This number is going to vary hugely depending on the machine, how you operate and how many feeders you have. Smaller outfits might have a single operative whose job it is to setup, load, run & program the line. Regardless of how changeover focused the machine your machine is, in this scenario you will 'waste' far more time than a larger outfit that has a dedicated pick team loading parts onto feeders/racks/trolleys. As one of those smaller outfits I know I can load a lane in under 60 seconds but I would allow for 3 minutes to include checks, splicing, unloading a previously loaded part and other unplanned issues. It is also possible to prep the next job while the current one is running but that depends on how many 'spare' feeders are available, how much attention the current job requires and how large the current job is. Downtime becomes very significant with multiple complex PCB's in small numbers. Our Essemtec machine is standalone and uses CLM feeders in banks of 10 lanes. An inline machine would free up more time for the operator to prep the next job. Single lane feeders make it easier to optimize the lane locations for each job. Dumb feeders with high changeover make it far more likely/easy to load a feeder in the wrong slot if you are optimizing every job.
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