Dual-clamping method POINT
Dual chucking by Hydraulic & Mechanical
Only high rigidity & high clamping power can prevent the end mill from being pull-out and can prevent chattering.
SHOWA has solved the so-called “wooden pestel phenomenon”
which causes the pulling out of end mill, by clamping the cutting tool’s shank nose & shank end.
“Vibration” caused by chattering is removed by the attenuation mechanism of hydraulic and spring.
“Wooden pestel phenomenon”
Test cut with Hy-Dual chuck and conventional milling chuck in the same program
Comparison of surface roughness
● Holder in use : BT50-HDU20-100(HY-DUAL CHUCK)
● Cutting tool : Six flutes Cemented carbide endmill
● Work materials : SKD61
● Cutting condition
Ap: 30mm, Ae: 1mm, Rotational speed: 1900min-1
Feeding rate: 1920mm/min, Tool projection: 55(L/D=2.75)mm