What You Need to Know About Cleaning, Filtering, and Maintaining Machine Tool Coolant

Learn how to find information and answers to your questions about various filtration options and how to determine the best options for your application. Hennig’s designers and other professional staff provide counsel and assistance as you select the right filtration solution to meet your specific application requirements.

Identify System Requirements and Factors Affecting Efficiency

Your first step: Evaluate your conveyor system requirements and factors that contribute to efficiency/uptime. Key factors include:

    1. Total cost/price; don’t overlook the cost of poor filtration and other issues that cause downtime
    2. Problems that shut down or slow machines and shrink efficiency – such as bacteria issues in coolant
    3. Range of options; understand filtration options before determining the best-in class selection for your specific application, whether you need a simple mesh filter box or a more complex system
    4. Ratings and reviews from machine tool builders for certain levels of filtration.

Filtration Options

As you match your filtration system selection to your requirements, consider ways to clean, filter, and maintain your coolant:

Cartridge filtration: This efficient alternative to conventional high-pressure and reverse-flow filters removes ingressed contamination before it flows downward to sensitive components. These simple, modular filters block pump-generated debris before it gets to servo or proportional valves. A high-pressure filter, it provides durability and consistently high performance.

Cyclonic filtration: This waste-free coolant filtration system removes particulates through centrifugal force. It eliminates the need for disposable paper or cartridge filters. Bubbles and foam are not produced. Contaminants, concentrated in the sludge pot, cannot return to the coolant tank once they are removed.

Bag filtration: Relatively inexpensive and readily incorporated in machine tool applications, bag filters provide solutions for removing swarf, small chips, and various particulates. Unfiltered liquid enters the housing above the bag and passes down through it. Solids contained in the bag are easily removed when the unit is serviced. Fluid bypass is prevented because the outside diameter of the filter bag seals radially against the housing inside diameter. A single cover gasket seals the opening. Covers can be installed and removed without tools.

Chip Disc Filtration (CDF): Hennig’s patented CDF filtration systems, compared to many competitors’ systems, offer the advantage that they can be used with a scraper belt or a hinged belt to remove fine, stringy, bushy and broken chips. Drum systems, by comparison, require two conveyors (a hinged belt conveyor and a scraper belt) when there are stringy chips. This dual installation increases maintenance cost and consumes added floor space.

Drum filtration: A drum rotates in a tub of liquid to be filtered. This filtration type prevents clogs in systems with slurries and liquids with a high solid content.

Magnetic filtration: This method is used to remove iron particles. A large magnet attracts and filters these particles from the system. It is suited to environments with ferrous, para-magnetic, and grinding medium issues.

(shown here in combination with a CDF filter)

Coolant skimmers: This mechanical system separates oil or particulates floating on the surface of a liquid.

Paper filtration: These systems cleanse various types of liquids (water, emulsions, aqueous solutions) of polluting solid particles. They can be used in machine tool markets as well as chemistry, food, painting, petrochemistry, glass, and industrial washing machine applications. Filtration models are possible for oil.

Critical Factors:

Weigh the capabilities for each filtration option, and consider factors such as:

  1. Quality and efficiency: better filtration, suited to particular customer requirements, reduces overall cost and contributes to increased uptime.
  2. Projected future requirements: consider changing/advancing automation and improvement plans, as well as current needs. design choices early in the selection process can provide for future expansion.
  3. Aftermarket support: Hennig provides skilled engineering/design, installation and system startup services.
  4. Replacement parts: our service centers supply needed parts for our systems, with global capabilities for meeting your needs.

Cost-effective, proven filtration solutions designed to meet your requirements support your company’s competitive advantage. Hennig’s experienced staff provide trusted technical solutions by teaming with our customers to create reliable, profitable results.

Connect with Hennig for the full support you need when you select the appropriate filtration system for your shop. We provide answers to your questions, whether you need a complete filtration system for your entire company or a less-complex system. 

For additional information about filtration options, contact:

9900 N. Alpine Rd., Machesney Park, IL 61115

Scott Cooley, Business Development Manager, Chip Conveyors/Filtration Systems

Don Kahler, Business Unit Manager, Conveyors