CGK-99 / CGK-99S Ultra-Precision Nut Turning Center
Hard-Turn Precision Nuts and Ball-Screw Raceways
The CGK-99 and CGK-99S combine turning-center flexibility with the accuracy needed for hardened ball-screw components.
The CGK-99 / CGK-99S is an ultra-precision nut turning center for the ball-screw industry. It hard-turns ball-screw nut raceway sections, nut end faces, outer diameters, chamfers and radii on workpieces up to HRC 65, holding size and shape accuracy to IT4 and surface roughness down to Ra 0.32 μm. The machine is a horizontal precision CNC lathe with three-axis turning-center capability: X and Z linear axes plus a C-axis are all closed-loop controlled, and a power turret enables high-precision turning, milling and drilling of straight lines, arcs, tapers, threads and end faces. With an optional tailstock and steady rest, the same machine can also hard-turn ball-screw raceways. The CGK-99 handles swing diameters up to Φ630 mm and nuts up to 480 mm long; the CGK-99S is the compact configuration for Φ400 mm swing and 190 mm nut length.
Request a Quote →Key Features & Working Principle
Six capabilities that let one machine cover hardened nut machining from raceway to end face.
Hardened-Part Hard Turning
Finish-turns precision hardened components from HRC 50 to HRC 65, reducing or replacing downstream grinding operations.
X / Z / C Closed-Loop Control
Two linear axes and the spindle C-axis are all closed-loop controlled for precise angular indexing and contour generation.
Three-Axis Turning-Center Function
Full three-axis linkage turning-center capability supports complex revolved bodies in one clamping.
Power Turret
A powered tool turret completes turning, milling and drilling operations without transferring the part to a second machine.
IT4 Size & Shape Accuracy
Holds size and shape accuracy to IT4, meeting the tight tolerances required for ball-screw nut interchangeability.
Expandable to Ball-Screw Raceway Turning
Add a tailstock and steady rest to hard-turn ball-screw raceways in addition to nut geometry.
Why Choose the CGK-99 / CGK-99S
Hard turning on a dedicated nut turning center cuts cycle time and improves concentricity versus separate operations.
Grinding-Grade Surface Finish
Thread surface roughness reaches Ra≤0.32 μm, so hard turning can replace finish grinding in many nut applications.
IT4 Precision
Size and shape accuracy held to IT4 keeps ball-screw nuts within the tolerance bands needed for smooth motion.
One Setup, Multiple Features
Raceway section, end face, OD, chamfer and rounding are machined in one clamping to maintain runout and datum alignment.
C-Axis Indexing
A programmable C-axis with 0.001° resolution supports radial holes, slots and other indexed features on nuts and sleeves.
Rigid for Hardened Materials
A heavy-duty horizontal bed and high-torque spindle handle continuous hard turning at HRC 50–65 without chatter or size drift.
Two Size Configurations
CGK-99 for large nuts up to Φ630 mm swing and 480 mm length; CGK-99S for compact cells with Φ400 mm swing and 190 mm length.
CGK-99 / CGK-99S — Technical Data
Main technical performance indicators from the factory datasheet.
| Parameter | Unit | CGK-99 | CGK-99S |
|---|---|---|---|
| Model | — | Ultra-precision nut turning center | Ultra-precision nut turning center |
| Max swing diameter over carriage | mm | Φ630 | Φ400 |
| Max nut turning length | mm | 480 | 190 |
| Carriage cross travel | mm | 370 | 350 |
| C-axis min output unit | ° | 0.001 | 0.001 |
| Spindle speed | rpm | 0–2000 | 0–2000 |
| Spindle through-hole diameter | mm | Φ120 | Φ60 |
| Spindle motor rated power | kW | 22 | 11 |
| X-axis resolution | mm | 0.001 | 0.001 |
| Z-axis resolution | mm | 0.001 | 0.001 |
| Thread surface roughness | μm | Ra≤0.32 | Ra≤0.32 |
Applications
Designed for ball-screw manufacturers and precision motion-system suppliers.
Frequently Asked Questions
What parts can the CGK-99 / CGK-99S machine?
What workpiece hardness can it handle?
What accuracy and surface finish does it achieve?
What is the difference between CGK-99 and CGK-99S?
Can it machine features other than turning?
What information is needed for a quotation?
Configure a CGK-99 / CGK-99S Nut Turning Center
Send us your nut or screw raceway diameter and length, workpiece hardness, accuracy grade and surface-finish requirements, material, annual volume, and whether you need the tailstock/steady-rest option. Our engineering team will recommend CGK-99 or CGK-99S and prepare a quotation.
Request a Quote →
