|Mfg SKU #||202-7479|
|Tool Holder Category||Shrink Fit Holder|
|end mill holder style||standard|
|max rpm balanced to||G2.5 25000|
|drawbar thread size||5/8x11UNC|
Curved shrink fit tool holder is designed to achieve minimum interference while staying rigidity at long reach applications, ideally for 5-axis machining. Nose diameter is dramatically reduced compared to a standard shrink fit tool holder to give more accessibility. We optimize our process for both efficiency and accuracy by utilizing Kawasaki robotic arms to load and unload bar stock into the Mazak multi-tasking machine centers. We use JIS# SKD61 (ANSI H13) alloy steel to lay the foundation and case harden to RC 57-59 with a core of RC 34-39 to provide good core strength and maximize wear life. The core creates a dampening effect which reduces vibration in high speed milling to improve surface finish.
The AT3 or better taper accuracy ensures 80% or better taper contact with spindle and using Stotz Air/Electronic Gaging for inspection on the taper. We precision grind the internal bore surface to <.0002" TIR and all bores are ground on a CNC grinder to ensure close run-out tolerance and evenly contact between the collet and the bore pocket. We use Haimer laser balancing machines to deliver a tool that can operate flawlessly at 20000 RPM and Mitutoyo or Mahr indicators to check the run out.
Taper ground to AT3 or better specification ensures 80% or more contact with spindle to reduce harmonics and improve runout tolerance
Inside bore are precision turned to engage a better contact with retention knob's pilot to increase rigidity
Precision turning surface finish provide perpendicular contact with the flange of retention knob to increase rigidity
G2.5 30,000 RPM
In the mindset to minimize the wall thickness, the 0.3056" nose diameter extension nose provides better tool clearance in long reach application.
To achieve 3 micron or better internal bore runout, our internal bore are precision ground on Toyo CNC grinder from Japan. There is not cutting corner on this time consuming internal grinding process and the low runout would contribute to longer cutting tool life and better surface finished.