tailieunhanh - Assembly Automation and Product Design

A first digit of 0-8 is for parts that can be fed easily (but not necessarily oriented) using conventional vibratory or nonvibratory hopper feeders. Parts having characteristics making them difficult to feed, irrespective of basic shape, are assigned a first digit of 9. Difficult-to-feed parts include those that are flexible, delicate, sticky, light, overlap, large, very small, nest, severly nest, tanlge, severly tangle or are abrasive. | Small Parts for Automatic Handling Choice of the first digit Parts can easily be fed but not necessarily oriented using conventional hopper feeders see note 1 Rotational parts see note 2 L D Discs see note 5 0 L D Short see note 5 cylinders 1 dP L D Long see note 5 cylinders 2 Triangular or square prismatic parts see note 3 L D Flat parts see note 5 3 ặl A R L D Cubic see note 5 parts 4 1 l l L D Long see note 5 parts 5 Rectangular parts see note 4 A B 3 A C 4 Flat see note 6 parts 6 A B 3 Long see note 6 parts 7 A B 3 A C 4 Cubic see note 6 parts 8 Parts are difficult to feed using conventional hopper feeders see note 1 9 55 396 Assembly Automation and Product Design Appendix D 397 Small Parts for Automatic Handling Choice of the first digit 1. A first digit of 0-8 is for parts that can be fed easily but not necessarily oriented using conventional vibratory or nonvibratory hopper feeders. Parts having characteristics making them difficult to feed irrespective of basic shape are assigned a first digit of 9. Difficult-to-feed parts include those that are flexible delicate sticky light overlap large very small nest severly nest tanlge severly tangle or are abrasive. 2. A part whose basic shape is a cylinder or regular prism whose cross section is a regular polygon of five or more sides is called a rotational part. 3. A part whose basic shape is a regular prism whose cross section is a regular polygon of three or four sides is called a triangular or square part. 4. A part whose basic shape is a regular prism is called a rectangular part. 5. L is the length and D is the diameter of the smallest cylinder that can completely enclose the part. 6. A is the length of the longest side C is the length of the shortest side and B is the length of the intermediate side of the smallest rectangular prism that can completely enclose the part. Rotational Parts Parts with a first digit of 0 1 or 2 THIRD DIGIT Centroid I Principal axis Transverse axis s

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