LIEBHERR LCS 300 CNC Gear Tooth Flank Grinding Machine – Year 2005
Maker : LIEBHERR
YOM : 2005
System : LIEBHERR PC-NC
Max. wheel diameter : 300 mm
Max. module : 7
Min. module : 1
Weight of the machine ca. : 15 t
Toolpiece turning speed range : 4000-10000 U/min
Tool length : 210 mm
Diameter of the table : 140 mm
Power requirement : 28 kW
LIEBHERR LCS 300 CNC Gear Tooth Flank Grinding Machine – Technical Evaluation (Year 2005)
1. Technical Evaluation Overview
The LIEBHERR LCS 300 is a CNC gear tooth flank grinding machine manufactured in 2005, designed for precision finishing of gears within a defined module range. Based strictly on the provided information, the machine supports a module range from 1 to 7, positioning it for small to medium-sized gear applications.
The grinding system allows a maximum grinding wheel diameter of 300 mm and a tool length of up to 210 mm. The workpiece table diameter is 140 mm, defining the clamping interface for gear blanks. The toolpiece turning speed range is specified as 4,000–10,000 rpm, which supports high-speed grinding operations depending on gear size and process requirements.
Control is provided by the LIEBHERR PC-NC system, and the installed power requirement is 28 kW. The machine weight is stated as approximately 15 tons, indicating a rigid structure suitable for precision grinding operations.
Critical parameters such as maximum workpiece diameter, axial travel, grinding accuracy class, dressing system configuration, and coolant system details are not provided and must be verified.
2. What to Check Before Buying
Given the limited but specific specification set, inspection should focus on the following areas:
Mechanical and axis system:
Condition and accuracy of all CNC-controlled axes, including backlash and repeatability.
Integrity and alignment of the grinding spindle and workpiece table, particularly at higher rotational speeds.
Verification of table condition and clamping accuracy for the 140 mm table diameter.
Grinding system:
Condition of the grinding spindle and compatibility with 300 mm wheel diameter tools.
Verification of grinding wheel mounting, balance condition, and dressing system (not specified).
Assessment of thermal stability during extended high-speed operation.
CNC and electrical system:
Operational status of the LIEBHERR PC-NC control, including parameter integrity, backups, and alarm history.
Confirmation of installed software options relevant to tooth flank grinding.
Inspection of electrical cabinets and verification of the 28 kW power requirement against site supply.
Coolant and auxiliaries:
Presence and condition of coolant supply and filtration systems, which are critical in gear grinding but not detailed in the provided data.
3. Typical Industrial Applications
Based strictly on the stated module range and machine configuration, the LCS 300 is technically suitable for:
CNC grinding of spur and helical gear tooth flanks within module 1 to 7.
Precision finishing operations where controlled profile and flank geometry are required.
Gear manufacturing or regrinding applications for small to medium-sized gears.
Specific achievable accuracy grades, surface finish values, and material suitability cannot be determined from the provided information.
4. Common Risks in Used Machines
For used CNC gear grinding machines of this category, typical risks include:
Grinding spindle wear, which can directly affect profile accuracy and surface quality.
Axis wear or misalignment, particularly critical in tooth flank grinding.
Control system age, where long-term support depends on installed hardware and software condition.
Incomplete documentation, such as missing dressing data, CNC backups, or electrical diagrams.
5. Maintenance and Service Considerations
With no service history provided, maintenance considerations are limited to general technical aspects:
Regular monitoring of spindle condition, axis accuracy, and machine geometry is essential.
Grinding wheels and dressing components require careful inspection due to their direct impact on gear quality.
CNC parameters and machine-specific data should be backed up prior to operation.
Any maintenance or refurbishment planning should be based on on-site inspection and functional testing rather than assumptions about service intervals or spare part availability.
Final Note:
The LIEBHERR LCS 300, as specified, is a dedicated CNC gear tooth flank grinding machine with a clearly defined module range and grinding capacity. A complete technical evaluation requires verification of workpiece size limits, axis travels, grinding accuracy, dressing system configuration, and documentation through direct inspection and testing.
