reasons your drill bits might be breaking and how we recommend you go about your drill jobs to avoid broken bits.

A standard drill bit can be manufactured in many ways, but most commonly and economically is stamped or crimped to form the twist or flute. The point and cutting edges are then ground for the correct size and application. That method is where accuracy is not as important as just getting a hole in the material. On the other hand, machine grade tools are made for precision applications, where accuracy and repeatability are most important. Machine grade tooling is turned, ground flat, and incorporates features that deliver the precision and accuracy required for the application. Machine grade tools are made from high quality metals like cobalt or carbide. Micro-points are added so the tooling stays on track. Cutting edges are ground at complex geometries demanded by the hardest of materials, including titanium, boron, extra-strength, and case-hardened steels, most of which are encountered in exhaust manifold bolt repairs.

We recommend applying a small amount of drilling and tapping fluid to any heavy-duty drilling job. This will reduce the amount of torque and resistance your bit meets when drilling the initial pilot hole.
Another staple in any one of our drill applications are drill bushings. Drill bushings are mounted to an alignment fixture can be the difference between success and a costly failure. Threaded mounting bushings are most common in machine shops because of their superior accuracy.

A threaded mounting bushing incorporates a proprietary and precision machined edge that mates to an opposite edge in the tool which overrides the threads to bring the assembly into perfect alignment with the cylinder head. Threaded mounting bushings will assure perfect alignment and perpendicularity of tooling. How the tooling system is used will determine repair times and the quality.
Not all drill bit designs are made equally. Using a bit with the right flute volume will allow the buildup of chips to be expelled as you move your drill in and out of the drill hole.
Using machine grade tooling and following the above steps will ensure productive and efficient repairs that will boost productivity and keep your customers’ cars safe and running at peak performance.
Be sure to check out our ProDrill series of bits, bushings and taps - all precision engineered to cut through the hardest materials with speed and accuracy.

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