MIL-A-21180D
purchaser of the proposed change prior to the first shipment of castings. The foundry shall submit
a sample production casting produced by the changed procedure for inspection for process
approval (see 6.2.1).
3.2.1.2 Surface roughness control approval. Where suface roughness is specified on a
drawing of a given casting or elsewhere in the acquisition documents (see 6.2.1), production of
this casting shall not begin until control of surface roughness is approved. Such control may be
established by any method of mold preparation or subsequent surface finishing appropriate for the
purpose, unless the method is expressly forbidden in the acquisition documents. The purchaser
shall be notified of the intended method for surface roughness control. Approval of surface
roughness control shall be based on the results of first article inspection, unless such inspection
has been waived (see 3.1). Where there is no waiver of first article inspection, the foundry shall
use the same surface roughness control method for the production castings as for the approved
first article castings. Where first article inspection has been waived, the foundry shall be required
to use a surface roughness control method acceptable to the purchaser. If it is necessary to make
any change in surface roughness control, the purchaser shall be notified of the proposed change
prior to the first shipment of production castings. The foundry shall submit a sample production
casting using the changed procedure for inspection for process approval (see 6.2.1).
3.2.1.3 Order of establishment of controls. When surface roughness is specified (see 6.2.1),
approval of foundry control shall be obtained prior to approval of surface roughness control.
When first article inspection for foundry control has not been waived, first article castings shall be
submitted for approval without finished surfaces, if surface finishing is to be performed subsquent
to casting.
3.2.2 Changes in foundry practice. A sample production casting, new first article, shall be
submitted for approval whenever one or more of the changes listed below occur(s). The
purchaser may waive this requirement after review of the change(s).
a. When a new pattern or permanent mold is made.
b. For each new pattern or cavity in multiple tooling.
c. When a duplicate pattern or mold is made.
d. When any change is made in gates, runner system, risers or chills.
e. When any change in the "as cast" shape is made.
f. When strength requirements are raised.
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