22.214.171.124 Overspeed trip device. - An overspeed trip device shall be employed if specified (see 6. 2).
Motors requiring overspeed trip devices need not comply with 126.96.36.199. The overspeed trip device shall
be set at the r. p. m. considered by the manufacturer to be a safe r.p.m. but no case shall permit the
motor to run at an r. p. m. greater than 125 percent rated r.p.m. at the highest voltage rating of the motor.
3.7.5 Mounting .- Horizontal motors shall be suitable for either deck or underside suspension.
188.8.131.52 Feet. - The feet may be detachable and secured by means of bolts if by this arrangement the
motor can be passed through a 25 inch diameter round hatch.
3.7.6 Terminal boxes. - Terminal boxes shall not be drilled or tapped by the contractor. This
requirement shall be indicated on the master drawing (see 184.108.40.206, listing ('b) (9)). Provision shall be
made for mounting the terminal box on either side of the motor. The internal leads shall be of sufficient
length so as to be brought to the terminal box on either side of the motor.
3.7.7 Repair parts. - The requirements of 3.4 shall apply except that armatures shall not be
furnished as onboard repair parts. In addition, repair parts boxes (see Specificatlon MIL-B-233) shall not
3.7.8 Skewing .- Armature slots shall be skewed with respect to the pole tips.
A rake angle of the brush other than zero shall be provided
3.7.9 Brush rake angle. -
3.7.10 Bearings. - In addtiion to the requirements of 220.127.116.11, bearings specially selected for
quiet operation shall be used when specified (see 6.2).
3.7.11 Center of gravity. -
The center of gravity of the motor shall be indicated on the drawing.
3.7.12 Dynamic balance. - The degree of balance shall be "Precision" in accordance with table 1
unless otherwise specified (see 6.2).
4. QUALITY ASSURANCE PROVISIONS
4.1 Inspection procedures. - For Naval purchases, the general inspection procedures shall be in
accordance with General Specifications for Inspection of Material.
4. 1.1 Lot. - A lot shall consist of a group of motors of the same enclosure and of similar design,
construction and materials, produced under uniform conditions and over a short period of time.