CNC Performance Slipping? Here’s How to Fix It

If your CNC's performance isn’t what it used to be, it’s often down to a few key issues. Addressing these can save you time and money while improving machine precision. But what causes performance issues, how can you prevent them, and what is the real cost of these interruptions? Continue reading to get to the root of the problem with expert CNC tips. Learn how to extend cutter life, minimise costs, and keep your operations running at peak performance. Because when CNC machines are down, nothing gets done – and no one can afford that!

5 main reasons why CNC performance might be slipping

1. Lack of CNC Maintenance

A poorly maintained CNC machine is prone to breakdowns and inconsistent performance. Regular preventive maintenance for CNC routers is essential. Neglecting to clean, lubricate, and inspect your machines can lead to debris build-up, poor alignment, and even mechanical failures. Following a maintenance schedule ensures your machines operate as intended, saving you big money in the long run. Download our suggested maintenance checklist here to avoid potential failures and minimise unplanned downtime and costly repairs.

2. Incorrect Feeds and Speeds

Failing to match the correct feeds and speeds to the material or cutter can cause excessive wear, vibration, and heat. This shortens the cutter’s life, causes tool breakage and impacts cutting quality. Matching feed speeds and RPM is one of the first things you must look for. Calculate your feed & speed online and avoid problems like burnt up tools or rejected parts.

3. Worn Collets

Did you know over 80% of cutter breakage is caused by worn collets? Collets hold your cutters in place, and when they’re worn or tired, they can’t grip the cutter properly. This leads to chatter, poor surface finishes, and cutter breakages. Replace collets regularly (every 400-600 working hours) to maintain optimal performance.

You need good, clean collets to get the best out of your cutters. Watch our instructional video on collet maintenance:

4. Spindle Misalignment

Even the slightest amount of debris on the spindle can negatively impact machining accuracy and cause cutting-edge runout. A misaligned spindle results in uneven cuts, increased cutter noise, increased stress on the cutter, and reduced precision. Regular spindle alignments are critical for the accuracy you need. Conducting minor checks daily or at the end of each shift costs far less than fixing a major issue. Spotting problems early prevents expensive repairs and machine downtime. 

5. Poor Cleaning and Lubrication Practices

CNC machines may not necessarily require extensive lubrication, but failing to follow the manufacturer’s guidelines can lead to breakdowns. Bearings, pumps, oscillating knives, and rack systems all need regular lubrication to operate smoothly.

Without high-quality lubricants, components wear faster, affecting performance and tool life and increasing the risk of damage. Cleaning accessories, such as dedicated wipers or brushes, can help remove debris and contaminants effectively.

How Much Does It Cost You Every Time a CNC Cutter Breaks?

A broken tool isn’t just a small expense. It leads to:

• machine downtime
• the cost of a replacement tool
• time spent on investigation and diagnosis
• the vital production time lost to removing, replacing, and setting up the new tool
• replacing damaged workpieces or boards
• disruption to factory tasks and workflow

As you can see, the real cost of a broken cutter could easily exceed its actual price several times over. Proper CNC maintenance, matching feeds and speeds and correct cleaning and lubrication practices can significantly reduce these incidents, saving you time, money, and frustration.

Reduce cost, maximise your budget and cutter life

Don’t wait for issues to arise. Use these actionable tips to reduce costs and get the most from your CNC machine:

1. Invest in Preventive Maintenance
   Regular servicing, cleaning, and inspections save money in the long run. Follow a consistent preventive CNC maintenance schedule to catch small issues before they become costly problems.
2. Monitor Cutter Wear and Replace Worn Components
   Inspect cutters, collets, and spindles regularly for signs of wear. Replacing worn tools and components before failure prevents further damage to the machine and ensures consistent CNC performance.
3. Keep Feeds and Speeds in Check
   Optimal feed speed and RPM depend on various factors, including the material and cutter type. Incorrect settings not only wear out tools but also damage materials and machines.
4. Use High-Quality Lubricants and Cleaning Accessories 
   Clean all parts regularly to remove debris and contaminants. Invest in premium specialised lubricants and cleaning tools like wipers or brushes to protect your machine and extend its lifespan.
5. Calibrate Your Machine Periodically
   Regular calibration ensures precision, accurate cuts, and reduced wear. This is especially important for high-precision applications where even minor inaccuracies can lead to significant and unacceptable defects.
6. Train Your Team
   CNC operators and factory managers should know how to spot early warning signs, such as unusual vibrations, noise, or poor cut quality. Training your team helps catch issues before they escalate.

CNC Maintenance Checklist

Following a consistent CNC maintenance checklist ensures nothing is overlooked. Staying on top of CNC maintenance doesn’t have to be complex.

Our expert team at Tungsten & Tool has created a free, downloadable CNC Maintenance Checklist to help you keep track of daily, weekly, monthly, and annual maintenance tasks. Download the checklist here to ensure your machines stay efficient and reliable for years to come!

Partner with a Specialist

Maintaining your CNC machine doesn’t have to be overwhelming. With the right schedule, tools, and guidance, you can avoid costly repairs, reduce cutter replacements, and maximise your budget.

At Tungsten & Tool, we’re here to help. As specialists in high-performance cutting tools and CNC maintenance, we can guide you through troubleshooting or selecting the best tools for your needs. If you have questions about CNC maintenance or tool performance or need advice on optimising your machines, contact us today. Our experts are ready to help you fix your CNC issues and keep your business running smoothly.

Feel free to reach out to us at 0800 488 647 or sales@tungstenandtool.co.nz for more information.