A composite bit or drill having a material working section adhesively connected to an enlarged gripping section. The material working section includes generally a cutting, grinding or finishing portion and continuous therewith a shank portion and is made of hard, abrasion resistant, heat resistant, durable alloys. The gripping section has a relatively large mass and large outer diameter with respect to the material working section and has an accurately formed longitudinal bore therein for receiving the shank of the material working section the adhesive connection between the material working section and the gripping section will not prevent heat transfer between these elements. Adhesive materials for connecting the cutting section to the gripping section may be anaerobic adhesives, epoxy adhesives, cyanoacrylate adhesives and other compounds depending on the bond strength required and the heat transfer characteristics established between the material working section, the gripping section of the bit and the chucking means for holding the composite bit or drill. Additionally, for forming a composite bit or drill there is provided a gripping element or jacket having a longitudinal bore formed to receive drills or the like type tools within a predetermined range of sizes to permit the bit or drill to be fitted and adhesively connected in the bored jacket elements in any type of work shop where such tools are used.
This invention provides a drill, drilling apparatus, and methods for their use, in which a plastic shank of uniform external diameter is molded onto one end of an insert made of hard drill material. The end of the insert which is encompassed by plastic has dimensions and configurations designed to prevent axial and rotational slippage of the insert inside the plastic shank when the drill is in use. The unattached end of the insert is provided with a cutting tip and drilling flutes. High speed automatic drilling and drill-changing operations are described in which a number of drills having different flute diameters, but uniform shank diameters, are used consecutively.
Dental anchoring means of the kind including a threaded pin which is located in a hole in a tooth. Before insertion into the hole, the pin is integral with a shank through a neck which allows the pin to break off from the shank after insertion. The pin and shank are located in a longitudinal open-ended bore in a connecting member which is arranged to be secured in a dental handpiece. The pin and shank are fixed in the bore by forming an enlarged head on the shank which is a force fit in the bore. This locks the pin and shank securely in the bore during use and the connecting member can be of different material from the shank and pin.
A composite drill bit comprising a shank member having a bore disposed therein and an insert which is disposed within the bore such that a portion of the insert protrudes from the shank member. The insert is rigidly secured within the bore of the shank member through the use of an ambient cure adhesive.
A composite drill bit comprising a shank member having a bore disposed therein and an insert which is disposed within the bore such that a portion of the insert protrudes from the shank member. The insert is rigidly secured within the bore of the shank member through the use of an ambient cure adhesive.
A boring bar includes a shaft and a head which carries a cutting insert. The head includes a conical protrusion which fits in a correspondingly shaped recess of the shaft and is secured therein by an adhesive joint in order to damp vibrations.
