Setup Hours Priced into a Small Batch Assembly Quote
Setup hours in small batch assembly represent fixed feeder loading, stencil alignment, and inspection programming costs that dominate unit landed pricing.
AOI Recipe Calibration
Threshold Adjustment
Optical inspection machines rely on a structured translation of digital images into binary pass or fail status through the application of a known golden reference. The aoi recipe calibration process aligns the gray scale intensity and spatial coordinates of a live board against this established master file. Discrepancies between the sensor feedback and the programmed expected values trigger specific alarm parameters.
These parameters govern the sensitivity levels that prevent false calls during production runs.
Optical Alignment
Machine vision platforms require periodic verification to ensure that light sources and sensor arrays detect features according to the original design specification. Technicians adjust the gain and exposure settings while a calibration target moves through the field of view. Constant monitoring of this hardware state allows the system to distinguish between actual solder bridging and noise artifacts.
Environmental factors such as ambient lighting or thermal expansion in the chassis necessitate frequent updates to these control values. Proper maintenance of the illumination profile prevents drift from skewing the comparison logic.
Coordinate Correction
Positional accuracy depends on the transformation matrix that maps pixel locations to physical locations on the substrate surface. Small shifts in conveyor alignment or board clamping force introduce errors that shift the inspection window away from the intended landing pads. The correction routine redefines the anchor points for every fiducial mark found on the panel.
Global offsets calculated during this stage apply to all subsequent components on the assembly. Accurate mapping of these physical boundaries remains the single factor that determines whether an automated system can consistently identify misaligned parts on a dense assembly.