Material & Heat Treatment
Crafted from premium low-carbon alloy steel (such as 20CrMnTi) and subjected to overall carburizing heat treatment. This provides high surface hardness and wear resistance while maintaining exceptional core toughness to withstand the shocks and vibrations of high-speed cutting.
High-Precision Manufacturing
The inner taper and outer diameter undergo multi-stage precision grinding processes, achieving a taper tolerance of AT3 or higher. This ensures a perfect fit and high concentricity (typically runout less than 0.005mm–0.01mm) between the tool holder and spindle, as well as between the collet and tool.
Dynamic Balance Performance
Engineered for high-speed rotation (typically up to G25.0 at 12,000–20,000 RPM or higher). Rigorous dynamic balancing tests are conducted prior to delivery to minimize centrifugal runout during high-speed machining, thereby extending the service life of both machine spindles and cutting tools.
Anti-Rust Surface & Finish
The surface undergoes meticulous blackening, nickel plating, or polishing treatments, providing superior corrosion and oxidation resistance to ensure long-term rust prevention and a pristine appearance.
Working Principle
The working principle of the ER Collet Chuck relies primarily on the axial thrust and wedge effect generated by tightening the clamping nut:
Elastic Deformation and Contraction: The ER collet features an external tapered profile with multiple longitudinal slots around its circumference. When the collet is placed into the taper bore of the holder and the locking nut is screwed down, the thrust ring inside the nut pushes the collet axially along the taper.
Uniform Tool Clamping: Driven by the mating of the inner and outer tapered surfaces, the collet contracts uniformly inward in a radial direction (elastic deformation), causing its inner bore to tightly grip the inserted straight-shank tool.
Large-Area Frictional Grip: This tapered mating creates large-area surface contact between the collet, holder, and cutting tool, generating immense frictional force and clamping rigidity. This ensures that the tool remains securely locked without loosening, slipping, or pulling out during high-speed rotation and heavy cutting torque.
Technical Specifications
|
Size |
D |
D1 |
L |
Capacity |
|
NT30-ER16-50 |
28 |
28 |
50 |
1-10 |
|
NT30-ER20-50 |
34 |
34 |
50 |
1-13 |
|
NT30-ER25-50 |
42 |
42 |
50 |
2-16 |
|
NT30-ER32-50 |
40 |
50 |
50 |
2-20 |
|
NT30-ER40-80 |
50 |
63 |
80 |
4-26 |
|
NT40-ER16-50 OTT |
28 |
28 |
50 |
1-10 |
|
NT40-ER20-50 OTT |
34 |
34 |
50 |
1-13 |
|
NT40-ER25-50 OTT |
42 |
42 |
50 |
1-13 |
|
NT40-ER32-50 OTT |
50 |
50 |
50 |
3-20 |
|
NT40-ER40-80 OTT |
50 |
63 |
80 |
4-26 |
|
NT50-ER25-60 OTT |
42 |
42 |
60 |
1-13 |
|
NT50-ER32-70 OTT |
50 |
50 |
70 |
1-20 |
|
NT50-ER40-80 OTT |
63 |
63 |
80 |
2-26 |
|
NT50-ER50-90 OTT |
70 |
78 |
90 |
6-34 |
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