Project Description
Some parts test a machine shop on a single feature. This one tests everything at once. Machined here at CNC Rapid from a solid block of 7075 aluminum, this integrated housing combines an internal ring gear, multiple concentric bearing bores, a flanged mounting port, thin-wall support arms, and dozens of threaded holes — all in one monolithic part, delivered in a clean as-machined finish.
Consolidating this many precision features into a single billet is exactly the kind of work that separates a capable CNC shop from an average one.
Why This Part Is Demanding
A part like this can’t be run in a single simple setup. It brings together several challenges that each require careful process planning:
- Internal ring gear — fine internal teeth cut inside a deep bore, where tool access, tooth-form accuracy, and concentricity with the housing all have to be right.
- Multiple concentric diameters — the stepped bearing journals and bores must stay true to a common axis, so shafts and bearings seat correctly and run without runout.
- Flanged bore and bolt pattern — the lower mounting port and its surrounding holes need tight positional accuracy to mate with the assembly.
- Thin-wall arms and lightening pockets — the extended support arms have to stay flat and dimensionally stable despite their slender cross-section.
- Dozens of threaded and precision holes — spread across several faces and orientations, each holding to position and depth.
Getting all of these features to agree with one another — across multiple faces and setups — is what makes this a genuine test of workholding, fixturing, and multi-axis machining.
Why 7075 Aluminum?
7075 is one of the highest-strength aluminum alloys available, offering a strength-to-weight ratio that rivals many steels at a fraction of the weight. For a structural housing that carries bearings and transmits load, that means real rigidity and durability without unnecessary mass.
It also machines cleanly, holding sharp edges and fine detail — which is exactly what an internal gear and tight-tolerance bores demand.
Machined to Spec, As-Machined Finish
This part is presented in its natural as-machined state — no anodizing or plating — so the quality of the surfaces and cutter work speaks for itself. Clean tool paths, crisp edges, and consistent finishes across faces are the result of sharp tooling, tuned feeds and speeds, and careful setup.
Holding concentricity across the stepped bores, keeping the thin arms flat, and locating every threaded hole accurately across multiple orientations takes precise fixturing and multi-axis machining. That’s exactly the kind of complex, multi-feature work the CNC Rapid team specializes in.
Ideal Applications
A precision housing like this is a natural fit for transmission, drive, and motion assemblies, where a single part must locate gears, bearings, and mounting interfaces together, including:
- Gearboxes and geared drive units
- Robotics and industrial automation
- Actuator and motor housings
- Aerospace, defense, and instrumentation
- Any application needing a rigid, lightweight, multi-feature structural component
Get a Quote on Your Next Project
From complex single-piece housings to production runs, CNC Rapid machines precision components in 7075 and other aluminum alloys, engineering plastics, and more — with a full range of finishing options available.
Have a drawing ready? Upload your files to CNC Rapid and we’ll get you a fast, detailed quote.
CNC Rapid is the manufacturing brand of DFM Rapid Limited.
