As I understand your question, the shop layout will be determined by flow. Flow of materials, processes, finished goods, rough stock, and executives. Put all the really crappy machines and cleaning equip in back so execs and customers only see your spotless gray coated, spit-shined shop floor with all it's red and yellow floor striping. Don't forget 2 little apprentices with dustpans and brooms that don't even let chips cool or fluids pool before nimbly sweeping them up....
...what's that? I'm rambling. Oh. So sorry.
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I never apologize. I'm sorry that's just the way I am.
However there is no any rigid rule for designing shop floor layout but there are many consideration like process flow,diff.process.One should design layout by considering minimum material movement ,following basic organic principles,studing space required for operator movement as well as material handling,foll.standard working height.
Work out your process flow, then the space constraints for both the machines and their operators. Arrange your machinery so that the output from one machine becomes the process input for the next; this will enable your plant to run smoothly with minimal interruptions due to material transfer. Finally, ensure that you have sufficient space around each machine for the maintenance crew to do maintain the machine and for housekeeping.
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If only you knew the power of the Dark Side of the Force