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The SGDT350 combines X and Z linear axes with a C rotary axis for ultra-precision turning of optical and precision components. Spindle, tooling and process configurations are matched to the material, geometry and surface requirements.
SGDT350 machine illustration. Configuration is defined in the technical agreement.
For flat, spherical and cylindrical optical surfaces, workholding, motion accuracy, vibration and material condition affect the finished surface. Machine selection needs to account for usable space, workpiece load and acceptance requirements as well as nominal capacity.
SGDT350 uses static-pressure guideways and spindle bearings with linear motor drives. Air spring isolation helps reduce floor-transmitted vibration. The machining capacity is φ650 mm × 300 mm; usable space is checked against the workpiece, workholding, tooling and motion clearance.
Grinding, high-speed milling, fast tool servo and ultrasonic or laser assistance can be evaluated as process options. Machining of complex geometries, spindle/C-axis architecture and interpolation capabilities are confirmed for the selected configuration.
Static-pressure motion system Static-pressure guideways and linear motor drives support a linear-axis positioning repeatability specification of ≤ 0.5 μm, evaluated using the agreed direction and method.
Spindle configuration choices Aerostatic and hydrostatic spindle options offer different speed, load and stiffness specifications for evaluation against the workpiece and process.
Axis configuration X and Z travels of 350 mm and 300 mm combine with a C axis in a three-axis configuration.
Item | Specification |
Axes | X / Z / C |
Machining capacity | φ650 mm × 300 mm |
Linear programming resolution | ≤ 0.01 nm |
Rotary programming resolution | ≤ 0.0000001° |
Larger capacities can be evaluated. Programming resolution is the numerical increment of CNC commands and depends on the selected controller. It is not feedback resolution, positioning accuracy or machining accuracy.
Item | Aerostatic spindle | Hydrostatic spindle |
Speed | Max. 10000 r/min | 0–1500 r/min |
Load capacity | 50 kg | 120 kg |
Axial stiffness | ≥ 350 N/μm | ≥ 600 N/μm |
Radial stiffness | ≥ 130 N/μm | ≥ 200 N/μm |
Rotational accuracy | < 30 nm | < 50 nm |
Workholding | Vacuum chuck | Vacuum chuck |
Spindle options and aerostatic C-axis specifications are listed separately. The C-axis value of 3000 r/min does not apply to the hydrostatic spindle. Maximum load, speed and accuracy are not assumed to apply simultaneously.
Rotational accuracy is a length-based specification. Direction, error components, measurement position and conditions follow the component test definition. It is not angular positioning accuracy.
Item | X | Z |
Travel | 350 mm | 300 mm |
Guideway type | Hydrostatic / aerostatic | Hydrostatic / aerostatic |
Drive | Linear motor | Linear motor |
Positioning repeatability | ≤ 0.5 μm | ≤ 0.5 μm |
Maximum travel speed | 4000 mm/min | 4000 mm/min |
Straightness / test length | 0.3 μm / 300 mm | 0.3 μm / 300 mm |
Repeatability follows the agreed direction and evaluation method. Straightness applies only to the stated test length, without extrapolation. Measurement direction, limit definition and acceptance method follow the technical agreement.
Item | C axis aerostatic configuration |
Bearing and drive | Aerostatic bearing; torque motor direct drive |
Maximum speed | 3000 r/min |
Angular positioning repeatability | ≤ 1.0 arcsec |
Item | Requirement or configuration |
Vibration isolation | Air spring isolation |
Reference operating temperature | 20 °C ± 0.5 °C |
Base power supply | Three-phase, five-wire; 380 V; 50 Hz |
Air supply and installation | Clean, dry air; inlet requirements, dimensions and service space are supplied for the selected configuration. |
Applications include flat, spherical and cylindrical optical surfaces and precision components with corresponding ultra-precision surface requirements. Complex geometries require process evaluation of the selected configuration, workholding and toolpath.
Selection focus: establish whether X, Z and C meet the geometry and machining requirements. Additional tool orientation or linear motion requirements can be reviewed against SGDT350G or SGDT350F.
Material | Application conditions |
Aluminum, suitable aluminum alloys and copper | Confirm suitability against composition, condition, tooling and the configured process. |
Nickel, single-crystal silicon and germanium | Subject to application review of the material grade, condition and machining requirements. |
Steel and suitable hard, brittle ceramics | Ultrasonic, laser or combined assistance can be evaluated. Material range and performance are established through sample trials. |
Machining Grinding, high-speed milling, fast tool servo, ultrasonic assistance, laser assistance, combined laser-ultrasonic assistance and in-situ balancing.
Metrology and tool setting Optical measurement and tool setting, contact tool setting and microscope-assisted centering.
Process support Vacuum workholding, zero-point locating, video monitoring, chip collection, mist lubrication, cooling and air treatment / filtration.
These options are subject to confirmation by model and process. The agreed configuration defines the scope of supply.
Left: convex-surface machining. Right: ZYGO 3D data plot from the corresponding series example.
Item | Case data from the product brochure |
Workpiece | φ75 mm / SR250 |
Material | High-purity aluminum alloy |
Form error | PV ≤ 0.2 μm |
Surface roughness | Ra ≤ 3.0 nm |
The case specifications apply only to the stated high-purity aluminum alloy convex sphere. They are not universal guarantees across the full machining capacity or other materials. Evaluation and acceptance conditions follow the technical agreement.
The ZYGO screenshot illustrates the measurement-data distribution. It is neither an independent SGDT350 acceptance report nor verification of the PV or Ra specifications in the table.
The color-scale endpoints are +125.72 nm and −116.44 nm, a displayed span of 0.24216 μm. No PV result or complete evaluation settings are shown. The scale span cannot be treated as a reported PV result or used to verify PV ≤ 0.2 μm.
Provide the material grade, diameter, spherical radius, workholding conditions and target specifications. Agree on the evaluation aperture, removed fit terms and filtering for form assessment, and separately define the area and method for roughness measurement. APEX can coordinate selection review and sample validation.
Q1: What is the SGDT350 ultra-precision diamond turning machine?
The SGDT350 is a 3-axis ultra-precision single-point diamond turning machine for optical and precision components. It combines X and Z linear axes with a C rotary axis and uses static-pressure guideways and spindle configurations, linear motor drives and air-spring vibration isolation to support the machining process.
Q2: What axis configuration does the SGDT350 use?
The SGDT350 uses an X / Z / C three-axis architecture. The X and Z axes provide linear motion, while the C axis is a rotary axis. Published linear travel is 350 mm on X and 300 mm on Z.
Q3: What materials can the SGDT350 machine?
Published material candidates include aluminum and suitable aluminum alloys and copper. Nickel, single-crystal silicon and germanium are subject to application review. Material suitability depends on composition, condition, tooling and the configured process. Ultrasonic, laser or combined assistance can also be configured for steel and suitable hard, brittle ceramics, with material range and performance established through sample trials.
Q4: What optical surface forms can the SGDT350 machine?
The published brochure lists flats, spheres and cylindrical surfaces. More complex geometries depend on the selected setup, tooling and process configuration.
Q5: What is the machining capacity of the SGDT350?
The published machining capacity is φ650 mm × 300 mm. Larger capacities can be evaluated, but usable capacity depends on the workpiece, workholding, tooling and motion clearance.
Q6: What spindle configurations are available for the SGDT350?
The brochure lists aerostatic and hydrostatic spindle configurations. The aerostatic spindle is specified up to 10,000 r/min with a 50 kg load capacity, while the hydrostatic spindle is specified at 0–1,500 r/min with a 120 kg load capacity. Final spindle selection depends on the configured machine and application.
Q7: What process and equipment options can be configured on the SGDT350?
Published options include grinding, high-speed milling, fast tool servo, ultrasonic or laser assistance, combined laser-ultrasonic assistance and in-situ balancing. Metrology and support options include optical measurement and tool setting, contact tool setting, microscope-assisted centering, vacuum workholding, zero-point locating, video monitoring, chip collection, mist lubrication, cooling and air treatment or filtration. Option availability is confirmed by model and process.
Q8: What machining result is shown in the SGDT350 brochure?
The representative case is a φ75 mm / SR250 convex spherical surface in high-purity aluminum alloy. The published case reports form error PV ≤ 0.2 μm and roughness Ra ≤ 3.0 nm. These values apply to the specific published case and are not universal guarantees across the full machining capacity or other materials.
Q9: Does the 0.01 nm programming resolution mean 0.01 nm machining accuracy?
No. The published linear programming resolution is ≤ 0.01 nm, but programming resolution is only the numerical increment of CNC commands. It is not feedback resolution, positioning accuracy or machining accuracy. Applicability also depends on the selected controller.
Q10: What installation conditions are specified for the SGDT350?
The published reference operating temperature is 20 °C ± 0.5 °C. The base power supply is three-phase, five-wire, 380 V, 50 Hz. Clean, dry air is required, while inlet requirements, machine dimensions and service space are supplied for the selected configuration. Air-spring vibration isolation is also specified
Send the target model SGDT350, part drawings or a 3D model, material grade and condition, dimensions and weight, form and roughness targets, planned production volume and installation conditions for configuration review and quotation.
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