Balancing Weights for Gantry Machining Center
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Solution Overview
Problem
Existing vertical machining centers in gantry design for milling, drilling, and turning face issues with manual attachment of balancing weights, which impairs the clamping surface, causes interfering contours, and poses a risk of damage due to incorrect attachment, and lack automated adjustment capabilities, especially for the spread angle method.
Innovation Solution
A circular ring-shaped receiving groove with an undercut is machined below the workpiece table surface, allowing balancing weights to be securely and easily attached and adjusted, with a control and regulating device determining their angular position, enabling safe, space-saving, and automated attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If balancing weights are manually attached to the clamping surface or outer circumference of the workpiece table, then the table imbalance can be compensated, but the usable clamping surface is impaired and interfering contours are created that limit machining options
Solution Approach 1:
The receiving groove is positioned on the underside of the workpiece table, moving the balancing weight attachment location from the top surface (clamping area) to the bottom surface. This dimensional relocation allows balancing weights to be attached without interfering with the clamping surface area, thus resolving the contradiction between imbalance compensation and usable clamping surface area.
2Reliability
If balancing weights are attached to the outer circumference of the workpiece table, then table imbalance can be compensated, but interfering contours are created between the workpiece table and tool spindle that can cause collisions
Solution Approach 1:
The balancing weights are extracted from the outer circumference location and relocated to the underside of the workpiece table. This extraction removes the harmful interfering contours that would otherwise exist between the balancing weights and the tool spindle, eliminating the collision risk while maintaining the imbalance compensation function.
3Ease of manufacture
If balancing weights are manually attached using screws to T-slots, then attachment is possible, but the process is time-consuming and cannot be easily automated
Solution Approach 1:
The manual screw attachment mechanism is replaced with a groove-based retention system. The receiving groove with its geometric features (undercut, flanks) provides automatic mechanical retention of the balancing weights without requiring manual screw fastening, enabling automated placement and significantly reducing attachment time.
4Ease of manufacture
If balancing weights are attached with screws to T-slots, then attachment is possible, but the attachment process is complex and requires precise manual operation
Solution Approach 1:
The receiving groove structure is designed to self-retain the balancing weights through its geometric features (undercut, flanks). The balancing weights automatically engage with the groove features when placed, eliminating the need for complex manual screw fastening operations and making the attachment process simpler and more intuitive.
Data Source
Figure 1
Figure 2~2c
Figure 3
AI summary
The center has a rotatably driven workpiece table (1) mounted in a bridge support (3). Balancing weights (4) are designed in an external geometric shape, such that the weights are movably guided into a circular receiving-groove (6), a contact surface (22) of each weight is pressed against an edge of an undercut (7) of the groove and the weights are secured from being dropped out in horizontal and vertical directions. The weights in the groove are movable in an angular position preset by a controlling and regulating device (14) and are fixed in the groove in a force-fit or form-fit manner.