Atra-Flex: Installation & Maintenance Guide
T-Series: Installation Procedure
PREPARATION FOR MOUNTING HUBS: • Shaft and bore surfaces must be clean of burrs, nicks and dirt. • Shaft and bore dimensions should be checked for required fit.
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MOUNTING THE RING HUB AND FLEX HUB: • Mount the Ring Hub and Flex Hub as illustrated, flush to the shaft ends if possible. If overhang is required, maintain a minimum of 1:1 shaft contact for slip fits, or 0.6:1 for interference fits of 0.0005 per inch or greater. Tighten setscrews. COUPLING ALIGNMENT • Before moving the equipment in place for alignment, the Drive Ring must be placed behind the winged section of the Flex Hub (lobe side of Drive Ring facing Ring Hub) to rest on small diameter of Flex Hub or shaft. If laser alignment is not an option, use a dial indicator to check the parallel and angular offsets. • Attach the dial indicator to the Ring Hub with the probe contacting the outside diameter of the Flex Hub. The probe should be perpendicular to shaft centerline for the parallel offset alignment check. • Rotate the Ring Hub 360° while checking the measurements of the probe at each of the 6 wings. The total indicated run out should not exceed (TIR). INSTALLING THE INSERT • Note: The insert may be one, two, or three piece depending on size and type. Once the alignment is complete, the insert can either be wrapped around, or placed inside the pockets of the Flex Hub. INSTALLING THE DRIVE RING: • Slide the Drive Ring over the Flex Hub, positioning the ring lobes over the insert lobes until you make contact with the Ring Hub. Insert one or two cap screws with lock washers through the Drive Ring and line up the cap screws with the threaded holes of the Ring Hub. Make sure the Drive Ring is fitted completely over the locator of the Ring Hub. Hand- tighten a few to get it started, then tighten down all six cap screws to the recommended torque (TT). • To check the angular offset, adjust the indicator probe to contact the face of the Flex Hub as near to the outside diameter as possible. Rotate the Ring Hub 360°, checking the readings at a minimum of three wings 120° apart. The difference between the minimum and maximum gap measurements taken at 12:00, 4:00, and 8:00 should not exceed (A). The (E) gap can then be set using the indicator or a feeler gauge at the narrowest points, ensuring the minimum (E) dimension is maintained. • Note: The (E-) axial tolerance should be reserved for thermal growth during operation. • Note: Increase (E) to a maximum of (E+) as needed if anticipated thermal growth exceeds axial tolerance (E-). • Spacer Type Coupling: (E) is measured from the face of the spacer body. The actual spacer body length is shortened from DBSE given to allow gap (E) by factory. • Floating Shaft Coupling: (TIR) = DBSE x (A) - Note: 1° @ 1.00” = .0175”
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REPLACE COUPLING GUARD: Per OSHA requirements, all rotating equipment must be enclosed by a guard.
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