MIL-B-16029G
3.6.2 Arch. The front end components shall be of cast or rolled plate
steel construction. The arch shall be designed so that it will withstand its
proportionate share of the load during all operation cycles without
defomation or failure, provided it is not subjected to loading or digging
forces in excess of four times the breaking strength of the size dump rope
specified In table II. Ample clearance shall be provided for the flow
excavated material in and out of the bucket.
TABLE II. Dump rope size (inches).
3.6.3 Lip. The lip shall be cast manganese steel conforming to
MIL-S-17249, cast steel conforming to ASTM A 27 and ASTM A 148, or alloy steel
plate conforming to ASTM Designation A 514, or better. The lip shall form the
cutting edge. The extent of the lip shall conform to the manufacturer's
standard practice, and shall accommodate the teeth as specified (see 3.6.4).
All lips or cutting edges shall enable replacement of expendable components.
3.6.4 Teeth. Unless otherwise specified (see 6.2), manufacturer's
standard bucket teeth shall be furnished. When specified (see 6.2), teeth
shall conform to MIL-T-52176. The teeth shall be readily replaceable by the
use of standard tools.
3.6.5 Hitch plates. The hitch plates for attaching the drag chains to the
bucket shall be of one of the steels specified in 3.6.3 except for types I and
II buckets of size 100 and smaller, the steel may conform to ASTM A 27 and
ASTM A 148. The hitch plates shall provide not less than two positions for
the attachment of the drag chains as an aid in controlling the digging depth.
The plates shall be either riveted or welded to the bucket body.
3.6.6 Trunnion brackets. The trunnion brackets shall be of one of the
steels specified in 3.6.3. The trunnion brackets shall be accurately located
on the bucket body to provide proper balance, and shall be either riveted or
welded in place.
3.6.7 Runners. Renewable runners shall be provide and shall be either
riveted or welded to the heel of the bucket. The runners shall be of one of
the steels specified in 3.6.3.
3.6.8 Heel plates. Renewable or integral cast type heel plates shall be
provided. Renewable heel plates shall be either riveted or welded between the
runner bars at the heel of the bucket. The plates shall be of one of the
steels specified in 3.6.3.
3.6.9 Corner wearing shoes. All buckets shall have renewable cast corner
wearing shoes of the material specified in 3.6.3. Renewable wearing shoes
shall be bolted, riveted, or welded to the bottom corner.
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