Step Drill Chamfers, Drills in One Operation, Saving Time
Emuge’s EF step drill is a high-penetration rate solid carbide drill that can chamfer and drill in one operation, saving time.
Emuge’s EF step drill is a high-penetration rate solid carbide drill that can chamfer and drill in one operation, saving time. It also provides a more accurate hole-to-chamfer location and improves hole preparation for tapping or thread milling. The tools feature a double-margin design on the minor diameter for round threaded hole size. Web construction is adjusted for each diameter to improve chip evacuation efficiency.
The EF step drill stock program includes a range of sizes from 2.8 to 15.5 mm minor diameter, UNC/UNF (No. 6-32, 0.625" to 11"), M/MF (M3 to M18) and a full range of sizes in 2×D and 3.5×D lengths. Tools have a coolant-through, four-margin design with TiAIN-T14 coating. They can cut a range of materials and are available in cut or form thread diameters.
Running rotary milling cutters at the proper speeds and feeds is critical to obtaining long tool life and superior results, and a good place to start is with the manufacturer's recommendations. These formulas and tips provide useful guidelines.
You know how to machine metals, but what about plastic machining? More specifically, glass-fiber-reinforced plastic? This machine shop has it figured out.
Cutting holes by interpolating a face milling cutter may be a better process choice for many rough and even finish boring operations. Software improvements and better cutter designs allow expanding use of the versatile face mill for hole making.