Sumitomo Electric Hardmetal Rigid polygon shank toolholder series provides high bending and torque moments
UK – Sumitomo has launched a series of highly rigid polygon shank toolholders for both negative and positive insert types.
This results in hardened shank and insert seating that will then extend the life of the toolholder, the company says.
The series includes general turning, copying, and facing on both turn-mill and machining centres. Its stiffness and conical polygon shape provide high bending and torque moments which are also enhanced by its face contact with the spindle, Sumitomo adds.
The company explains that the self-guiding coupling of the monoblock system has precise levels of repeatability within ±2µm in the X, Y and Z-axes. Its rigid D-type double clamping is used on the negative insert type enabling precise indexing and seating of the insert. The use of carbide shims reduces damage to the holder and an internal coolant feed enables flow supply directly to the cutting edge of the insert. Head diameter to length ratios are 40 mm by 50 mm, and 50 mm by 60 mm. For the DNMG negative insert it's 40 mm by 55 mm, and 50 mm by 60 mm.