Scope of this guide
Intermediate version: symptom-to-cause triage with the confirm-by column — find the variable, run one change, verify.
Series: finishing.com recurring questions answered with platingclub line practice. Parameters are industry-standard starting ranges — confirm against your supplier TDS.
Triage: symptom → confirm → first move
| Symptom | Likely root | Confirm by | First move |
|---|---|---|---|
| Plating where nothing should plate | Insulation chipped/cracked | Visual under load | Tag rack for rebuild |
| Thickness low on good positions | Current leaking to leaks elsewhere | Position thickness map | Find and retire leaking rack |
| Bath slowly heating / amps drift up | Leak paths multiplying | Amps vs parts trend | Audit racks, not the rectifier |
| Burn marks at rack tips | Contacts arcing | Tip condition photos | Dress contacts, check springs |
| Recurring after one rebuild | Rebuild quality or tape grade | By-rack failure history | Standardise tape spec |
Engineer notes
- One variable per corrective action; verify with the confirm-by column.
- Records beat memory: log every trial on the tank card.
- Two failed actions in a row is a senior call — escalate with your log.
Safety: racks carry live current in acid and alkaline baths. Lock-out before touching, insulate tools, and never straddle two tanks with a rack.
FAQ
Thickness low on good positions — where does current go?
Look for a neighbor rack leaking: bubbles on tape under load mark the spot.
Why do tips arc?
Worn, dirty or undersized contacts; arc tips over-work the rectifier and burn parts.
Tape grade — does it really matter?
Plating baths dissolve consumer tape in days; spec tape per chemistry.