The NDC Precision Screw Collet Chuck is a high-precision CNC machine tool holder system, commonly known as a screw-type or rear-pull collet chuck. Utilizing a specialized rear-pull locking mechanism, it pulls and secures the elastic collet along with the tool backward into the chuck's inner cavity. This product is widely used for drilling, tapping, reaming, and light-duty milling operations across various CNC milling machines, machining centers, and dedicated machinery.
Product Description
1.Rear-Pull Locking Structure: Features a unique rear-pull tightening design that causes the collet to contract and seat backward under force, ensuring exceptional concentricity and clamping stability.
2.High Precision & Low Runout: Delivers outstanding radial runout precision (typically down to the micron level), effectively reducing tool deflection, extending tool life, and ensuring superior workpiece surface finish.
3.Compact Structure & High Rigidity: Designed with a balanced and robust body that maintains high rigidity, preventing deformation under high-load or continuous cutting conditions.
4.Versatility & Safety: Accommodates standard-specification elastic collets, offering a wide clamping range alongside strong, uniform clamping force to prevent tool loosening or slippage during machining.
Technical Parameters
|
Size |
D |
D1 |
L |
L1 |
L2 |
L3 |
|
BBT30-NDC14-95 |
30 |
53 |
95 |
48 |
14 |
3 |
|
BBT30-NDC14-140 |
30 |
53 |
140 |
93 |
59 |
3 |
|
BBT30-NDC20-95 |
40 |
53 |
95 |
48 |
16 |
3 |
|
BBT40-NDC14-75 |
30 |
53 |
75 |
48 |
14 |
3 |
|
BBT40-NDC14-120 |
30 |
53 |
120 |
93 |
59 |
3 |
|
BBT40-NDC20-75 |
40 |
63 |
75 |
48 |
16 |
3 |
|
BBT40-NDC20-120 |
40 |
63 |
120 |
93 |
65 |
3 |
|
BBT40-NDC32-115 |
63 |
63 |
115 |
88 |
84.5 |
3.5 |
|
BBT50-NDC20-130 |
55 |
70 |
130 |
92 |
73 |
3 |
|
BBT50-NDC32-150 |
70 |
70 |
150 |
112 |
108.5 |
3.5 |
Working Principle
The NDC Precision Screw Collet Chuck operates on the principle of threaded transmission and rear-taper compression:
1.Tool Insertion: Insert the cutting tool (such as a drill or end mill) into the matching elastic collet, and place them together into the front bore of the NDC chuck.
2.Rotation Drive (Rear-Pull Action): Rotating the locking nut or the rear-pull mechanism transforms rotational movement via threads into axial push-pull forces.
3.Taper Contraction & Clamping: This axial force drives the collet backward into the corresponding internal taper cone of the chuck body. Because of the external taper on the collet, the inward radial pressure causes it to uniformly contract inward.
4.Secure Locking: The inner bore of the collet firmly grips and locks onto the tool shank across a 360-degree perimeter, achieving secure clamping and high-precision power transmission.
Hot Tags: precision screw collet chuck, China precision screw collet chuck manufacturers, suppliers, factory, ER Spring Collet Tool Holder BT, ER Spring Collet Tool Holder CAT, ER Spring Collet Tool Holder SK, High Speed Chuck, Hydraulic Tool Holder, Quick Change Tapping Chuck
