Graphite Alloy Stops the Sparking and Arcing

Aug. 21, 2008
A company making metal fasteners added an electrostatic paint line that gave managers grief almost as soon as it began operating.

The line uses steel baskets to hold 100-lb loads of small metal parts in a caustic cleaning solution, take them through primer pretreatment, then through application of 360 Vdc for electrostatic painting. Finally the baskets travel through a 350°F curing oven. The baskets had to turn and tumble, so they hung from a conveyor on a stub axle. But this axle-to-basket connection also had to carry the voltage needed for painting.

Once in operation, the poor electrical contact between the axle and baskets, coupled with the relatively high voltage, led to arcing and sparking. It was intense enough to eat away at the metal components, including entire sections of overhead conveyor chain. To solve the problem, Graphite Metallizing Co., Yonkers, N.Y., recommended a Graphalloy bearing in a cast-iron housing. The graphite/metal alloy conducts electricity well, so the new part made for better current flow, which stopped the arcing. The bearing could also withstand the caustic detergent and high temperatures.

A graphite-metal alloy bearing in a cast-iron flange solved arcing problems on an electrostatic paint line.

Sponsored Recommendations

From concept to consumption: Optimizing success in food and beverage

April 9, 2024
Identifying opportunities and solutions for plant floor optimization has never been easier. Download our visual guide to quickly and efficiently pinpoint areas for operational...

A closer look at modern design considerations for food and beverage

April 9, 2024
With new and changing safety and hygiene regulations at top of mind, its easy to understand how other crucial aspects of machine design can get pushed aside. Our whitepaper explores...

Cybersecurity and the Medical Manufacturing Industry

April 9, 2024
Learn about medical manufacturing cybersecurity risks, costs, and threats as well as effective cybersecurity strategies and essential solutions.

Condition Monitoring for Energy and Utilities Assets

April 9, 2024
Condition monitoring is an essential element of asset management in the energy and utilities industry. The American oil and gas, water and wastewater, and electrical grid sectors...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!