A milling-boring specialist has patented a Dynamic CNC Ram Balance System which and dynamically corrects for effects of spindle and ram droop when the ram or quill of a machine are advanced and retracted to their programmed positions. This system is effective where the machine’s working envelope which can be up to 280 in. (7 m) of travel in the vertical axis. It adjusts the ram traverse over the Y and Z axis correcting the position and the angle of the cutting tool with respect to the horizontal working plane.
Key features of the system include:
CNC control – The system is driven by a numerically controlled (NC) servomotor. It is monitored and measured by the control using an internal scale to confirm the performance of the system.
Dynamic Ram Droop Control – In addition to compensation tables in the CNC control for each head, a Heidenhain feedback scale with a servo-motor adjustment system is mounted on the ram provides dynamic real time compensation of ram droop.
Balance system – It works in positive and negative directions compensating for heads in a wide variety of weights and positions.
Also, this NC controlled electro-mechanical system, which is carried in the vertical saddle, can also be integrated with the automatic head-changing system and can self-correct the true position of the quill or ram for different milling heads that can vary in weight between 44 lb (20kg.) and a massive 3,500 lb (1,600 kg.) The Ram Balance System guarantees a maximum deviation of less than 0.00157 in. (0.04 mm) for the ram droop at the spindle nose and 0.00048 in/ft (0.04 mm/m) over the complete ram traverse of 76 in. (1,900 mm), with actual results typically below 0.00098 in. (0.025mm) and 0.0003 in./ft (0.025 mm/m) respectively. This system operates independently from the fully-integrated thermal compensator.
Soraluce America Inc.
Filed Under: O&M