Zero-Max has introduced its latest ETP shaft locking devices. The keyless bushings use a self-contained hydraulic system for mounting hubs to shafts and are intended as an alternative to mechanical wedge-style locking devices in motion systems.
Precise rotational and linear positioning for ETP shaft locking devices
Zero-Max’s ETP keyless locking devices are designed for phasing and timing applications that require synchronization of machine components. The hydraulic mounting principle expands inward on the shaft and outward to the hub, which helps avoid axial movement during installation. Mechanical shaft locking devices use a tapered wedge that can cause the mounted component to move along the shaft as the wedge is drawn in, which can make positioning more difficult. The ETP approach is intended to support consistent phasing, timing and positioning during machine operation.
ETP keyless shaft bushings can be fastened, adjusted and removed using a small number of actuating screws, depending on the model. The bushings are intended for repeated mounting and adjustment cycles over their service life, which can be useful in applications where repositioning is frequent. Mechanical locking bushings typically support fewer mounting cycles.
The hydraulic design centers the component concentrically on the shaft, which reduces runout and supports balanced operation at higher speeds. The design also allows a thinner bushing wall, so hubs may not need to be oversized to fit the application.
ETP phasing for timing and synchronization
The ETP allows phase adjustment to time and synchronize machine components and to set timing between processes or stations. Once adjusted, the bushing locks in place to maintain the selected position and support consistent machine operation. Accurate timing of components can also support higher operating speeds.
For mounting, each screw corresponds to a specific torque value and the hydraulic mounting principle provides even pressure throughout the bushing. Mechanical bushings often require torque at multiple locations, and tightening one screw can affect adjacent screws, which may reduce concentricity and accuracy.
Adjustment and mounting
ETP hydraulic-based keyless bushings mount and dismount quickly and are rated for many mounting cycles. The shaft connection is phase adjustable for applications that require precise rotary timing and linear positioning with low runout.
ETP bushings use a single screw or a small number of mounting screws to support assembly and repositioning during phase adjustments or product size changes. This can reduce time needed for machine changeovers.
ETP connections provide repeatable positioning at micrometer-level accuracy and high concentricity, which is useful in automated machinery and slitter knife holders.
The keyless design eliminates the need for keyways, which can weaken shafts and wear over time, leading to lost motion. ETP shaft connections provide a keyless alternative for securing components to shafts.
ETP products are part of Zero-Max’s motion control and power transmission line, which includes shaft couplings, right-angle gear drives, other motion control components and Overhung Load Adaptors (OHLA).
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