Shops blame a bad ground first for thin film, powder falling off before the oven, uneven film from part to part and sparks near the gun. It usually traces to hooks that have been through the oven too many times without stripping. A part with a bad ground can also hold enough charge to shock anyone who touches it in the booth. Fresh or stripped hooks and clean contact points fix it.
Half the rack is light and the other half's fine, you've got a bad ground on that crossbar.
Also heard as
- no ground
- poor ground
Related terms
Ground
The electrical path from the part through hooks, racks and conveyor to earth that lets charged powder stick.
Hooks
The wire hangers that hold parts on the conveyor and carry the ground connection.
Burn-off oven
A high-temperature oven that burns cured powder off racks, hooks and rejected parts.
Transfer efficiency
The share of sprayed powder that ends up on the part rather than in the booth.