MIL-DTL-17060G(SH)
APPENDIX A
(2) Dimensions and the number and contour of blades are as shown on the approved drawings.
(3) The fan surfaces which move the air are free from any irregularities, surplus weld material, or any
other projections which may be a source of excessive airborne noise.
(4) Fans which break down into several parts are indexed in a manner such that they can be assembled in
one way only.
c. End shields, bearing housings, end caps, and frames. Examination shall be conducted to determine the
following:
(2) Sufficient metal is available for drilling and tapping.
(3) Drilling, tapping, and bolt centers are as shown on the approved drawings. Holes are clean, free of
chips, and are drilled straight. There are no burred threads. Holes are spotfaced and are located so that edge
distance is adequate in accordance with the approved drawings.
(4) End shields and frames have been cleaned and have been given a coat of primer and enamel or a coat
of rust preventive before storing.
(5) The end shields, except mating surfaces (such as bearing housings and rabbets) are cleaned, primed,
and painted on the inside surface prior to assembly. The inside of the frame is primed and painted if it did not
receive at least two dips and bakes in the varnish treatment of the stationary electrical components.
(6) Mating surfaces of shields and frames are concentric and square as shown on the approved drawings.
(7) Dimensions, dimensional tolerances, and concentricities are as shown on the approved drawings.
(8) Bearing housings have sufficient metal to permit redrilling and bushing of the housing.
A.2.3 Examination during assembly. Items to be examined during assembly shall be as follows:
General. General examination shall be conducted to determine conformance to the following:
a.
(1) All items of A.2.1 above.
(2) Parts are interchangeable, and no handfitting or selective matching of parts is necessary.
(3) No shims, spacers, or washers are used in the assembly to correct machining or material discrepancies.
(4) Assembly and disassembly of equipment can be done without the use of special tools. Special tools
are defined as those tools not listed in the Federal Supply Catalog [copies of this catalog may be consulted in the
Office of the Defense Contract Management Area Operations (DCMAO)].
b. Items examined during winding and assembly of rotating elements. Examination shall be conducted to
determine conformance to the following:
(1) Keys shown on the approved drawings are used to prevent rotational movement of all rotating parts
(such as rotors or armatures).
(2) When any parts are pressed on the shaft, the pressure required to press on these parts is within the
limits shown on the approved drawings.
(3) When any parts are shrink fitted on the shaft, the interference shrink fits of the parts are as shown on
the approved drawings.
(4) Axial movement of parts is prevented by means of press rings, snap rings, press fit, shrink fit, or lock
washers and nuts as shown on the approved drawings.
(5)
Fans are secured to the shaft as shown on the approved drawings.
(6) For fabricated rotors, the bars are securely retained in the slots, bars are not able to shift in slots and
bars are welded or brazed to the end rings with an even distribution of weld metal. Bars and end rings are of
uniform cross-sectional area throughout.
(7)
Bearings are of the size and type as shown on the approved drawings.
(8) The inner races of the ball bearings are secured to the shaft by means of shaft shoulders, lockwashers
and nuts, or by the opposed shoulder method as shown on the approved drawings.
(9)
Bearing locknuts and lockwashers, where used, are as shown on the approved drawings.
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