Wheel Selection Map for Zipper Hardware Polishing: Which Wheel for Which Stage — 抛光轮选型地图：粗磨/中磨/精磨各阶段用轮型号一览（可直接贴墙）.
This is a working reference, not theory: every table and checklist here is designed to be printed and used at the line. It complements the failure case studies published in the Technician Hub with the standard documents those cases eventually produced.
Common Mistakes and How to Avoid Them
| Mistake | Why It Happens | Practical Fix |
|---|---|---|
| 1. One wheel for all stages | Contamination of grit sizes ruins finish | Dedicate wheels per stage; colour-code arbors |
| 2. Pressure by feel | Heavy pressure burns zinc alloy | Standardise contact time and let compound cut |
Best Practices
- Colour-code wheels by stage
- Track compound use per thousand parts
- First-piece check under standard light
Polishing Stage Order
- Coarse stage - Remove casting skin (Do not skip stages)
- Middle stage - Remove coarse marks (Clean part between stages)
- Buff stage - Final brightness (Keep buff dedicated)
Dedicated wheel per stage | First-piece check under standard light
Wheel and Compound Selection Reference
Starting map for zinc alloy and brass hardware; adjust for part shape.
| Parameter | Reference | Why It Matters |
|---|---|---|
| Coarse stage | 120-180# sisal/cloth wheel | Removes machine lines and casting skin |
| Middle stage | 220-320# cloth wheel | Removes coarse-stage marks |
| Finishing stage | Cotton buff + fine compound | Sets final brightness before plating |
| Surface speed | 18-25 m/s | Too fast burns zinc; too slow glazes wheel |
The wall map ended wheel guessing
Scenario. New operators picked wheels by habit, finishing on contaminated wheels.
Action. A stage-to-wheel map went on the wall; wheels were colour-coded.
Result. Finish complaints dropped within two weeks and wheel spend became predictable.
Frequently Asked Questions
Why not one wheel per operator?
Cross-contamination of grit sizes puts coarse scratches into fine stages. Dedicate wheels per stage and colour-code them.
How do I know wheel speed is right?
18-25 m/s at the surface. Too fast burns zinc edges; too slow glazes the wheel and polishes nothing.
Do I need to clean parts between stages?
Yes. Carried-over compound drags coarse grit into the finishing stage.
Implementation Roadmap
| Step | Frequency |
|---|---|
| Wheel stage colour-coding live | Day 1 |
| Time standard measured per part family | Week 1-2 |
| Grade system shown to top buyers | Month 1 |
What Would You Like to Solve?
If you would like this checklist or template adapted to your own line and part mix, contact QLQ — we supply the full equipment and chemistry package along with the working documents that make it run.