ANSI CEMA-501.1-2003 pdf download Welded Steel Wing Pulleys
1.1 This Standard applies to a series of straight face and crown face welded steel wing pulleys which have a number of steel wing plates that extend radially from the longitudinal axis of two compression type hub assemblies and are equally spaced about the pulley circumference. The purpose of the compression type hubs is to provide a clamp fit on the shaft. The wings are supported or joined by welded steel plates so arranged as to form the shape of two frustums of cones or regular pyramids being joined at their bases. A bar of sufficient radius is attached to the outer longitudinal edge of each wing to provide more contact area with the belt.
This standard is restricted to pulleys which do not transmit torque. This standard is not applicable to pulleys with continuous (uninterrupted) rims, or cast pulleys. This standard applies to pulleys using compression type hubs. It does not cover pulleys welded to the shaft or high pressure keyless locking assemblies.
This standard establishes load ratings, allowable variation from nominal dimensions, permissible crown dimensions and such overall dimensions as are normally necessary to establish clearances for location of adjacent parts. The pulley diameters, face widths and shaft sizes shown are those that are nominally used in current belt conveyor and elevator practice. These only are covered by this standard; all other sizes and capacities are not covered by this standard.
1.2 Welded steel wing pulleys covered by this standard should not be used with steel cable and other high modulus belts because such belts create stress concentrations and demand manufacturing tolerances beyond the capacities of these pulleys.
2. DIMENSIONS AND TOLERANCES
2.1 DIAMETERS: Standard welded steel wing pulley diameters are 8, 10, 12, 14, 16, 18, 20, 24, 30 and 36 inches. All other sizes are considered special. These nominal diameters apply to straight and crown-face pulleys and are for bare pulleys only. They do not include any increase brought about by lagging.
2.2 DIAMETER VARIATIONS: Permissible variations from nominal diameter are based on face width as follows:
These limitations apply equally to straight face and crown face pulleys.
The nominal diameter is measured at the midpoint of the face width. The diameter is defined as the bare diameter exclusive of any lagging. The permissible diameter variations listed are not to be construed as runout tolerance on diameter. The listed variation in nominal diameter may occur from one pulley to another. Runout tolerance on diameter shall not exceed 3/16″ total indicator reading for all pulley diameters.
2.3 FACE WIDTHS: Standard welded steel wing pulley face widths are 12, 14, 16, 18, 20, 22, 26, 32, 38, 44, 51, 57, 63, and 66 inches. All other sizes are considered special.
2.4 FACE WIDTH VARIATIONS: Permissible face width variation from nominal face width is ± 1/4″ for all sizes. Face width is defined as the length of the wing or contact bar along the shaft axis.