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TSUGAMI main spindle collet 1

Functions and uses of Swiss-type lathe chucks
Swiss-type lathe chucks are core precision clamping components of CNC Swiss-type lathes. They are mostly spring-loaded high-precision chucks, and are divided into two main types: spindle chucks and back spindle chucks. They are often used in conjunction with guide bushings and are key components to ensure high-speed, high-precision, and automated machining of slender shafts and tiny precision parts. They are widely used in small precision metal cutting machining scenarios.

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Enclosure drawings

Standard hole, special-shaped hole, slot shape, customized

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Product parameters

Models	Collet （Unit: mm）
TSUGAMI	d	D	L
T7/B007	10	16	47
L10/NT11	14	20	47
B023/BU26	33	40	80
BA26	33	40	80
NP16/NP17/B012/BS12	23.8	28	62
BS20/S20	28	35	77
BM16	30	38	75
B032	37	44	91.2
B0385	43	53	92
B0385L	58	70	105
B0385C	48	54	100
other models will be updated

Core Functions

Precise clamping and centering ensure machining accuracy.

This is the core function of the chuck. Through elastic contraction and deformation, it uniformly grips the bar stock workpiece, achieving ultra-high concentricity positioning and effectively controlling workpiece rotational runout with an accuracy within 0.005mm. It completely solves the problems of eccentricity and wobbling during the machining of slender bars, ensuring the consistency of parts' outer diameter, hole diameter, thread, and other dimensions, which is the fundamental guarantee for high-precision machining by Swiss-type lathes. At the same time, it can withstand the high-speed rotational torque of the spindle, preventing workpiece loosening or displacement during machining.

Stable clamping, suitable for high-speed continuous machining.

The sliding headstock chuck is made of high-strength spring steel, tungsten steel, and other materials, providing high rigidity, uniform and stable clamping force, and is suitable for high-speed rotation, reciprocating feeding, and continuous cutting conditions of machine tools. During high-volume continuous machining, it maintains a clamped state at all times, resisting cutting vibration and cutting force, preventing workpiece displacement and chatter, significantly improving the surface finish of parts, and reducing machining defects.

Cooperate with machine tools to complete automated feeding and segmented processing.

Unlike ordinary lathe chucks, the Swiss-type lathe chuck can move back and forth with the spindle, working in conjunction with the machine tool's feeding mechanism, guide sleeve, and back clamp to achieve automatic feeding, segmented clamping, and segmented cutting of bar stock. It eliminates the need for repeated manual clamping, allowing for continuous machining of long bar stock in a single operation. This aligns with the unique machining principle of the Swiss-type lathe—"workpiece moves, tool remains stationary"—significantly improving automated machining efficiency.

Protect workpieces and equipment, and reduce wear and tear.

The elastic clamping characteristic of the chuck avoids workpiece damage and deformation caused by point-contact clamping of rigid chucks, making it especially suitable for machining thin-walled, small, and easily deformable parts. At the same time, the uniform force distribution clamping method reduces wear on the spindle and guide sleeves, stabilizes machine tool machining conditions, and extends the service life of equipment accessories.

Subcategories and Specific Uses

Spindle chuck

Mounted at the front end of the machine tool spindle, it is the main force-bearing clamping component. Its core purpose is to clamp raw material bars, transmit the spindle rotation power, and drive the workpiece to rotate at high speed to complete cutting processes such as turning, milling, drilling, and tapping. It is compatible with most main machining processes and is the core clamping component for machining and forming.

Back shaft back chuck

Mounted on the back spindle of a machine tool, it serves as a reverse auxiliary clamping and support. It is mainly used for clamping the tail of a workpiece, receiving materials, secondary machining of the end face, and finishing machining after cutting. It solves the problem of the tail of slender workpieces being suspended and lacking rigidity, prevents the end of the workpiece from shaking and deforming, ensures the machining accuracy of the entire length of the workpiece, and is also suitable for secondary finishing operations after parts are cut off.

Guide sleeve chuck (support mouth)

The matching auxiliary clamping components are mainly used to support ultra-long and ultra-thin bars, shorten the suspended length of the workpiece, improve the overall rigidity of the bar, and eliminate bending and vibration during the processing of long materials. They are essential accessories for the precision machining of slender shafts.

Core Application Scenarios and Applicable Workpieces

Swiss-type lathe chucks are designed for mass production of small, precision, and slender parts, and are primarily applicable in the following scenarios:

◉ Precision shaft parts: miniature shafts, pins, motor shafts, sensor shafts, precision fine shafts for medical devices, etc.

◉ Small hardware accessories: screws, nuts, precision connectors, electronic connectors, watch parts, etc.

◉ Thin-walled, easily deformable parts: micro-sleeves, thin-walled copper parts, aluminum parts, stainless steel precision parts, etc.

◉ Mass production of micro-precision parts: automated mass production of 3C electronics, optics, automotive precision parts, and non-standard small hardware parts.

Summary of Advantages

Compared to ordinary lathe chucks, Swiss-type lathe chucks offer higher clamping precision, more uniform force distribution, and faster clamping speed. They are perfectly suited to the high-speed, automated, high-precision, and high-volume machining characteristics of Swiss-type lathes, ensuring micron-level machining accuracy while significantly improving mass production efficiency and reducing workpiece scrap rates. They are an indispensable core component for precision longitudinal cutting CNC machining.

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