BRIGHTSTAR
PROTOTYPE CNC CO., LTD
+86 137 5010 5351
EN
June. 17, 2026
Have you ever needed to machine 5 to 50 CNC parts and been shocked by the unit price when you received the quote? A simple aluminum bracket that costs only $5 each for 1000 pieces might cost $50 each or more for 10 pieces.
This is not the supplier trying to overcharge you. It is determined by the cost structure of CNC machining. The unit price for small batch machining is indeed much higher than for large batches, but understanding the reasons can help you find ways to reduce costs.
This article will start with the cost structure of small batch CNC machining, analyze in detail why the unit price increases as quantity decreases, and provide you with proven cost reduction strategies to help you save 30% to 50% on 5-50 piece orders.
To understand why small batch machining is expensive, you first need to understand the cost structure of CNC machining.
Setup Costs Are Fixed
Setup costs include programming, tool preparation, fixture design, machine calibration, and other preparatory work. These costs are independent of the quantity machined. Whether you make 1 piece or 100 pieces, the setup cost is almost the same.
For small batch orders, these fixed costs must be spread over very few parts, causing the unit cost to rise sharply. For example, if the setup cost is $300, for 10 pieces it adds $30 per piece; for 100 pieces, it adds only $3 per piece. This difference is directly reflected in the unit price.
Machining Time Remains the Primary Cost Driver
The hourly operating cost of a CNC machine typically ranges from $50 to $150 per hour. The longer the machining time, the higher the cost. In small batch orders, each part still requires the same cutting time, and this cost does not decrease just because the quantity is smaller. Toolpaths, cutting parameters, and tool change times are the same for single pieces and small batches.
Material Costs Do Not Get Volume Discounts
When purchasing small quantities of material, suppliers typically do not offer discounts. Moreover, small batch orders often require cutting from standard size materials, resulting in lower material utilization and more waste. If you only need a small piece of aluminum plate, you may have to purchase an entire standard sheet, and the excess material becomes waste.
Inspection and Quality Management Costs Are Difficult to Spread
Quality management activities such as first article inspection, in-process sampling, and final inspection need to be performed for both small and large batch orders. These costs also need to be spread over a small number of parts in small batch orders, resulting in higher inspection costs per piece.
Lack of Economies of Scale
In high-volume production, efficiency can be improved through optimized toolpaths, dedicated fixtures, automated loading and unloading, etc. These optimizations require time and investment and are often not worth doing for small batch orders. Therefore, the machining efficiency of small batch orders is typically lower than that of large batches.
A Simple Cost Comparison
Suppose the programming and setup cost for a part is $300, material cost is $5 per piece, machining cost is $20 per piece, and inspection cost is $5 per piece. For 10 pieces, the unit cost is approximately $60; for 50 pieces, the unit cost is approximately $36; for 100 pieces, the unit cost drops to approximately $33. This is the fundamental reason why the unit price for small batch machining is much higher than for large batches.
Now that we understand where the costs come from, we can develop targeted cost reduction strategies.
This is the most effective cost reduction method, typically saving 20% to 40% of costs. Considering manufacturability during the design phase can avoid expensive machining problems later.
Add fillets to all internal corners to avoid sharp internal corners. The fillet radius should be at least one-third of the cavity depth, allowing the machinist to use larger diameter tools for faster machining.
Limit cavity depth to no more than 4 times the width. Cavities that are too deep require long tools, which have poor rigidity and are prone to chatter, forcing slower cutting speeds.
Avoid thin wall designs. Metal wall thickness should not be less than 0.8 millimeters, and plastic wall thickness should not be less than 1.5 millimeters. Thin walls vibrate easily during machining, requiring multiple passes with small depths of cut, significantly increasing machining time.
Use standard hole sizes and avoid non-standard drill sizes. Standard drills are readily available; non-standard drills require custom manufacturing, which is expensive and slow to deliver.
Limit thread depth to a maximum of 3 times the hole diameter. Threads that are too deep require special taps, take longer to machine, and are more prone to tool breakage.
Material selection directly affects machining time and tool life. 6061 aluminum is one of the most cost-effective materials for CNC machining, with fast machining speed and long tool life. 7075 aluminum has higher strength but also higher machining cost. If 6061 aluminum meets your strength requirements, do not choose 7075 or titanium.
For plastic parts, POM and ABS are much easier to machine than PEEK and cost significantly less. If your application does not require PEEK's high temperature resistance or chemical resistance, choosing POM or ABS can greatly reduce costs.
If you have multiple different parts to machine, requesting quotes and ordering them together is typically cheaper than placing separate orders. The machinist only needs to process one order, purchase materials once, and ship once. These savings are reflected in the quote. Combining orders also allows the machinist to better plan production and reduce idle time.
This is the most counterintuitive but most effective strategy. If your long-term requirement is 50 pieces, but you order 5 pieces first to "test the waters" and then reorder the remaining 45, you will actually pay for programming and setup twice. Ordering all 50 at once means only one setup cost, significantly reducing the unit cost.
In some cases, the unit price for 10 pieces may be 30% to 50% lower than for 5 pieces. If you have clear long-term demand, consider placing a larger order upfront, even if you do not need all parts immediately. They can be delivered in batches.
Post-processing operations such as sandblasting, anodizing, polishing, and silk screening add significant cost and time. If your parts are only for functional testing, you can temporarily skip these cosmetic treatments. Once the design is finalized, you can add surface finishing for production quantities.
At the same time, try to maintain uniform surface finishing specifications across the entire part. Avoid using multiple different finishing methods on the same part, as each switch requires additional setup and cleaning.
Tighter tolerances mean longer machining time and higher inspection costs. Only specify tight tolerances where functionally necessary. Use standard tolerances (such as ±0.125 millimeters) for other features.
When defining tolerances with GD&T, you can often specify looser tolerances to reduce costs. For example, if the positional tolerance of a mounting hole can be loosened from ±0.05 millimeters to ±0.1 millimeters, inspection time can be reduced by more than half.
Each setup takes time, and each repositioning can introduce errors. Design parts so that all features can be completed in a single setup whenever possible. If the part is too complex, consider splitting it into multiple components, machining them separately, and then assembling them.
Using 5-axis CNC machining can complete complex parts in one or two setups. Although the hourly rate is higher, it eliminates the time and errors of multiple setups.
If the parts are small, consider machining multiple parts from a single workpiece. For example, cutting multiple identical brackets from one sheet of material. This significantly reduces setup time and material waste, especially suitable for small batch orders. After machining, the parts are cut apart.
Tell your supplier your real requirements and budget. If certain features can be relaxed, let them know clearly. The supplier may offer more economical solutions based on your feedback.
For example, if you can accept an as-machined surface without additional polishing, the supplier can machine faster. Or if you can accept minor surface imperfections, the supplier can choose more economical toolpaths.
Some machinists have commonly stocked materials. If your parts can use these stock materials, you can save material procurement time and cost. Machinists typically buy materials in bulk at lower prices than retail, and some of these savings may be passed on to you.
Non-standard hole sizes, non-standard threads, non-standard tooling, etc., all require custom tools or additional operations, significantly increasing costs. Use standard sizes and standard threads whenever possible. Standard tools are readily available, low cost, and quick to deliver; custom tools may take weeks and cost several times more.
Deep cavities require long tools, which have poor rigidity and are prone to chatter, forcing slower cutting speeds. Holes with a depth exceeding 6 times the diameter are considered deep holes, and machining costs increase significantly. If deep holes are unavoidable, consider using gun drilling, but this requires specialized equipment and higher costs.
Thin walls vibrate easily during machining, requiring multiple passes with small depths of cut, significantly increasing machining time. Increase wall thickness whenever possible, or add ribs to improve rigidity. If thin walls are necessary, consider adding temporary supports and removing them after machining.
Machining text on CNC parts requires additional programming and machining time. If text is necessary, engraving (removing less material) is more economical than embossing (removing more material). For small batches, silk screening or laser marking may be more economical options because they do not require additional CNC machining time.
Q: What is the minimum order quantity for small batch CNC machining?
Many CNC machinists have no minimum order quantity and can accept single-piece custom orders. However, the unit price for a single piece will be the highest because all setup costs must be borne by that one piece. Even for single pieces, Brightstar welcomes cooperation. We provide single-piece machining services for many customers' prototype validation.
Q: How much is the unit price difference between 10 pieces and 50 pieces?
Typically the difference is between 20% and 40%. Because setup costs are spread over more parts, the fixed cost per piece is lower. The exact difference depends on part complexity and setup cost. Simple parts have a smaller difference; complex parts have a larger difference.
Q: Can I reduce costs by supplying my own material?
Sometimes. However, machinists can usually purchase common materials (such as 6061 aluminum, POM plastic) at lower prices because they get volume discounts. It is recommended to ask the machinist for their price before deciding. If you have special materials or surplus material, supplying your own material may save some cost.
Q: How can I get a quick quote for small batch CNC machining?
Providing complete 3D models and 2D drawings (with tolerances and surface finish requirements) significantly improves quote speed and accuracy. If possible, include notes about the application, critical tolerances, assembly relationships, etc. Brightstar typically responds to quote requests within 24 hours.
Q: Do you accept small batch orders?
Yes. Brightstar has no minimum order quantity and can accept small batch orders from 1 to 50 pieces. We provide free DFM reviews to help you reduce costs without sacrificing quality.
Small batch CNC machining is expensive primarily because setup costs cannot be spread over a large number of parts. Understanding this allows you to effectively reduce costs through the following strategies:
Optimize design to avoid hard-to-machine features. Choose easier-to-machine materials. Combine multiple parts into one order. Increase quantities appropriately to spread setup costs. Eliminate unnecessary surface finishing and tight tolerances. Communicate your real requirements fully with your supplier.
Brightstar specializes in providing small batch CNC machining services for customers in the automotive, medical, aerospace, and robotics industries. Whether you need 5 pieces or 50 pieces, we can help you control costs without sacrificing quality.
Ready to Reduce Your Small Batch CNC Costs?
Whether you need 5 prototypes or 50 pieces for small batch production, Brightstar can help you optimize your design, choose the right materials, and provide competitive quotes.
Email Amy: amy@brightstarprototype.com
Call or WhatsApp: +86 13750105351
Send us your CAD files and drawings for a free DFM review and quote.
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