Storing CNC coolants correctly is important for maintaining their performance and extending the life of your machines. Coolants help with lubrication, cooling, and rust prevention during machining, but improper storage can cause contamination and reduce their effectiveness.
By following proper storage practices discussed in this guide, you can store CNC coolants, avoid contamination, and rotate stock for better results.
Why Does Coolant Storage Matter?
The way CNC coolants are stored directly impacts their performance and lifespan. A CNC coolant is a mixture of water and chemicals that lubricate the cutting tools, reduce friction, and regulate temperature during machining.
Improper storage will however cause its composition can break down, leading to contamination, reduced effectiveness, and increased wear on your machines and tools. Over time, poor storage conditions can cause the coolant to lose its lubricating properties, affecting CNC machining.
Additionally, storing coolant improperly can lead to the formation of sludge, excessive foam, and separation of components. This can clog the CNC system, and cause inefficient cooling and inconsistent machining results.
Proper storage practices ensure that the coolant retains its necessary properties, performs consistently, and reduces the need for frequent replacement. In essence, proper coolant storage saves both time and money, preventing unnecessary maintenance and extending the life of your CNC machine components.
What Are the Best Containers for Storing CNC Coolants?
The right container will increase the CNC coolants longevity and stability. As a result, coolants should be stored in containers durable, airtight, and resistant to external factors like UV light, temperature changes, and contaminants. Examples include:
Closed Drums
High-quality plastic or steel drums with sealed tops are ideal for storing larger quantities of coolant. These drums should be made of materials that do not react with the coolant chemicals and can handle the weight of the liquid. A closed drum keeps the coolant free from contaminants, prevents spillage, and minimizes air exposure that could cause degradation.
Airtight Containers
Airtight, sealable containers prevent the coolant from being exposed to moisture, air, or dirt. Containers with tight-fitting lids, especially those that can be vacuum-sealed or have rubber gaskets, are best for keeping the coolant fresh. Airtight storage minimizes the chance of bacterial growth or contamination.
Corrosion-Resistant Containers
Since CNC coolants often contain chemicals that can corrode metal over time, using containers made from corrosion-resistant materials, such as high-density polyethylene (HDPE), is critical. These containers are non-reactive and ensure the coolant remains intact without corroding the container itself.
Coolant-Specific Storage Tanks
Some manufacturers offer tanks specifically designed for storing coolants. These tanks often have built-in filtration systems, levels to monitor the coolant amount, and pumps for easy dispensing. Investing in these specialized storage tanks can save time and reduce the risk of contamination during both storage and use.
How Do Temperature and Humidity Affect Coolant Lifespan?
Temperature and humidity are environmental factors that affect the CNC coolant quality and lifespan of CNC coolants. As a result precision CNC manufacturers avoid storing the coolant in fluctuating temperatures or in high-humidity environments as they can lead to a breakdown of the coolant mixture.
Temperature
Extreme temperatures, either too high or too low, can degrade coolant quality. Storing coolant at excessively high temperatures (>30°C) can cause evaporation of water content, leading to thicker, more viscous coolant that can increase friction and heat buildup during machining.
Conversely, freezing temperatures can cause the coolant to separate, leading to the formation of ice crystals that affect the coolant’s ability to circulate properly. It’s best to store coolants at a stable, moderate temperature (10°C to 24°C).
Humidity
High humidity levels can promote the growth of bacteria and mold in coolant, leading to contamination and odor. Coolants exposed to high humidity may also absorb moisture, which alters the concentration and reduces the coolant’s effectiveness.
Storing coolants in a cool, dry environment prevents excessive moisture accumulation and minimizes microbial growth, ensuring the coolant remains clean and effective.
To prevent the negative impact of temperature and humidity, consider storing coolants in climate-controlled areas with consistent temperature and low humidity. If that’s not possible, consider using airtight, insulated containers to mitigate environmental factors.
What Precautions Prevent Contamination During Storage?
Contamination is one of the leading causes of coolant degradation. To ensure the longevity of your CNC coolant, it’s essential to take precautions that prevent it from coming into contact with harmful contaminants. Below are some key practices for preventing contamination during storage:
Seal Containers Properly
Always ensure that containers are properly sealed to prevent contamination from dust, dirt, or foreign particles. Use airtight lids and ensure that the sealing mechanisms are intact to keep moisture, air, and debris out.
Keep Storage Area Clean
The area where coolant is stored should be kept clean and free from dirt, debris, and other chemicals that could mix with the coolant. Clean shelves, floors, and storage bins regularly to reduce contamination risks.
Label Containers Clearly
Proper labeling helps prevent mixing of different types of coolants or chemicals. Mark containers with the contents, date of purchase, and any relevant information to ensure that the correct coolant is being used and that expired coolants are replaced before use.
Avoid Contact with Contaminants During Dispensing
When moving coolant from the storage container to the machine, be sure to use clean equipment. Avoid placing anything dirty into the coolant to prevent contaminating the fluid.
Regularly Inspect Coolant
Periodically check the coolant for signs of contamination or degradation, such as discoloration, unusual odors, or the presence of sludge. Early detection of contamination allows you to address the issue before it compromises the coolant’s performance.
Tips for Rotating Stock to Avoid Using Expired Coolants
To maximize the lifespan of your CNC coolants and avoid using expired stock, implement a stock rotation system. Follow these tips to ensure that old coolant is used first and fresh coolant is stored properly:
First-In, First-Out (FIFO)
Adopt the FIFO system, which means that the first coolant purchased should be used first. Always place the newer stock behind the older stock in storage, ensuring that you are using the oldest coolant first.
Track Expiration Dates
Keep track of the expiration dates of each batch of coolant. Label containers with the purchase date or a “use by” date to avoid confusion and to ensure that the coolant is used within its effective period.
Inventory Management
Keep an updated inventory of coolant levels and expiration dates. This allows you to plan coolant replacements in advance and avoid running out of usable coolant.
Frequent Inspections
Regularly check the stored coolant for signs of degradation, such as changes in color, smell, or viscosity. Using degraded coolant can lead to performance issues and increased machine wear.
Conclusion
Storing CNC coolants properly helps maintain their effectiveness and prolong the life of your machines. By using the right containers, managing temperature, preventing contamination, and rotating stock, you can keep the coolant working well, reduce waste, and avoid unexpected downtime. These steps improve machining efficiency and cut costs over time.
