How Much Does It Cost to Run a CNC Machine Per Hour?

Understanding CNC machine operating costs is essential for machinists and factories who want to optimize production efficiency, achieve higher ROI and make informed equipment investment decisions.

This guide examines the hourly costs of operating a CNC machine, the measurable variables that inform these costs, as well as the tricks you can use to reduce operational expenses.

Why Calculate the Hourly Costs of Operating CNC Machines

Many workshop owners looking to invest in CNC machines focus primarily on the initial investment cost. While their focus is justified, it must be stated that focusing on the resulting operational costs is equally important.

By keeping updated on CNC machines’ hourly operational costs, you are in a better position to increase profit margins and consequently maintain efficient manufacturing. Calculating the hourly costs of operating a CNC machine can help you;

· Protect Profit Margins

Without a deep understanding of the operational costs, you can hardly tell when your CNC machining services are operating at a loss. Constantly calculating the hourly operational costs of a CNC machine helps uncover hidden costs, thereby allowing you to quote accurate prices for services rendered or components manufactured.

· Price Jobs Accurately

Determining the hourly cost of running a CNC machine helps estimate the true value or cost of a fabricated component or part. It allows you to factor in the desired profit margin, consequently ensuring that all machining operations do not run at a loss.

With a clear picture of a CNC machine’s hourly operational expenses, you can avoid underpricing or overpricing key components. Underpricing is likely to result in reduced profit margins or even losses, while overpricing is likely to drive away buyers.

· Increase Manufacturing Efficiency

Monitoring hourly operating costs helps manufacturers identify inefficiencies and improve resource utilization.

For instance, when calculating hourly operational costs, at times you may realize that the electricity cost can be significantly higher than anticipated. With this information, you can cut down on power consumption, ultimately broadening profit margins.

Factors Determining CNC Machining Operating Costs

Cost of Components of CNC Machine Operation

· Machine Depreciation

With each passing hour, CNC machining equipment loses a little bit of value as long as it is in operation. However, typical CNC machines maintain their value for ages. To calculate a CNC machine’s depreciation rate, simply use the following formula;

This means that if you bought a CNC machine with a useful lifespan of 5 years for $200,000, its annual depreciation would be $36,000 if the machine were left running for 20,000 hours per year.

· Labor Costs

Despite CNC machines being largely computer-controlled, they require some degree of human input. This starts with CNC machine installation, followed by machine set-up and CNC programming. CNC machines also necessitate human operators to oversee the machining processes. When calculating the accrued labor expenses, do not forget to factor in personnel salaries, insurance, and accrued benefits.

· Electricity Consumption

Power-related bills account for most of a CNC machine’s operational costs. The equipment requires power to execute varying machine operations. It also requires energy to power incorporated systems, including the air compressor and the dedicated cooling system. For most CNC machining operations, this sums up to between $1 and $2 per hour.

· Tooling Costs

When it comes to tallying CNC machining operational costs, tooling costs are often overlooked, and this results in inaccurate pricing. So, when calculating your hourly CNC machine operating costs, make sure you factor in the cost of machining tools in use. Additionally, do not forget to account for the resulting tool wear and the consumables used to facilitate the smooth operation of your cutting tools.

· Maintenance Costs

CNC machining equipment demands frequent and proactive maintenance throughout its life cycle. This includes thorough cleaning, replacement of worn-out components, and recalibration. Practicing preventative maintenance mitigates the escalation of simple hitches into bigger problems. This will help reduce CNC machine maintenance expenses significantly.

· Facility Overhead

Costs such as workshop rent and license fees may be overlooked when calculating hourly CNC machine operating costs. However, they have a huge impact on the overall operational expenses.

Production Factors that Increase CNC Machining Costs

· Type of Material

CNC machines are compatible with numerous materials, hence, they feature prominently in most industries. However, machining workpieces made from certain materials demands extra input, and this tends to increase the operating costs of CNC machining.

Drilling a titanium workpiece, for instance, can cost nearly twice as much as machining soft materials like aluminum. The table below illustrates how CNC machining materials used to make different parts impact the overall costs.

· Part Complexity

Components or parts with relatively more complex geometries command a higher price than simple parts. This is mainly because machining complex details demands more expertise and reinforced tools.

As a matter of fact, it demands advanced CNC machines, which are comparatively costlier to acquire. This ultimately drives up the cumulative operating costs of CNC machining. This table illustrates how part complexity or simplicity impacts your CNC machine operating costs.

· Tolerance Requirements

Aerospace CNC machining requires tight tolerances, unlike general CNC machining as required by ISO 2768. Machining parts with tight tolerances requires specialized equipment like a Swiss CNC machine and specialized training that may translate to higher operational costs.

This only drives your operating expenses higher, as is illustrated by the table below.

· Surface Finish Requirements

In some instances, CNC machining includes post-machining operations meant to raise the aesthetic value of the finished component. For instance, automotive parts may be anodized and coated with a layer of paint to enhance their corrosion resistance and beautify them. These surface finishing processes consume extra resources and expertise, ultimately driving the overall operating costs higher.

· Automation Level

Higher automation levels generally help reduce the operating costs of CNC machines in numerous ways. First, automation eliminates the need for numerous operators, who may demand high salaries, wages, and benefits.

Secondly, it reduces unexpected downtime significantly by utilizing predictive maintenance. This explains why highly automated CNC machines are cheaper to run compared to manual lathe machines.

Estimated Hourly Cost of Running Different Types of CNC Machines

Hourly Cost vs Cost Per CNC-Machined Part

The hourly cost of operating a CNC machine paints a clear picture of all costs incurred when the machine is running for an hour. The cost per machined part, in contrast, quotes the final price according to a finished piece.

This price takes into consideration the hourly operating costs as well as your desired profit margin. Therefore, the cost per CNC-machined part tells you how much you should sell the finished components.

Formula for Calculating the Hourly Cost of Operating CNC Machines

The cumulative hourly operating cost factors in numerous costs, ranging from raw material procurement to facility overhead costs. To calculate the hourly cost of operating a CNC machine or workshop, use the formula outlined below.

Hourly CNC machine operating cost = (depreciation + all operating costs) ÷ total productive hours.

How Factories Can Reduce CNC Machine Operating Costs

Factories running at a loss or with small profit margins can turn their fortunes around by simply cutting down on their hourly operating costs. Here are four ways to reduce operating costs while improving profit margins.

• Preventive Maintenance: Practicing proactive maintenance helps maintain profitability and sustainable operations to prevent unplanned downtime. This saves you a fortune in replacing prematurely worn-out CNC machine parts.
• Automation: CNC machines with a high degree of automation can run for up to 24 hours without necessitating human intervention. This helps you cut down on personnel wages, salaries, and benefits.
• Better Scheduling: Having a well-illustrated and pre-planned calendar detailing your scheduled machining operations can help you reduce operating costs by eliminating unnecessary downtimes.

FAQs

Is a 5-axis CNC machine worth the higher operating costs?

Yes. Whereas a 5-axis CNC machine may incur relatively higher operational costs, it promises higher profit margins. This is because this machine can fabricate premium-quality parts with complex geometries and polished finishes, which can generate higher profit margins.

Which CNC machine has the lowest operating cost?

Desktop CNC machines typically have the lowest operating costs due to their small size and simplicity.

How much electricity does a CNC machine consume?

The power consumption of CNC machines is primarily determined by the machine’s level of automation. Fully automated machines consume relatively more power, approximately double the power consumed by simple CNC machines.

Is CNC machining profitable for small-scale manufacturers?

If run properly, both small and large-scale CNC machining workshops can be quite profitable. The key to running a profitable CNC machining workshop lies in monitoring and tracking hourly operating costs and reducing them.

Partner with TSINFA and Optimize Your CNC Machining Cost

Lowering CNC operating costs without sacrificing productivity is not about cutting expenses, but investing in reliable equipment and partnering with an experienced manufacturer. Whether you are upgrading or investing in a new machine, TSINFA offers high-performance CNC machines and customized manufacturing solutions to increase productivity, guarantee accuracy and long-term profitability.

If you are looking for a cost-effective solution – contact our CNC machining experts now.