within 400 m 1/64 inch. Sufficient machining stock shall be allowed on
placing pads to ensure true surfaces of solid material. Finished contact
or bearing surfaces shall be true and exact to secure full contact.
Journal surfaces shall be polished and all surfaces shall be finished with
sufficient smoothness and accuracy to ensure proper operation when
assembled. Parts entering any machine shall be accurately machined and all
like parts shall be interchangeable except that parts assembled together
for drilling or reaming of holes or machining will not be required to be
interchangeable with like parts. All drilled holes bolts shall be
accurately located.
2.2.7.1
Finished Surfaces
Surface finishes indicated or specified shall be in accordance with ASME
B46.1. Values of required roughness heights are arithmetical average
deviations expressed in micrometers microinches. These values are maximum.
Lesser degrees will be satisfactory unless otherwise indicated.
Compliance with surface requirements shall be determined by sense of feel
and visual inspection of the work compared to Roughness Comparison
Specimens in accordance with the provisions of ASME B46.1. Values of
roughness width and waviness height shall be consistent with the general
type of finish specified by roughness height. Where the finish is not
indicated or specified it shall be that which is most suitable for the
particular surface, provide the class of fit required and be indicated on
the detail drawings by a symbol which conforms to ASME B46.1 when machine
finishing is provided. Flaws such as scratches, ridges, holes, peaks,
cracks or checks which will make the part unsuitable for the intended use
will be cause for rejection.
2.2.7.2
Unfinished Surfaces
All work shall be laid out to secure proper matching of adjoining
unfinished surfaces unless otherwise directed. Where there is a large
discrepancy between adjoining unfinished surfaces they shall be chipped and
ground smooth or machined to secure proper alignment. Unfinished surfaces
shall be true to the lines and dimensions shown and shall be chipped or
ground free of all projections and rough spots. Depressions or holes not
affecting the strength or usefulness of the parts shall be filled in an
approved manner.
2.2.7.3
Pin Holes
Pin holes shall be bored true to gauges, smooth, straight and at right
angles to the axis of the member. The boring shall be done after the
member is securely fastened in position.
2.2.7.4
Gears shall have machine cut teeth of a form conforming to applicable
design requirements of AGMA 2005 and AGMA 6001 unless otherwise specified
or shown.
2.2.7.5
Shafting
All shafting shall be turned or ground hot-rolled or cold-rolled steel as
required unless otherwise specified or authorized. Fillets shall be
provided where changes in section occur. Cold-finished shafting may be
used where keyseating is the only machine work required.
SECTION 05055A
Page 22
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