Linear shaft supports are critical hardware components designed to position, secure, and stabilize round shafts (rods) within a linear motion system. acting as the structural "anchors," they securely connect the guidance shaft to the machine frame, ensuring rigidity and accuracy.
Primary Functions
1.Secure Positioning (Fixation):
Shaft supports clamp firmly onto the shaft to prevent unwanted movement. While the linear bearing is designed to slide, the shaft itself must remain stationary. The support prevents both axial slippage (back-and-forth) and rotation.
2.Deflection Prevention:
- End Supports: For shorter spans, supporting the shaft at both ends is usually sufficient to maintain straightness.
- Continuous Supports: For long travel lengths (e.g., >1 meter) or heavy loads, shafts are prone to sagging under weight. Continuous shaft support rails run the entire length of the shaft, supporting it from underneath to eliminate bending and vibration.
3.Precision Alignment:
A smooth linear motion system relies on the parallel alignment of two shafts. Shaft supports provide a machined reference surface, facilitating precise parallel installation to ensure the carriage glides smoothly without binding.
Common Types
SK Series (Vertical Mount): A "standing" aluminum block that elevates the shaft above the mounting surface. This is the industry standard for end-supported applications.
SHF Series (Flanged/Horizontal Mount): A low-profile mount featuring a flange design. It is ideal for mounting shafts to side walls or where vertical clearance is limited.
Support Rail (Continuous): An aluminum extrusion that bolts to the machine bed along the full length of travel. The shaft is fastened directly onto this rail, creating a "Fully Supported Rail" (often referred to as SBR or TBR) capable of handling heavy loads and long strokes without deflection.