Precision Manufacturing From India
Precision CNC Machining of an Aluminium 7075-T6 Spacer for a US Customer
How Manufyn coordinated a 10-unit precision machining order using 3-axis and 4-axis VMC machining, with a reported order value of $25 and a 14-day turnaround.
01 / Project Overview
Manufacturing a Drawing-Specific CNC Machined Component
A US customer required a small batch of custom spacer components manufactured to an engineering drawing. The part combined a cylindrical body and flange with multiple holes, threaded features, recesses and defined dimensional requirements.
Manufyn coordinated the order using 3-axis and 4-axis Vertical Machining Centre (VMC) operations in India. The order covered 10 units at a total reported value of $25, equivalent to $2.50 per unit, with a reported turnaround of 14 days.
| Project parameter | Reported details |
|---|---|
| Component | Spacer |
| Drawing reference | 2022-P00063 V-1 |
| Material specified | Aluminium 7075-T6 or similar |
| Manufacturing process | 3-axis and 4-axis VMC machining |
| Order quantity | 10 units |
| Total order value | $25 |
| Calculated unit price | $2.50 |
| Turnaround | 14 days, as reported for this project |
| Customer market | United States |
02 / Engineering Challenge
What Makes This Spacer More Than a Simple Machined Part?
The supplied drawing identifies a flanged cylindrical spacer with a nominal envelope of Ø70 × 156 mm and a main body diameter callout of Ø63 mm with a 0/−0.05 mm tolerance. Other dimensions include selected ±0.10 mm and ±0.20 mm requirements.
The drawing also shows M4 and M6 threaded features, multiple holes, recesses and radiused transitions. Such features require consideration of workpiece orientation, cutter access, datum selection and the relationship between machined surfaces.
Key process-planning considerations
- Feature accessibility: Identify which surfaces can be machined in a conventional setup and which require a different workpiece orientation.
- Datum strategy: Establish suitable references for positioning the part and maintaining relationships between features.
- Tool access: Check cutter reach, hole access, pocket depth and potential interference with existing geometry.
- Thread requirements: Interpret the specified M4 and M6 features, including locations and applicable drawing notes.
- Revision control: The supplied drawing records revisions affecting feature depth, screw access and additional M4 holes. Manufacturing must use the approved revision.
These considerations illustrate why a reliable CNC machining quotation should be based on the engineering drawing and 3D CAD model, not solely on the component’s external dimensions.
Related guide: How to Read a CNC Machining Drawing .
03 / Manufacturing Process
3-Axis vs 4-Axis VMC Machining
The project used both 3-axis and 4-axis VMC machining. The appropriate machining configuration depends on the geometry, accessibility of individual features, workholding strategy and required relationships between surfaces.
3-Axis CNC Milling
A 3-axis machining centre moves the cutting tool or workpiece along X, Y and Z. It is suited to accessible profiles, faces, pockets and drilling operations that can be completed in the selected setup.
Its effectiveness depends on how the part is fixtured and whether the required features can be reached without repositioning the workpiece.
Read the 3-axis CNC machining guide →4-Axis CNC Machining
A 4-axis VMC adds a rotary axis to conventional X, Y and Z movements. Depending on the machine configuration, this can allow the workpiece to be indexed or rotated to reach features distributed across different faces.
Four-axis machining can reduce repeated manual repositioning when the component and fixture are suited to rotary-axis operations. The benefit depends on the actual setup and programmed toolpaths.
Explore 4-axis CNC machining →Why process selection matters
Using more axes is not automatically better for every component. The manufacturing objective is to select the simplest suitable process that can meet the drawing, production quantity, cost target and delivery requirement.
For low-volume CNC machining, setup count, workholding, cutter access and programming effort can have a significant effect on total manufacturing cost.
Continue learning: CNC Machining Resource Hub and Aluminium CNC Machining in India .
04 / Material Engineering
Machining Aluminium 7075-T6
Aluminium 7075-T6 is a high-strength aluminium alloy used in applications where strength-to-weight performance is important. It can be suitable for demanding mechanical components, fixtures and specialised industrial equipment, subject to the design’s material and service requirements.
CNC machining considerations include cutting-tool selection, chip evacuation, workholding rigidity, heat management and dimensional stability. The optimal machining parameters depend on the machine, tooling, component geometry and required finish.
Material selection must also account for corrosion exposure, fatigue loading, surface treatment, joining requirements and the intended operating environment.
Related resource: Aluminium Machining in India .
05 / Cost Engineering
Understanding the Cost of Low-Volume CNC Machining
The reported total order value was $25 for 10 units. Dividing the order value by the quantity gives a calculated unit price of $2.50.
This figure relates to this specific order and should not be interpreted as a standard market price for every aluminium 7075-T6 component. CNC machining quotations vary according to geometry, material, tolerances, setup requirements and the agreed commercial scope.
Factors affecting CNC machined part pricing
- Raw material grade, stock size and material utilisation.
- Number of setups and fixture requirements.
- Programming time and toolpath complexity.
- Machine cycle time, tool changes and material removal.
- Hole patterns, threads, pockets and multi-face geometry.
- Inspection requirements, reporting and material traceability.
- Order quantity, packaging and agreed delivery terms.
For a small batch, setup and programming can account for a larger share of total cost than in a high-volume production run. Buyers should therefore compare quotations using the same drawing revision, material specification, inspection scope and delivery terms.
Learn more: CNC Machining Resource Hub and Cost Negotiation in Manufacturing .
06 / Delivery Planning
14-Day Turnaround for a US Manufacturing Order
The reported turnaround for this project was 14 days. For international manufacturing, it is important to define whether lead time means order release to dispatch, manufacturing completion or delivery to the customer’s facility.
A typical CNC manufacturing workflow may include drawing review, quotation approval, material procurement, programming, setup, machining, inspection, packaging and dispatch. International freight may require additional time depending on the agreed shipping terms.
A reliable lead-time commitment should account for material availability, machine capacity, process complexity, inspection requirements and transport arrangements.
Related guide: Lead Time Reduction for Manufacturing .
07 / Quality Engineering
Dimensional Inspection and Quality Planning
Inspection requirements should be derived from the released engineering drawing and the customer’s acceptance criteria. For a component with cylindrical features, a flange, hole patterns and threaded features, a project-specific plan may cover:
- Overall dimensions and specified diameters.
- Flange dimensions and relevant face relationships.
- Hole sizes, locations and mounting patterns.
- M4 and M6 thread conformity.
- Pocket depths, radii, chamfers and edge conditions.
- Material identification and documentation, where required.
Measuring instruments must be appropriate for the dimension, tolerance and feature accessibility. Depending on the requirement, methods can include micrometers, bore gauges, height gauges, thread gauges or coordinate measuring machines.
Actual conformity must be established using measurement results against the approved drawing. Inspection reports and material certificates should only be claimed when project records are available.
Explore: CNC Datum Selection and CNC Work Coordinate Systems .
08 / Global Procurement
CNC Machining in India for US Manufacturers
Working with a manufacturing supplier in another country requires more than competitive pricing. Buyers need clear communication, drawing revision control, technical clarification, production coordination and agreement on quality requirements.
Manufyn helps international customers coordinate manufacturing requirements with suitable Indian suppliers. Depending on the project, this can involve RFQ review, supplier capability assessment, commercial coordination, production follow-up, quality planning and shipment coordination.
This case study provides a specific reference point: a 10-unit custom spacer order for a US customer, manufactured using 3-axis and 4-axis VMC machining, with a reported order value of $25 and a 14-day turnaround.
Explore our manufacturing case studies and technical Resource Hub for additional manufacturing examples and engineering guidance.
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Project figures reflect the information provided for this case study. The $2.50 unit price is calculated from the reported $25 total order value for 10 units. Material grade, inspection outcomes, freight inclusion and the precise definition of the 14-day turnaround should be verified against project records before making additional performance claims.