CGK-2000 / CGK-3000 / CGK-3000A CNC High-Precision Thread Grinder
Grind Long Precision Ball Screws in One Setup
The CGK-2000/3000/3000A series is built for finish-grinding the long arc ball screws, trapezoidal screws and special thread profiles used in machine tools and automation.
The CGK-2000 / CGK-3000 / CGK-3000A is a family of CNC high-precision thread grinders developed for the rolling-function-components industry. It finish-grinds arc ball screws, high-precision trapezoidal screws and other thread profiles on workpieces up to Φ500 mm. The moving-table design covers grindable thread lengths of 2000 mm on the CGK-2000 and 3000 mm on the CGK-3000 and CGK-3000A, with between-centers distances from 2200 mm to 3200 mm. An industrial CNC control system with full closed-loop feedback runs single-pass and fully automatic grinding cycles, multi-start threads from 1 to 99 starts, dynamic tool setting, pitch compensation, pitch-taper compensation and automatic wheel-dress compensation. The result is thread geometry held to 0.005 mm within a 2π arc and surface roughness down to Ra 0.32 μm.
Request a Quote →Key Features & Working Principle
Six capabilities that make the CGK-2000/3000/3000A a complete long-bed thread-grinding solution.
Three Bed Lengths
CGK-2000, CGK-3000 and CGK-3000A cover 2000 mm and 3000 mm grindable thread lengths for medium and long ball screws.
Moving-Table Design
The worktable moves while the wheel carriage remains fixed, supporting long workpieces without sacrificing rigidity.
Full Closed-Loop CNC Control
Precision linear scale feedback on linear axes and a rotary encoder on the work spindle provide closed-loop positioning and repeatability.
Single-Pass & Automatic Cycles
Select single-pass grinding for setup and proving, or fully automatic cycle grinding for production runs.
Intelligent Compensation
Dynamic tool setting, pitch compensation, pitch-taper compensation and automatic wheel-dress compensation keep size stable.
Rigid Machine Construction
A high-strength alloy cast-iron bed and worktable with precision-scraped guideways support heavy grinding cuts without size drift.
Why Choose the CGK-2000 / CGK-3000 / CGK-3000A
A dedicated long-bed thread grinder delivers the profile accuracy and surface finish that turning or milling cannot reach on hardened screws.
Micron-Level Thread Accuracy
Profile error within 2π arc is held to 0.005 mm on CGK-2000 and 0.006 mm on CGK-3000/3000A; cumulative error over 300 mm is within 0.008–0.012 mm.
Mirror Surface Finish
Thread surface roughness reaches Ra≤0.32 μm, giving ball screws and trapezoidal screws the smooth flanks needed for long life and low noise.
Wide Pitch Coverage
Metric pitches from 1.5 mm to 48 mm, imperial threads from 2 to 18 TPI and module threads from 1 to 18 cover most long ball and trapezoidal screw specifications.
Large Helix Angle Range
Helix angles up to ±25° on all three models handle steep-lead ball screws and trapezoidal screws.
Matched to Part Length
Three bed lengths let you match machine investment to your typical screw length instead of oversizing every machine.
High-Load Capacity
CGK-3000A supports up to Φ500 mm disc-type parts and Φ400 mm with steady rest, making it suitable for heavy ball screws and large trapezoidal screws.
CGK-2000 / CGK-3000 / CGK-3000A — Technical Data
Main technical performance indicators from the factory datasheet.
| Parameter | Unit | CGK-2000 | CGK-3000 | CGK-3000A |
|---|---|---|---|---|
| Max grindable diameter (disc type) | mm | Φ400 | Φ400 | Φ500 |
| Max grindable diameter with steady rest | mm | Φ160 | Φ220 | Φ400 |
| Min grindable diameter | mm | Φ16 | Φ16 | Φ20 |
| Max distance between centers | mm | 2200 | 3200 | 3100 |
| Max grindable thread length | mm | 2000 | 3000 | 3000 |
| Center height | mm | 225 | 225 | 280 |
| Metric thread pitch | mm | 1.5–48 | 1.5–48 | 1.5–48 |
| Imperial thread pitch | TPI | 2–18 | 2–18 | 2–18 |
| Module thread range | module | 1–18 | 1–18 | 1–18 |
| Max grindable helix angle | — | ±25° | ±25° | ±25° |
| Grindable thread starts | — | 1–99 | 1–99 | 1–99 |
| Workpiece speed | rpm | 0–150 | 0–150 | 0–150 |
| Table moving speed | m/min | 0–5.0 | 0–5.0 | 0–5.0 |
| Wheel carriage in/out speed | m/min | 0–5.0 | 0–5.0 | 0–5.0 |
| Dresser feed speed | m/min | 0–1 | 0–1 | 0–1 |
| X / Y / Z axis resolution | mm | 0.001 | 0.001 | 0.001 |
| C-axis resolution | — | 0.001° | 0.001° | 0.001° |
| Wheel carriage cross travel | mm | 220 | 220 | 220 |
| Wheel spindle speed | rpm | 1000–3000 | 1000–3000 | 1000–3000 |
| Grinding wheel size (OD × ID) | mm | Φ500 × Φ305 | Φ500 × Φ305 | Φ500 × Φ305 |
| Overall dimensions (L × W × H) | mm | 7000 × 2600 × 1900 | 9000 × 2600 × 2100 | 9000 × 2600 × 2100 |
| Machine weight | kg | 13000 | 15000 | 15000 |
| Helical accuracy within 2π arc | mm | ≤0.005 | ≤0.006 | ≤0.006 |
| Helical accuracy over 300 mm | mm | ≤0.008 | ≤0.012 | ≤0.012 |
| Thread surface roughness | μm | Ra≤0.32 | Ra≤0.32 | Ra≤0.32 |
Applications
Built for manufacturers of precision threaded drive components across machine-tool, automation and heavy-equipment industries.
Frequently Asked Questions
What parts can the CGK-2000 / CGK-3000 / CGK-3000A grind?
What thread lengths do the three models cover?
What pitch and helix range can be ground?
How is grinding accuracy maintained?
What is the difference between CGK-3000 and CGK-3000A?
What information is needed for a quotation?
Configure a CGK-2000 / CGK-3000 / CGK-3000A Thread Grinder
Send us your workpiece diameter and length, thread form and pitch, helix angle, number of starts, accuracy class and surface-finish requirements, material and hardness, and annual volume. Our engineering team will recommend CGK-2000, CGK-3000 or CGK-3000A and prepare a quotation.
Request a Quote →
