Sunday, February 17, 2013

Powder Coating - Part II

Paul powder coated these pieces.

It was tricky. There was a problem. It's called Faraday's Cage.


Faraday, a really smart scientist from long, long ago, found that electrical charges accumulate on the outside of an object, but not on the inside. These metal parts don't look like a cage, but because there are parallel surfaces, they act like a cage, and the electrical charge (and powder) doesn't stick to the inner sides of the parallel surfaces. The powder coating bounces off the inner walls and jumps to the outside surfaces.

How did Paul get it to stick?

Paul heated the parts before painting, then he held the gun close to the inner surfaces, and before the powder could jump to the outside they melted from the heat and stuck. 

They look good, don't they.


No comments:

Post a Comment