Batch CNC Machining and WIP Control

The containers beside this CNC line represent work in process: parts that have a part number, lot, operation and inspection status. Keeping WIP close to the machine can support flow, but excess inventory hides problems and increases the quantity affected before a dimension trend is noticed.

Defining a practical batch

Batch size is influenced by customer releases, casting lot, machine setup, coating schedule and packaging. A very large batch reduces changeovers but can delay feedback. A smaller controlled lot allows early machining and inspection results to be reviewed before the remaining castings are committed. Huabo balances these factors for each repeat program.

Traceability through machining

• The incoming casting lot remains connected to the machining traveler or container.
• Machine, fixture and first-piece approval can be identified when required.
• Parts awaiting measurement are not mixed with released output.
• A nonconforming result defines which quantity and time period must be contained.
• Reworked parts retain a separate status until reinspection is complete.

Buyer information that shapes the control plan

State traceability depth, retention period for records, critical dimensions and any required capability study. Automotive or safety-related projects may require stronger lot and process records than general industrial hardware. The requirement should be agreed before production so container labels and inspection reports capture the necessary information.

Read about CNC machining, dimensional inspection and Huabo quality control.