We machine one-piece aluminum frame arms, arm root fittings, folding joints and motor-end fittings for industrial multirotor frames, made to your drawing in 7075 or 6061 aluminum. Frame arms belong to our structural UAV components family.
Our customers are airframe engineers at UAV OEMs building inspection, mapping, delivery, agricultural and heavy-lift aircraft, who design their own frame. Arms work together with our drone center plates and drone landing gear mounts.
Pocketed 7075 or 6061 arms for quadcopter, hexacopter and octocopter frames, with the motor pad, cable channel and lightening pockets machined into one part. Integrating the motor pad removes a joint and keeps the motor axis tied to the arm’s datums.
Request a quoteThe arm-to-frame interface at the root, machined to your drawing. For airframes built on carbon tubes or plates with machined aluminum fittings, we machine the aluminum root fitting, with the tube OD set by your design.
Request a quoteThe fitting at the motor end of the arm, machined to your drawing in clamp or socket designs, with the tube OD set by your design on tube-built airframes. Our arm end connectors cover these clamp and socket designs in detail.
Arm end connectorsHinge blocks, locking pins and detents for frames that fold for transport. The joint must lock without play in flight and open without tools in the field.
Folding mechanisms
You specify the arm and we machine it to your drawing, from the first prototype arms to repeat production, from the same program and against the same datums.
An arm that deflects under thrust tilts the motor and feeds vibration into the frame and the payload. Section height, pocket layout and wall thickness are the levers; the arm’s natural frequency should sit away from motor and propeller frequencies.
The arm length follows propeller diameter and clearance between rotors; longer arms need more section to keep the same stiffness.
Deep pockets save weight but can distort the part as material is removed. Roughing, stress relief between operations and balanced clamping keep the arm straight.
On many industrial frames, arms are designed as the part that is replaced after a hard landing, with fittings that come off without disturbing the center plates.
The motor pad is machined to your motor’s pattern and thread; for separate mounts, see drone motor mounts. Motor and ESC cables run inside a channel or hollow section, with deburred exits.
On carbon tubes or plates with machined aluminum fittings, the joint between aluminum and carbon needs an insulating layer or sealant against galvanic corrosion.
| Parameter | Specification |
| Part types | One-piece aluminum arms, arm root fittings, folding joints, motor-end fittings |
| Frame types | Quadcopter, hexacopter and octocopter frames |
| Materials | 7075-T6 and 6061-T6 aluminum; Ti-6Al-4V (Grade 5) hinge parts; stainless steel pins |
| Finishes | Hard anodizing (MIL-A-8625 Type III), color-coded anodizing (Type II), laser marking |
| Tolerances | Per your drawing: ASME Y14.5 for flatness and hole position, ISO 2768 general |
| Critical features | Hinge bore and pin fits, motor pad flatness and angle, motor and root hole position |
| Inspection | CMM against the arm’s datums, same inspection plan for every batch |
| Quantities | Prototype arms to repeat production |
| Files accepted | CAD and drawing, formats to be confirmed |
Answers on aluminum alloys, folding joints, motor bolt patterns, finishes and order terms for UAV frame arms.
Upload your CAD and 2D drawing. An engineer reviews it before machining, we sign NDAs on request, and repeat batches are built to the same inspection plan.
Other UAV parts we machine to drawing.
We machine UAV gimbal housing parts to your drawing for industrial UAV and UAS programs: camera housings, yoke arms, motor housings and bearing seats of stabilized payloads. Each set is machined and inspected together.
We manufacture high-precision drone cable clamps with +/-0.005mm tolerances, engineered to eliminate wire chafing and signal interference in high-density UAV electronics.
AS9100 certified Bushings at ±0.005mm precision. Professional 4 to 7-day prototyping through mass production. Engineered for high-cycle drone reliability.
ISO9001 certified, we specialize in 4-7 day rapid prototyping of quick-release locks with latching mechanisms that combine effortless manual engagement with extreme vibration resistance.
Precision-engineered couplers (±0.005mm) for aerospace; ISO9001/AS9100 certified. Offering 4-7 day prototyping and scalable mass production with uncompromising mechanical integrity.
ISO9001/AS9100 certified, we manufacture high-stability drone screw-mount inserts with +/-0.005mm tolerances, engineered for high-vibration UAV environments.
English
French
German
Japanese
