About This Part
A mounting plate is the unsung backbone of every assembled machine. It carries bolted loads, aligns components that must sit exactly where the drawing says, and stays flat for years after installation. When a plate is out of flat by even a few hundredths of a millimeter, every bracket, sensor or actuator attached to it inherits that error. Misalignment shows up as binding linear rails, leaking seals, bearing preload errors, or optics that will not hold calibration — problems that rarely trace back to the plate itself during field troubleshooting. This is why cnc mounting plate work routinely shows up as the single most requested part type in our RFQ queue. This cnc equipment mounting plate is machined from **Aluminum 6061**, a versatile structural alloy chosen for its good strength-to-weight ratio, corrosion resistance and excellent machinability. The plate is a 5-axis milled part with multiple pocketed features, bolt-hole patterns, counterbores, locating-pin holes and machined reference surfaces. Critical dimensions, including hole true positions and the primary mounting face flatness, are held to **±0.005 mm**. For buyers sourcing an aluminum 6061 bracket plate for equipment installation, consistency across production batches matters as much as first-article accuracy — every plate must mount interchangeably without selective fitting at assembly.
**Part:** Mounting Plate
**Process:** 5-axis CNC milling
**Material:** Aluminum 6061
**Tolerance:** ±0.005 mm on critical dimensions
**Inspection:** 100% CMM verification, full report with shipment
Challenges of This Part & How We Machined It
Flatness across a large bolted surface
The most common failure mode on a mounting plate is not a single out-of-tolerance hole — it is a plate that leaves the shop flat and then warps after machining. Residual stress in the 6061 blank, combined with uneven stock removal from one side, pulls the part out of flat once it is released from the vise. A plate that reads perfect on the CMM when clamped in a fixture can easily shift by 0.03 mm after it sits free for a day. We address this by roughing both sides early, leaving symmetrical finishing stock, scheduling a stress-relief dwell between roughing and finishing, and then taking light skim passes on the final setup. The result is a plate that stays flat after assembly and over time, not just on the inspection table.
True-position accuracy across multi-hole patterns
A mounting plate typically has dozens of holes that must align with a mating component or frame. A hole that is off by 0.02 mm is enough to prevent a bolt from passing or to pre-load a bearing during install. The problem compounds when the pattern spans a large area: even small angular errors in the machine or fixture stack up across the plate length. We use the 5-axis machine to drill, bore and ream hole patterns in a single clamping whenever possible, eliminating stack-up from repeated setups. Threaded holes are tapped to consistent depth, and critical hole positions are verified against the GD&T callouts on the CMM rather than spot-checked with a pin gauge alone.
Edge integrity and cosmetic finish on visible hardware
Mounting plates are often the first part of a machine that a technician sees during installation. Chatter marks, exit burrs or uneven chamfers look unprofessional and can create safety hazards during handling — a sharp edge left on a plate that gets bolted into an assembly line is a cut waiting to happen. After machining we deburr every edge, break sharp corners consistently, and apply a uniform finish across exposed faces. Threaded holes are cleaned of chips, and the parts come out of the box ready to bolt on without handwork from the customer.
Machining Sequence
1. **CAM programming with simulation** — toolpaths and fixture strategy are verified digitally, including hole pattern drill cycles and pocket roughing, to avoid wasted setups on the machine.
2. **Rough milling of both faces** — bulk stock removal alternated between sides to balance stress relief, with uniform finish stock left on all critical surfaces.
3. **Stress-relief dwell** — parts are allowed to sit between roughing and finishing so that residual stress can redistribute before final passes.
4. **5-axis finish milling** — final passes on datums, pockets and chamfers, with hole patterns bored or reamed to size in the same setup.
5. **Deburring and edge finishing** — all holes and edges are deburred by hand under magnification, corners broken to drawing spec.
6. **CMM inspection** — flatness of the primary face, hole true positions, and critical feature dimensions are verified on the coordinate measuring machine; a full report ships with the order.
What You Get With Every Order
- **Free DFM review before quoting** — we flag manufacturability risk early, not after parts are made - **First Article Inspection report** with the first batch - **CMM dimensional report** on critical features - **Material certificates** for aerospace and medical grades - **Direct communication with the shop** — no trading company in between, we make the parts ourselves
Have a Drawing?
Send us your drawing or STEP file and we will come back with pricing within 48 hours. Prototype quantities and production runs both welcome — no minimum order quantity.
**TruPart Precision** trupartprecision.com | sales@trupartprecision.com WhatsApp: +86 137 1278 3205 No.114 Xinhua Road, Xinhe Dev Zone, Wanjiang, Dongguan, China