In the machining of automotive wheel hubs, the bolt hole needs to have a smooth surface finish with minimal concentricity. To ensure this, generally a drill operation is followed by a reaming operation with a chamfer tool to remove the entry burr.
The drill design is specialized to prevent the chip from damaging the surface of the bore hole
Due to the effects of heat generation while machining, the bore surface will undergo strain-hardening leading to poor press fitting of the hub bolts. Apollo drills are designed to produce minimal heat while machining by customizing the point geometry and guide pads
Customized cutting edge design provides equal forces throughout the cutting edge lip improving hole stability and reducing tool deflection
Advanced tool design leads to superior chip breaking properties resulting in excellent chip evacuation and superior surface finish quality
By maintaining close tolerances while manufacturing, Apollo drills produce holes with minimal oversize eliminating the requirement of an expensive reaming operation.
With the addition of a step diameter, the chamfer operation removes the entry burr, reducing the need of an additional tool and thereby saving valuable machining time and tooling cost