Multi-Function Cutter Prevents Chipping in Spot Drilling
Big Kaiser has introduced two versions of the C-Centering Cutter, a multifunction cutter capable of spot drilling, centering and chamfering.
Big Kaiser has introduced two versions of the C-Centering Cutter, a multi-function cutter capable of spot drilling, centering and chamfering. It is an indexable cutter that uses a specialized insert that can start a hole from a solid piece. It can also perform spot drilling and 90-degree chamfering at the same time, or it can be used strictly for hole chamfering.
During spot drilling, the insert-nose radius can be easily chipped with general cutters since the center has a peripheral speed of zero. But the coolant hole in the C-Centering Cutter enables cooling of the cutting edge, which reaches high temperatures during spot drilling and enables immediate chip evacuation. This prevents chipping during spot drilling.
The latest version of the C-Centering Cutter is a three-insert cutter, which is only used for chamfering. This version is perfect for general chamfering and results in a reduction of cycle time over using the single-insert version.
The recipe for best results is simple: Start with a rigid machine, add a high pressure through-the-spindle coolant system, then combine these with the right drill geometry plus the right speeds and feeds.
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.
One of the most common methods of tapping in use today on CNC machines is 'rigid tapping' or 'synchronous feed tapping.' A rigid tapping cycle synchronizes the machine spindle rotation and feed to match a specific thread pitch. Since the feed into the hole is synchronized, in theory a solid holder without any tension-compression can be used.