Criteria for Bilz-cone size selection:
The Bilz-cone-fixing connects tool and holder positively. That means, the transmittable torque depends on the cone diameter, respectively the Bilz-cone size. As the cutting-torque depends primarily on the cutting width and also on the material and cutting data, the biggest available Bilz-cone size should be chosen for heavy loads.
When machining with limited space in the workpiece, attention must be paid to the holder outer-diameter. In such cases a smaller cone diameter should be selected to ensure that the holder diameter is smaller than the tool diameter. This improves the chip flow too.
Features of the Bilz-cone connection:
The Bilz-cone shank in combination with the Bilz-cone collet of the holder is a tight intersection with a high run-out-accuracy. It is particularly appropriate for drilling and boring operations, in which the cutting forces, especially the thrust tightens the link between tool and holder. For heavy oscillating radial loads (milling, counter boring with one-sided cut without pilot), the cone-connection is less suitable. Tool and holder can be assembled simply without using a mounting tool. The tool can be disconnected from the holder by using an extractor. For this it is fed into the cross hole of the holder until it touches the extractor tang of the cone shank. By turning the extractor, the tool is moved forward and disconnected from the holder.
The lean design of the Bilz short-cone holder is a special advantage over intersections with straight shank, locked by a side lock screw, like Weldon and Whistle Notch. Thus it is possible to combine conterbores with smaller holders.