Motion Profile
Robotic gantry systems in surface mount technology placement utilize smooth acceleration profiles to minimize mechanical vibration during high-speed movements. The s-curve trajectory provides a multi-segmented motion path where acceleration increases and decreases gradually, avoiding the sharp changes in forces that characterize linear profiles. It protects delicate electronic components from shifting on the nozzle during transit.
Mechanical Stability
High-speed pick-and-place machines encounter severe mechanical stress when translating components from feeders to the printed circuit board. Utilizing an s-curve trajectory limits the rate of change of acceleration, known as jerk, which keeps the machine frame from vibrating. This reduction in vibration allows the nozzle to settle immediately upon reaching the target coordinate, enhancing throughput without sacrificing accuracy.
Optimization Setting
Engineers configure the specific segments of the motion controller’s firmware to tune the transition times between the acceleration and deceleration phases. Optimizing these parameters involves a trade-off between the cycle time of the placement head and the maximum permissible vibration amplitude. A shorter transition period speeds up the cycle but increases the residual vibration, whereas a longer transition period ensures smoother travel at the cost of total boards produced per hour.
High-volume manufacturers run test plates to find the ideal settings that maximize output while maintaining defect-free alignment on fine-pitch devices.
