Steps involved in processing an order at cbf


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Review CASE: CIRCUIT BAORD FABRICATORS, INC (Chapter 6 pg. 177) Circuit Board Fabrications, Inc.

(CBF) is a small manufacturer of circuit boards located in California near San Jose. Companies such as Apple Computer and Hewlett-Packard use the company to make boards for prototypes of new products. It is important that CBF give quick and very-high-quality service. The engineers working on the new products are on a tight schedule and have a little patience with sloppy work or missing delivery dates. Circuit boards are a rigid flat surface where electronic components are mounted. Electronic components such as integrated circuits, resistors, capacitors, and diodes are soldered to the boards. Fabricating the boards requires CBF's numerically controlled (NC) equipment to be programmed. This is largely an automated process that works directly from engineering drawings that are formatted using industry standard codes. Currently, the typical order is for 60 boards. Engineers at customer companies prepare a computer-aided design (CAD) drawing of the board. An electronic version of the drawing precisely specifies each circuit trace, circuit pass-through holes, and component mounting points on the board. An electronic version of the drawing is used by CBF process engineer to program the NC machines used to fabricate the boards. Due to losses in the system, CBF has a policy of increasing the size of an order by 25 percent. For example, for a typical order consisting of 60 boards, 75 boards would be started through the process. Fifteen percent of the boards are typically rejected during an inspection that occurs early in the manufacturing process and another 5 percent of the remaining boards are rejected in final test. BOARD FABRICATION PROCESS CBF purchases circuit board blanks from a vendor. These boards are made from woven fiberglass cloth that is impregnated with epoxy. A layer of copper is laminated onto each side to form a blank board. The blank board comes from the vendor trimmed to the standard sizes that CBF's numerically controlled equipment can handle.

The following is a description of the steps involved in processing an order at CBF:

1 Order acceptance. Check to verify that the order fits within the specification of boards that can be produced with CBF equipment. The process engineer at CBF works with the customer engineer to resolve any problems with the order.

2 NC machine programming. CAD information is used to program the machines to produce the order.

3 Board fabrication. A Clean. Each board is manually loaded into this by the operator. The machine then cleans the boards with a special chemical. Each board is them automatically transferred to the coating machine. B Coat. A liquid plastic is deposited on both sides of the board. Following this process, an operator places the boards on a cart. Each cart, with a complete order of boards, is then moved immediately to the "clean room."......

Q: What recommendation would you make for a short-term solution to CBF's problems? ...

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