Critical dimensions
We check fitted dimensions and hole positions from the drawing datums.
Direct CNC Manufacturer · Hangzhou, China
Precision CNC Machining
for Complex Custom Parts
3-Axis, 4-Axis & 5-Axis MachiningPrototypes & Low-Volume Production
Aluminum housings and complex multi-axis components, with surface finishing and dimensional inspection to your drawing.
ISO 9001 certifiedFrom 1 PieceLead time: 7–20 days
Precision parts for
equipment manufacturers
Aluminum housings and complex components with fitted bores and mounting faces.
Complex geometry
5-axis machining
for demanding shapes
Curved profiles and angled holes can be difficult to reach when they extend across several faces.
We review rotary positioning and cutter clearance, then choose locating surfaces that preserve the relationships between critical features across setups.
- Curved surfaces
- Angled features
- Multi-face machining
Aluminum & visible surfaces
Precision aluminum parts
for fit and finish
A housing, cover or panel must fit its assembly and meet the appearance requirements for its visible surfaces.
We review tool marks, edges and surface-finishing requirements alongside the dimensions that control assembly.
Explore aluminum machining
Quality & inspection
CMM & dimensional
inspection
Before production, we agree which critical dimensions to check, how to measure them and what to report, from the first article through final inspection.
Explore inspection & quality
Measurement methods
CMM, height gauges and optical measurement are selected to suit the feature and its specified limits.
Inspection records
We agree the scope of full dimensional inspection and CMM reporting for each part and order.
See the machining behind the part
View machining examples
5-axis machining of a multi-face part
Rotary workholding gives the cutter access to features on different faces.
Read the machining study
A 29-inch display housing
How a broad display-housing panel is supported and reached during machining.
Read the machining study
Turning followed by milling
How flats, holes and other milled features relate to a cylindrical part’s turned axis.
Read the machining studyMachining routes
for your drawing
View all capabilities5-axis machining
Angled faces and curved contours, with tool access and setup requirements reviewed for your drawing.
CNC milling
Pockets, flat faces, bores and hole patterns in custom blocks, brackets and housings.
CNC turning
Shafts, sleeves and fittings with stepped diameters, internal bores and threads.
- Machining
- 3-axis, 4-axis & 5-axis milling; CNC turning
- Typical parts
- Housings, impellers, blocks, shafts & fittings
- Materials
- Aluminum, stainless steel, brass, copper & engineering plastics
- Tolerance reference
- ±0.01 mm on selected critical features*
- Inspection
- CMM, height gauges & optical measurement
* Subject to review of the drawing, material, geometry, setup and measurement method.
Materials we machine
Explore materials
Specify the exact grade, stock condition and finish.
Working with LZZ
From the drawing
to your next order
- Drawing and requirements review
- Quotation and order confirmation
- Sample or first-article approval, where agreed
- Machining and surface finishing
- Full dimensional inspection & CMM reporting, protection and packing
- Delivery and repeat-order review
Contact us
Ready to discuss
your next part?
Send the drawing with the material, finish, quantity and destination. Let us know which features control the fit and what inspection records you need.
STEP, PDF and other supported files can be attached in the inquiry form. We send a first reply within 12 hours.
Manufacturing resources
View all resources
RFQ & ordering
RFQ checklist
The files and specifications needed for a quote, with a brief you can copy.
Technical guide
Choose a machining process
When a part needs turning, milling, several 3-axis setups or 5-axis access.
Technical guide
Specify material & finish
How treatment affects bores, threads and other working surfaces at final inspection.
Frequently asked questions
Can I order a single part?
Yes. Orders start from 1 piece. A drawing, material, finish and quantity help us price the work.
What should I include in an RFQ?
Include the drawing and revision, a 3D model where available, material grade and condition, finish, quantity, critical features, inspection records and delivery destination. Identify any requirements that are still undecided.
How long does production take?
Production takes 7-14 business days after drawing and order confirmation, including surface finishing. Shipping time is additional. The quotation sets the schedule for your quantity and requirements; sample reconstruction and drawing approval are separate stages.
How are inspection requirements agreed?
The drawing identifies critical dimensions and their limits. We settle the measurement methods, sampling and records with you before production; achievable tolerances vary by feature and part.
Can you work from a physical sample?
Yes. A sample can be the starting point. Wear, hidden features, material and function may need investigation before you approve the model and drawing. Reconstruction and drawing approval are separate from production.