How to Save Money When Buying precision cnc machining services

CNC machining costs may vary depending on different factors, as discussed below:

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1. CNC Machine Costs

Machining cost changes with the change of the type of machine. Mainly, there are two types of machines that are being used for manufacturing parts using CNC machining, i.e. 3 3-axis and multi-axis machines.

The machine cost is also dependent on various factors like the size & weight of the machine, speed, power, and machine configuration.

The machining cost is calculated per hour, and the approximate cost of 3-axis CNC machining is around 40$ per hour, while for CNC turning machines, it is about 35$ per hour. The hourly rate of CNC machining using multi-axis machines is comparatively higher, ranging between 75$ and 125$.

Due to the involvement of more complex parts, CNC milling is more expensive than other types of machining operations. The machining expenditures increase with the increase in axes of the milling machines. For example, in the case of 5-axis machining, it costs more as compared to 3-axis machines.

2. Machining Time

The time required for the complete machining of any CNC machined part also plays a vital role in the calculation of the CNC machining cost. It is the rule of thumb that the more time taken for machining more the cost of the machining, which adds up to the basic setup cost.

Software like CAM, which requires a 3D CAD design model, can provide the estimation of the time required for the completion of the project. A project with a high level of complexity requires more hours to complete.

3. Labor

One of the advantages of CNC machining, as compared to manual machining, is that it reduces the number of laborers that are involved in manufacturing. The primary cost of the labor is of the expert designer who designs the 3D CAD design model for the machining, which increases with the complexity of the desired product.

This cost remains the same even if you are required to manufacture more parts, which reduces the per-part machining price. Then, the additional cost is of the labor that operates the CNC machine, which also increases with the increased hours required for complete machining of the part.

The extra cost is added to the labor cost if manual work is done to assemble, finish, and post-process the parts. The extra labor cost is also added if the finished product is being delivered from the machine shop to the client at a different location.

4. Material Costs

The material costs are also imperative in calculating the cost of CNC machining. The price of the final product made by a CNC machine depends on the type of materials from which you are required to make the product is made. You may be required to make part of plastic or metal materials.

As the plastic materials are cheaper and less durable, the machining cost of plastic or aluminum material is less compared to stainless steel. As in CNC machines, the material is removed from the solid blocks to make the 3D object. So, the required raw material will be more than the material of the final product.

The machinists buy the materials in the form of solid blocks and calculate the expense of the product per block. The most commonly used metals in CNC machining are aluminum, stainless steel, and brass.

Due to the economical prices and excellent machinability of aluminum, most machinists use aluminum in CNC machines.

Stainless Steel and brass result in higher costs due to poor machinability relative to aluminum. The titanium alloy is the most expensive of all these metals, so the machining cost of this metal will be the highest because it may require some special tools to manufacture the parts.

In case of the plastics, the price of the bulk material is less, the tools required also cost less, and less time is required to machine the plastics like Nylon, Delrin, and ABS.

5. Surface Finish and Post-Processing

After machining, most parts come out with scratches and marks that may not be ideal for direct use at the time. This is where CNC machining surface finishes come in. This extra process will help conceal those unwanted marks and apply a protective coating to the part.

Although these post-processing activities are important, they usually attract extra costs. This process is totally separate from CNC machining and may even need extra tools and materials to be completed. Some of the common finishes include sanding, coating, anodizing, painting, chroming, blacking, galvanizing, brushing, and water transferring.

6. Quantity

The volume of the order tremendously affects the cost of the final product. It is true that the overall cost will increase with the increase of required finished parts, but the cost per part will decrease.

7. Tooling Cost

In some cases of manufacturing, standard tooling is not useful, so custom tooling is required, which also increases the manufacturing cost using CNC machines.

8. Design Complexity

It can be difficult to reproduce some designs, especially when they have unique lines and shapes. Most times, manufacturers spend many hours programming and setting up the machine and cutting tools. This long process would certainly affect the final CNC machining price.

To achieve features like deep pockets and undercuts, you may also need to get special tools or multi-axis CNC machines, which leads to a higher cost. A simpler design with fewer tool changes and repositioning would always be more cost-effective than a detailed one.

Understanding Hourly Rates of CNC Machining

Most CNC manufacturers charge their cost per hour while factoring in other occurrences. So, the next time you get an estimate, know that your process is unique and your pricing may differ from the next person.

The key factors that can influence the hourly rates for CNC machining include:

Types of CNC Machines

The cost of operating each machine differs. For instance, the hourly rate of a standard 3-axis CNC mill should be between $40 – $80, while a high-end 5-axis CNC machining tool will set you back by $75 – $200 per hour. Other specialized tools like routers, lathes, and EDM machines also have their unique costs.

Tooling and Maintenance

The type of material you use and the consistent use of the cutting tool can lead to wear and tear. A CNC machining expert will also include the cost for tool repair, replacement, and maintenance in the hourly charges.

Machining Speed and Efficiency

A fast CNC machine will take less time to shape a tool and reduce the time you would naturally use in setting up and arranging the machine. This efficiency causes them to be more costly than other slower machines.

Labor and Setup Costs

Although CNC machining is largely automated, there is still a need for programmers and skilled operators to control the process. Complex projects that require multiple setups and detailed programming can increase the overall machining cost per hour.

Overhead and Shop Location

The operational overhead, like electricity, rent, and insurance, can affect its pricing. A CNC machine shop’s location also affects the hourly rates; shops in a developed area will certainly have higher rates than those in developing areas.

How to Calculate CNC Machining Cost?

Have you ever wondered why the CNC machining cost for each project is different? The secret lies in the details that go into the CNC machining cost calculation. From raw materials to labor costs and machine time, several factors affect the price.

If you’re looking to calculate CNC machining cost, ensure you:

Factor in Material Costs

Your choice of CNC machining materials would directly affect the amount of raw materials you will get. To calculate the material cost, you need to multiply the volume of the material you need by its cost per unit.

For example, you may need up to 20 kg of aluminum to bulk produce multiple parts, and it costs $10 per kg. With no extra preparation cost, the material should cost $200 ($10 x 20 = 200)

Determine the Machining Time

The amount of time you spend creating a part will definitely affect its price. You can, on your own, calculate the machine time by dividing the total length of the material by the machine’s cutting speed.

For instance, if the volume of material the machine will remove is 20 cubic inches and the average material removal rate is 0.5 cubic inches per minute, the total machining time for this process would be 40 minutes (20 cubic inches/ 0.5 cubic inches = 40).

Calculate the Machine’s Hourly Rate

Most CNC machines already come with a fixed hourly rate that factors in the type of machine, location, and the ease of operation. If the hourly rate for a machine is $100, you should have up to $300 to cover for 3 hours.

Include Labor and Setup Costs

Include the cost of hiring skilled labor to handle tasks like setup, programming, and production supervision. If you’re not sure, you can create an estimate based on the expected labor hours and the CNC machine shop’s hourly rate.

Account for Additional Expenses

Apart from the costs we’ve listed above, you should also prepare for additional expenses like surface treatment, tight tolerances, and other packages. Some special finishes may also lead to extra expenses.

Strategies for Reducing CNC Machining Costs

Before the start of the project, is calculated how much will be the CNC machine is calculated. While manufacturing the parts with the CNC machining process, one should try to minimize the machining cost.

There are some fixed requirements from the client that can’t be modified, but still, there are different methods to reduce the machining cost as follows:

1. Increase Batch Production

The more pieces you produce, the cheaper the cost of CNC machining will be. Before you start production, plan your schedule to minimize downtime and also use CNC programming to make bulk production easier. If you need repeat orders, work with a CNC machine shop that offers volume discounts.

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2. Be Wise in Material Selection

In order to reduce the cost of the product, special attention should be paid to the selection of materials. Materials with good mechanical properties will have lower processing costs. Keeping in mind the function of the product, you must choose the best available material that is easy to process. There is a difference in price between plastic and metal materials. Of course, you can follow the needs of your project and let your manufacturer give you more advice on material selection.

3. Use the Right Type of CNC Machine

To ensure you get the best results, you should use a machine that can effectively handle your material and give you high-quality parts. For instance, a standard 3-axis machine may be cost-effective, but it does not match the versatility of a 5-axis machine. There are different types of CNC machines that can easily fit your budget and preferences.

4. Reduce Machining Time and Tool Wear

The longer a part stays on a machine, the higher the machining price is likely to be. So, the goal is to reduce the machining time without producing a substandard part. You can achieve this by prioritizing CNC programming; use the right tools, and you’re good to go. If possible, you can forego unnecessary surface finishes.

5. Design Optimization

If some features of the product don’t affect the functionality, the design should be optimized to avoid machining those features, which will reduce the production cost.

5.1 Consider Hole Sizes and Profiles

When fabricating your CNC parts, you should ensure that your part features (e.g., holes, contours, slots, threads, etc.) can be made with standard toolings commonly available. Custom hole and thread sizes will need special tools, which can be quite expensive. There are many references about standard sizes used in the machining industry available on the internet.

5.2 Avoid Thin Walls and Deep Cavities

Thin-walled parts and deep cavities are very challenging to achieve through machining, and they are usually prone to dimensional inaccuracies. These parts’ features tend to cause vibration on the part and sometimes lead to the scrapping of parts.

5.3 Avoid Requiring Very Tight Tolerances

Parts with tighter tolerances are significantly harder to achieve, hence making them expensive. Only control a dimension if it is essential to the part’s overall functionality. One great piece of advice we can give you is to design your part to have one common reference point or datum. This will both help you and the machinist. First, you, to minimize the dimensional controls you need to put on a part, and second, the machinist, to lessen the inspection time, which also reduces costs.

5.4 Convert One Piece of a Complicated Part into Modular Components Instead

When one part gets too complex, it is advisable to split the whole part into multiple components to be assembled. This will make machining much easier and simpler. It significantly reduces set-up time, lessens machining operations, and optimizes machining time. This is a strategy commonly used by designers to promote a part’s manufacturability and lessen its fabrication cost.f

6. Consider CNC Machining Outsourcing

If you’re a small business owner who cannot produce parts on your own, CNC machining outsourcing can be a cost-effective solution for you. There are several CNC machine shops with the equipment and expertise to handle your production. Compare the prices of different suppliers to ensure you get the best balance of price and quality.

Looking for more tips to save the cost of CNC machining? Let’s check this video.

Understanding CNC Machining Costs

The Anatomy of CNC Production Expenses:

When diving into the realm of CNC machining products, it's essential to grasp where your money goes. A primary chunk of your expenses can be attributed to material costs. Depending on the types of CNC machined components, the material type can heavily influence the final price. 

Next, machine time comes into play. High precision machinery, especially when dealing with 5-axis CNC machines, can rack up costs due to the intricacies they cater to.

Labor is another significant component of the cost structure. It involves not only the hourly rate of skilled workers but also the time taken for tasks such as machine setup, inspection, and post-processing. 

Tool wear, often underestimated, is a recurring cost, especially when crafting complex parts like those used in motorcycles or the automotive industry. 

Lastly, overhead costs include utilities, facility rent, and machinery depreciation, which may vary based on production volume and scale.

Having a clear understanding of these costs is more than just accounting; it paves the way for strategic decisions. For instance, being aware of tool wear can guide you towards investing in high-quality tools for precision machining components, thereby reducing frequent replacements. Similarly, insights into material costs can lead businesses to explore bulk purchasing or material recycling.

The foundation of every quality CNC product lies in the selection of the appropriate material. Selecting the right material ensures the end product meets the required durability, strength, and finish specifications without incurring unnecessary costs.

For instance, while stainless steel is robust and corrosion-resistant, it might not be the best fit for every project, especially when considering the challenges of machining stainless steel 316. On the other hand, materials like aluminum might be more cost-effective and suitable for specific applications, especially when anodizing color is a consideration.

Material Type Material Name Characteristic Price Range (Per Kg) Metal Aluminum Lightweight, corrosion-resistant, good conductivity $5 - $10 Stainless Steel Strong, corrosion-resistant, shiny finish $10 - $15 Brass Malleable, corrosion-resistant, bright gold-like finish $8 - $12 Titanium High strength, corrosion-resistant, biocompatible $20 - $30 Copper High electrical conductivity, malleable, resistant to corrosion $6 - $10 Bronze Durable, corrosion-resistant, excellent for bearings $9 - $14 Zinc Ductile, corrosion-resistant, often used for die-casting $4 - $7 Tungsten Extremely hard, high melting point, dense $25 - $35 Plastic ABS Durable, heat-resistant, versatile $2 - $5 Polycarbonate High impact strength, transparent, heat-resistant $3 - $6 Polyethylene Lightweight, chemical resistant, low friction $1 - $3 Nylon Wear-resistant, flexible, low friction $4 - $7 PEEK High temperature resistance, chemically stable $50 - $70 PMMA (Acrylic) Transparent, UV resistant, aesthetically pleasing $3 - $6 POM (Delrin) High stiffness, low friction, excellent wear resistance $3 - $6 Teflon (PTFE) Chemically resistant, low friction, electrically insulative $10 - $20 PVC Durable, low cost, resistant to chemicals $1 - $3

Bulk Material Purchasing:

One strategic approach to reducing material costs is to buy in bulk or negotiate long-term contracts with suppliers. This method not only secures a steady supply of essential resources but often comes with price breaks and discounts. However, it's crucial to have an understanding of the materials often used in CNC, and resources like Worthy Hardware's guide can be invaluable for this.

Efficient Design Practices:

Simplifying Design Elements:

One of the primary factors affecting the cost of CNC machining products is the complexity of the design. An intricate design not only consumes more material but also demands additional machine time, leading to increased expenses. By streamlining design elements, one can reduce unnecessary complexities.

Keep the Design Simple:

The more intricate the design, the longer the machining time and the higher the likelihood of errors. A straightforward design not only reduces manufacturing time but also decreases the chances of production errors. This simplicity in design can result in substantial cost savings.

Provide Relief to Corner Pockets:

Sharp internal corners can be challenging to machine since standard milling tools are round. By adding a slight radius or relief to these corners, you can avoid the need for specialized tooling, thus reducing costs. Exploring the intricacies of CNC milling parts and their characteristics can provide further insights.

Deburr Edges:

Burrs are small pieces of material that remain attached to the edges after machining. By designing with deburring in mind and selecting machining processes that reduce burr formation, you can save on post-processing time and costs.

Avoid Thin Walls:

Thin walls can cause multiple issues during CNC machining, including vibrations that lead to inaccuracies. They also have a higher risk of breaking during the machining process. By designing parts with thicker walls or using material reinforcements, you can achieve a more robust component and decrease the chances of production errors.

Avoid Deep Pockets:

Machining deep pockets often requires specialized tools and extended machine times. By minimizing the depth of these pockets or considering alternate design solutions, like using inserts, you can cut down on both machining time and costs

Standardizing Components:

Custom designs are often more expensive due to the unique tooling requirements. Whenever possible, it's cost-effective to standardize components. Utilizing standard sizes and shapes, or even components from previous projects, can lead to substantial savings in both time and money. Such as strand fastenrs, gears, shafts,bushings, springs, connectors.

Design For Manufacturing (DFM) Principles:

DFM is a proactive approach to designing products that are not only functional and durable but also cost-effective to manufacture. By considering the manufacturing process during the design phase, designers can avoid potential pitfalls and streamline the production process. 

For instance, a part designed with unnecessary tight tolerances might result in higher costs due to the precision required. However, if these tight tolerances aren't critical for the part's function, relaxing them can lead to savings. An in-depth understanding of CNC machining parts tolerance can assist in making informed DFM decisions.

Reducing Machine Setup and Turnaround Time:

CNC machining products often require intricate procedures and multiple tool changes. The longer a machine sits idle during setup or the more frequently it has to be reconfigured, the higher the production costs. Efficient machine utilization can help drive down these costs. Here's how:

Batch Production:

Grouping similar parts or operations can dramatically reduce machine setup times. Rather than setting up a machine for each individual part, producing parts in batches minimizes these intervals, leading to significant time savings. This method can be particularly effective when crafting specific components, such as CNC machining motorcycle parts, where multiple identical units are required.

Multi-tasking Machines:

Advanced CNC machines can perform multiple operations simultaneously, such as milling and turning. Using multi-tasking machines that combine these processes in a single setup can eliminate the need to move the part to a different machine, thereby reducing turnaround time and potential errors. Dive deeper into the various types of machines by exploring the different CNC machine types available.

Automated Tool Changers:

Manual tool changes can be time-consuming. Modern CNC machines equipped with automated tool changers (ATCs) can switch between different tools rapidly without human intervention, ensuring continuous machining and reducing downtime. This automated feature not only speeds up the production process but also maintains consistency and quality across CNC machining products.

Reviewing Supplier and Vendor Contracts:

One often overlooked aspect of optimizing costs in CNC machining products is the relationship with suppliers and vendors. Active management and periodic review of these partnerships can lead to significant savings, ensuring that you get the best value for your expenditure. Here are some strategies to consider:

Periodic Renegotiation:

Contracts with material suppliers and service providers shouldn't remain static. The market evolves, and so should your agreements. By periodically renegotiating contracts, businesses can ensure they're getting the best possible prices and terms. Whether you're sourcing materials for CNC machining parts or partnering with logistical providers, staying updated with market trends and adjusting accordingly can be beneficial.

Exploring Alternate Suppliers:

Loyalty is commendable, but it's always a good practice to keep an eye out for alternative suppliers who might offer better prices, higher quality, or more favorable terms. Regular market surveys can help you identify potential partners who can deliver better value, be it for raw materials, tooling, or other essential components.

Bulk Purchase Discounts:

Volume can be a significant lever for cost savings. By consolidating purchases or committing to larger volume orders, businesses might be eligible for bulk purchase discounts. This strategy can be especially pertinent when sourcing core components, like custom CNC parts, where standardized specifications can lead to larger order sizes.

Maintain Open Communication:

Ensuring clear and open lines of communication with suppliers can yield unexpected benefits. Whether it's about getting early information on potential price hikes, availing of promotional offers, or collaboratively finding ways to optimize operations, a strong vendor relationship can translate to tangible cost savings.

Frequently Asked Questions (FAQs) about CNC Machining Products:

How do I ensure the best quality for my CNC machined parts?

Quality assurance starts with good design practices, choosing the right materials, and working with a reputable manufacturer. Regularly inspecting parts, maintaining machinery, and training operators also play a crucial role.

How do I choose the right material for my CNC project?

Material choice depends on the part's intended function, required strength, desired finish, and budget considerations. Worthy Hardware has a detailed guide on materials for CNC machining parts to help you make an informed decision.

Is there a difference between CNC milling and CNC turning?

Yes, while both are CNC machining processes, milling uses rotating cutting tools to remove material from a stationary workpiece, whereas turning involves a rotating workpiece and a stationary cutting tool. Learn more about CNC milling and CNC turning on our website.

How do I get started with CNC machining for my project?

Starting with CNC machining involves understanding your project requirements, selecting appropriate materials, designing or obtaining a CAD model of the part, and collaborating with a trusted CNC machining service provider, like Worthy Hardware, to bring your project to life.

If you want to learn more, please visit our website Prototype Injection Molding.