Tooling Line Enables Trepanning on a Mill
IMTS 2018: Thinbit’s Mill A Groove line of toolholders and inserts consolidate operations and provide quality finish for sealing surfaces.
Manufactured by Kaiser Tool Co., Thinbit’s Mill A Groove toolholders and inserts are designed to trepan on a CNC mill.
According to the company, capability for quality finish makes the tools ideal for sealing surfaces. Other advantages include the elimination of secondary lathe operations for face grooving; a large cross-section that provides strength, and the availability of custom inserts to match the groove form. In addition, groove diameters are concentric to spindle rotation, not table movement.
The inserts do not rotate about their own centers, so the groove can be symmetrical or asymmetrical. Step grooves, convex and concave radius grooves, chamfered edges, angles and special profiles can be made with a single insert.
When machining in 6061 aluminum, the line cuts a groove 0.125" wide × 0.200" deep × 4.98" in diameter in 18 seconds.
The toolholders are designed to work in combination with boring heads and are available in common sizes with straight and 90-degree orientations.
Inserts are available from 0.004" through 0.150" in 0.001" increments. Major diameters start at 0.300". Inserts are available in sub-micron grain carbide grades for ferrous and non-ferrous materials and HSS for composites and plastics. Inserts can be coated with TiN, TiCN, TiAIN or diamond film. PCD and CBN tipping options are available for hard or abrasive materials.
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.
The more common twist drill point geometries often are not the best for the job at hand. By choosing the best point for the material being drilled, it is possible to achieve better tool life, hole geometry, precision, and productivity.
Fast CNC processing and high-pressure coolant contribute to removing metal at dramatic rates. But what should a shop know about cutting tools in high speed machining?