SMT pick-and-place machines are the core equipment in SMT production and are generally divided into two main categories: turret type and gantry type. Each type has distinct structural characteristics, performance strengths, and limitations.
1. Turret Type SMT Pick-and-Place Machine
Working principle: Component feeders are mounted on a single-axis moving feeder carriage, while the PCB is fixed on an X/Y worktable. Multiple placement heads are installed on a rotating turret. During operation, the feeder carriage moves components to the pickup position, vacuum nozzles on the heads pick up the components, and the turret rotates to the placement position. Component position and angle corrections are completed during rotation before final placement onto the board.
Advantages:
High-speed placement: A turret typically carries 10–20 placement heads, each equipped with 2–6 vacuum nozzles. By subdividing actions such as nozzle selection, feeder movement, pickup, recognition, adjustment, and placement, different steps can be executed in parallel within the same cycle, achieving genuinely high throughput.
Efficient coordination: The multi-head design enables more placements per unit time, making it suitable for high-volume production.
Disadvantages:
Limited component range: Strict requirements for component size, shape, and weight make it difficult to handle irregular or ultra-small components.
High cost: The complex mechanical structure results in a significantly higher machine price compared with other types.
2. Gantry Type SMT Pick-and-Place Machine
Working principle: Component feeders and the PCB remain stationary, while the placement head is mounted on a gantry-style X/Y beam. The head moves back and forth between feeders and the board to pick up components, correct position and angle, and complete placement.
Advantages:
High accuracy and flexibility: The simpler system structure allows precise placement and adapts to components of various sizes and shapes, including odd-form parts.
Strong compatibility: Supports tape, tube, tray, and other feeder formats, meeting small- and medium-batch production needs. Multiple machines can be combined for larger volumes.
Mature technology: Many domestic manufacturers focus on gantry-type machines, with deep technical accumulation. Some high-speed models have approached the speed of turret machines.
For applications involving special-shaped components or small-batch production, dedicated nozzles, positioning fixtures, or guide rails may be required. Hansheng Automation can machine these non-standard parts according to customer drawings, supporting the inherent flexibility of gantry-type equipment.
Disadvantages:
Limited speed: The placement head must travel long distances along the X and Y axes, increasing per-placement cycle time and reducing overall efficiency compared with turret machines.
Batch production bottleneck: Although multiple machines can be combined to increase capacity, the single-machine speed is still constrained by physical movement limits.
3. Application Comparison
Turret-type machines are suited to high-speed, standardized, high-volume production with a relatively uniform component mix, such as consumer electronics mainboards. Gantry-type machines are more flexible, covering small- and medium-batch diversified production, such as industrial control boards and automotive electronics, while continuing to penetrate higher-speed applications through technical upgrades.
The two types complement each other in speed, accuracy, cost, and suitable application scenarios. Manufacturers need to select equipment based on production scale, component variety, and budget.
