ASME B5.47:1972 (2018) pdf free download – Milling Machine Arbor Assemblies
1. Scope
1.1 The standard is confined to mi ling machine arbors. The reason for confining this standard to this specified milling machine accessory is that through many years of development and general usage, there aiready exists good agreement on the structure and dimensions of milling machine atbors between competent manufacturers of such equipment here in the United States and abroad. This agreement is much better than for many other milling machine access ories and equipment. Already considerable interchangeability exists between the products of various suppliers of milling machine arbors.
The standard tries to avoid being too specific in nonessential details to avoid undue hardship on the manufacturer. The choice of material, heat treatment, surface finish any deviations from nonessential dimensions is left to the discretion of the manufacturer as long as it is compatible with the expected functional re- quirements of the arbor ass embly. The many over- lapping and intermediate sizes of the various components of an arbor assembly are minimized for the sake of economy. Some sizes of arbors and components still listed by some manu- facturers have been omitted with the knowledge that some other listed sizes would do the re- quired operations without undue ha rdship. True position tolerances and symbols are in accordance with ANSI Y14.5- 1966.
2. Definitions
2.1 Arbor Diameter
The arbor diameter is the nominal di ameter of the milling machine arbor. It defines the size of the“hole” cutter which can be mounted and driven by the arbor. The arbor diameter size and its tolerance is intended to provide the proper fit and locating accuracy in the bore of the “hole” cutter.
2.2″ Shoulder to Nut”
Length The“ Shoulder to Nut” length is the length of the arbor available between the shoulder and the face of the arbor nut. This length is considered the nominal length of the milling machine arbor.
2.3 Pilot
The pilot at the end of a style“A”mill- ing machine arbor is provided to give usually smaller milling machine arbors added support and rigidity.
2.4 Shoulder Collar
The shoulder collar is a collar with a larger chamfer on the inner diameter than the spacing collars. This large chamfer is intended to prevent interference with a stress reducing fillet radius at the shoulder.
2.5 Spacing Collar
A spacing collar is a bushing type collar furnished in various lengths. It has an inner diameter to fit with a specified clearance on the arbor diameter, it has a keyway to clear the key in the arbor. The end faces of the spacing collar are required to be parallel within specified limits to avoid distortion and inaccuracies of the arbor when assembled on the arbor.
2.6 Bearing Sleeve
Bearing sleeves act as bearing journals in the bearing supports to give increased rigidity and support to the arbor. The bearing sleeve fits closely on the arbor diameter and in the support bushing.