As previously mentioned, achieving accurate outer diameter (OD) control is straightforward with stable CNC processing. Typically, after CNC processing, the threads of a non-plated component must pass thread gauge inspections to meet quality control standards. However, for components that will undergo plating, the manufacturing and inspection procedures differ.

For our Swiss dental equipment supplier client, Overland must be especially meticulous with inspections. Here’s how we handle it:

Pre-Plating Adjustment: Based on the required plating thickness, Overland leaves additional material during CNC processing to account for the plating. We use pre-plated thread gauges for initial inspections. For example, if the plating thickness is 1-3µm, the major, pitch, and minor diameters of internal thread M13.2×0.3-6H should be +0.02/-0mm larger than the standard dimensions.

Pre-Plating Inspection: Before plating, the threads are inspected using an enlarged customized M13.2×0.3-6H +0.02/-0mm plug gauge.

Post-Plating Inspection: After plating, the internal threads must pass inspection with a standard M13.2×0.3-6H plug gauge.

External Threads: For external threads on plated components, a pre-plated ring gauge inspection is conducted after CNC processing, followed by inspection with a standard ring gauge.

Components must pass these inspections before they are approved for shipment.