|Mfg SKU #
|collet size range
- ER-EM collet does not have a collapse range, unlike the standard ER collet does - Nominal size of ER-EM collet covers the most popular end mill shank size in both inch and metric size- ER-EM collet naturally seats deeper into the pocket to reduce the un-supported overhang. -This design improves cutting tool's rigidity and clamping force which would increase end mill's tooling life performance - ER-EM collet is capable to fit into the standard ER tool holder
Made from SUJ2 alloy steel from Japan which is equivalent to AISI 52100 and hardened to HRC 46-48
Internal bore and the 2 taper surfaces are precision ground in a CNC grinder Shigiya from Japan to roughness tolerance of Ra 0.4
An ER collet is selected during the CNC grinding process to check the 2 taper contact surface's accuracy
We optimize our manufacturing workflow for both efficiency and accuracy by utilizing robotic arms to load and unload ER collet stock into the Shigiya CNC grinders which are made in Japan. Combining the robotic arms with a reliable CNC grinder is our formular to control tight tolerance in a mass production environment.
Each collet is inspected 3 times at 0, 120, and 240 degree at 4 times diameter to guarantee the 5 micron (0.000197") runout tolerance. This inspection process is also repeated 3 times with fully disassemble collet from the collet nut and the tool holder to guarantee consistent runout tolerance