By using these intermediate length WTX co-pilot drills after an initial 3xD pilot hole has been created, the optimum conditions are generated to deploy WTX deep-hole drills (up to 50xD).
To ensure correct point alignment with the deep-hole drill, the point-angle geometry of WTX co-pilot drills has been set at 137°, with either four or six facets, which is 3° less than the pilot drill and 2° greater than WTX deep-hole drills. WTX co-pilot drills are also toleranced to j6 to create the correctly sized pilot hole to provide clearance for the following deep-hole WTX drills, which are toleranced at h7 and fg6.
The productivity gains are generated from the elimination of the need to peck holes up to 20xD for the WTX co-pilot drills, and the eradication of pecking at up to 50xD when followed up with the WTX deep-hole drill. Process security is also enhanced, as is tool life.
WTX co-pilot drills are available in a range of diameters between 3 and 9 mm, and are suitable for materials in the P, M and K categories for steel, stainless steel and cast iron.
