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MIL-T-13906H (AL)
3.4.6. InInterchangeability.  All parts shall be manufactured to such
standards as will permit replacement or adjustment without modification of
parts or work table  Where practicable, all such parts shall be. permanently
and legibly marked with applicable part numbers in accordance with
MIL-STD-130.
3.5. Performance.  The work tables shall comply with the following
static proof load capacity and vibration requirements.
3.5.1.  static load l  The work tables shall be capable of supporting
their respective proof load for a period of 24 hours. The maximumformation
de
(permanent set) of shelves and drawers support shall not exceed 1/16 inch (type
I tables) and 1/8 inch (type II tables) from the original trammel dimensions
after static load.  Drawers must move freely and without interference, and the
doors must open and close as designed.
3.5.1.1.  Type I, classes 1 and 2 proof load capacity.  The type I, class
1 work table proof load is 2,400 pounds.  The type I, class 2 work table proof
load is 2,100 pounds.  The open shelves and the shelves with hinged doors
(acmes full length of table) shall be capable of supporting a proof load of
600 pounds each. The individual drawers shown in Figures 1 and 2 shall be
capable of supporting the f ollowing loads:
Class
A
drawers -
25 pounds
Class
B
drawers -
50 pounds
50 pounds
Class
C
drawers-
100 pounds
Class
D
drawers -
3.5.1.2.  Type II, classes 1 and 2 proof load capa ity  The type II,
class 1 work table proof load is 1,200 pounds. The type II, class 2 work
table proof load is 1,800 pounds.  Each shelf (across full length of table)
shall be capable of supporting a proof load of 600 prods. All loads shall be
uniformly distributed.
3.5.2.  Laid vibration l  The assembled work tables, loaded to their
respective proof load shall be capable of withstanding vibrations (simple
harmonic motion) of 1/16 inch amplitude (1/8 inch total excursion) at a
frequency of 600 cycles per minute (cpm) for a period of 1 hour in the
direction of the vertical axis.  The worktables shall show no structural
failures or defective welds.  The drawers, doors, and all working component
parts shall function smoothly and normally after vibration, under loaded and
unloaded renditions. The maximum deformation ( permanent set) of shelves and
drawer supports shall not exceed 1/8 inch from the originalrammel dimensions
t
af ter this vibrationl  All loads shall be uniformly distribute.
3.5.3.  Trammel dimensions.  Trammel points shall be establish on the
table legs and shelves (see Figure 3 ) prior to any testing. Measurements
shall be taken and recorded before loading the work table for testing. These
measurements shall be repeated, with the work table unloaded, and recorded
after the static load test and after the vibration test.
5

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