Rework Cost & Root-Cause Analysis in Gas Stove Assembly

Rework is the silent profit killer in any assembly line. Every stove you take apart and rebuild is labor and parts spent twice, with zero revenue for the second pass. The fix is not to work harder — it is to find the true cause of each defect. Here is how root-cause analysis reduces rework.

The True Cost of Rework

Rework costs far more than the worker's extra time. It consumes replacement parts, disrupts the line rhythm, delays shipment, and — worst of all — hides the underlying problem so it repeats on the next batch. A small defect repeated hundreds of times becomes a large loss.

Root-Cause Analysis in Practice

• Track defects by station — record where each defect is caught so you know which step is failing.
• Ask "why" five times — a loose gas connection may trace back to a worn torque driver, not a careless worker.
• Classify causes — material, method, machine, or manpower. Most recurring defects are method or tooling problems.
• Fix once, standardize — correct the process, then update the work instruction so the fix becomes permanent.

Common Assembly Root Causes

In gas stove assembly, frequent culprits include wrong nozzle sizing, inconsistent torque on gas fittings, misaligned ignition electrodes, and parts damage from poor kitting or handling. Each has a specific, correctable cause.

Build Quality In, Not Just Inspect It Out

THREEMI's CKD support includes assembly guidance that emphasizes process control — helping you design stations and work instructions that prevent defects rather than catch them. Combined with proper testing equipment, you drive rework down and first-pass yield up.

About THREEMI

THREEMI is the export brand of Shenzhen Sanmi Manufacturing Co., Ltd., a professional gas stove and kitchen appliance factory in Guangdong, China. With 400+ employees, a 20,000㎡ production facility, and an annual output of 3 million units, we serve wholesalers, distributors, brand owners, and e-commerce sellers in over 30 countries. Our factory is certified ISO9001, CCC, CE, UL, GS, ETL, NF, and SASO.

Start Your Local Assembly Line with THREEMI

We supply complete gas stove CKD (Complete Knock Down) kits, plus assembly guidance, worker training support, and equipment purchasing advice — so you can build a reliable local manufacturing operation. Contact us to plan your CKD program.

WhatsApp: +86 186 7003 0673
Email: logan@threemi.com
Website: www.threemi.com