Why CNC Machining Was Selected for the ABS Enclosure
The customer needed 50 functional units, but the design was still at the prototype stage. Producing injection mold tooling would have increased the initial investment and made later design changes more difficult.
The upper and lower enclosures were therefore CNC machined from ABS blocks. This allowed the customer to evaluate the product in the intended engineering plastic without committing to production tooling.
The enclosure included screen and button openings, internal mounting features, connector locations and mating edges between the two shells. These features were reviewed together with the assembly drawings before machining.
After CNC machining, the ABS surfaces were sanded and prepared for painting. Particular attention was given to the front panel, corners, recessed areas and enclosure joint because these features remained visible on the assembled product.
Nearly 30 Parts Using Different Manufacturing Processes
Each component followed a manufacturing route suited to its material, geometry and function.
| Component | Material | Process | Main requirement |
| Upper and lower enclosure | ABS | CNC machining and painting | Joint gaps and surface appearance |
| Display window | Transparent PC | CNC machining and high polishing | Clarity and edge fit |
| Custom buttons | Customer-specified material | Prototype sample production | Movement and clearance |
| Internal housing | Aluminum alloy | CNC milling | Mounting accuracy |
| Support brackets | Stainless steel | Sheet metal fabrication | Bend angle and hole alignment |
| Shafts and sleeves | Stainless steel | CNC turning | Diameter and mating fit |
| Small internal components | Brass | CNC machining | Dimensions and installation position |
Instead of managing these parts as separate orders, YS Rapid coordinated drawing revisions, production timing, finishing requirements and inspection points through one project team.
Polished PC Screen and Custom Buttons
The transparent screen was CNC machined from PC and then highly polished. Machining marks, scratches or uneven polishing would remain visible after installation, so surface quality and protective handling were important throughout production.
The buttons were custom-made according to the customer’s drawings. Their dimensions, exposed height and movement had to match the openings in the ABS enclosure as well as the internal operating structure.
During trial assembly, we checked the screen gap, button movement, front-panel alignment and clearance between the buttons and internal components. These checks were completed before the full batch reached the finishing stage.
Internal Metal Components
The aluminum housing was manufactured by CNC milling. Its mounting holes and mating surfaces positioned several internal components, making its relationship with the enclosure and brackets important.
Stainless steel brackets were produced by sheet metal cutting and bending. Bend locations, angles and hole positions were checked against the machined housing.
Stainless steel shafts and sleeves were completed by CNC turning, with attention to diameter and mating fit. Smaller brass components were also CNC machined according to the customer’s drawings.
Selecting the appropriate process for each part helped balance machining accuracy, production time and project cost.
Assembly Checks Before and After Painting
A part may meet its individual drawing dimensions and still create an assembly problem. Small dimensional variations can accumulate across the enclosure, bracket, housing and shaft positions.
Key components were therefore trial-assembled before painting. We checked:
· The fit between the PC screen and front enclosure
· Button clearance and movement
· Alignment of internal mounting holes
· Positions of the aluminum housing and steel brackets
· Fit between shafts, sleeves and mating parts
· Closure of the upper and lower shells
Checking these relationships before surface finishing reduced the risk of damaging painted parts during later adjustment.
After painting, the enclosure surfaces were inspected for scratches, dust, uneven color, incomplete edge coverage and paint build-up near openings. The finished parts were assembled again to confirm that the coating had not affected important mating areas.
Completing 50 Sets in Approximately Three Weeks
The three-week schedule required several processes to run in parallel. After reviewing the 3D models, 2D drawings and assembly information, plastic machining, metal milling, turning, sheet metal work and button prototyping were arranged under one schedule.
Parts that directly affected assembly were produced first for early fit checking. Painting began only after the main component relationships had been confirmed.
The project moved through drawing review, parallel part production, dimensional inspection, trial assembly, polishing, painting and final verification. Coordinating these stages allowed all 50 sets to be completed without waiting for every individual process to finish sequentially.
Rapid Prototype Machining in China
YS Rapid provides custom rapid prototype machining for overseas product developers, engineers and purchasing teams. We support projects involving machined plastic enclosures, precision metal components, custom buttons, cosmetic finishing and low-volume assembly.
As a China rapid prototyping company, our services include:
· CNC machining of ABS, PC, PMMA, POM and other plastics
· CNC milling and turning of aluminum, stainless steel and brass
· Sheet metal cutting and bending
· Custom silicone parts and prototype buttons
· Sanding, polishing, painting and printing
· Dimensional inspection and assembly verification
We manufacture individual prototypes, engineering test units, exhibition models and low-volume development builds. The process is selected according to the product design, material, quantity and development stage.
Request a Review for Your Prototype Project
For a similar electronic or medical device prototype, customers can send 3D CAD files, 2D drawings, a bill of materials, required quantities, finish specifications, color references and assembly information.
Our team will review the component relationships, recommend a suitable process for each part and identify possible machining, finishing or assembly concerns before production.
If your project requires a China prototype manufacturer to coordinate plastic enclosures, transparent components, precision metal parts and complete prototype sets, contact YS Rapid for a project review and quotation.
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