At my current employer we have about 400 people spread out between 4 different plants across different parts of the state,I handle hardware,software and user issues between all plants.
I spent 6 years on the shop floor,I have only been doing the IT thing for about a 2 years now.
People on the floor look at their work area as theirs,they DO NOT care who paid for it,during their shift it is their territory, and they feel like people should respect their territory just the same as if it were a private office.
It will help you immensely if you get a feel of how thing happen out there,and know when is or isn't a good time to be making changes, around here if I tried to make changes around the time of a shift change I am liable to get lynched,just ask around find out who is in charge in that area, inform them of your intentions and find out when it can be done with the least amount of disruption(usually while they are on lunch break).
When you walk out to the shop floor be prepared for salty language that is the way of that world, if you can't handle it you shouldn't work in a mfg. enviroment
You will have all kinds of remarks fired at you while you are doing something, all you need to do is fire something right back,but be prepared for several volleys though.This is kinda like joining a club with them, they are testing you to see if your are worthy of joining,bonding if you will.
Around here we tell guys,if we didn't liked ya we wouldn't fu*k with ya,that is how it works,it is all man to man my balls are bigger than your balls kind of stuff.
I personally have 2 personalities,my in the office professional personality, and my out on the floor, how the fu*k ya doin personality.That works out really well from my stand point.
Never ever act better than them,tell them you are just doing your job to enable them to do theirs, because in the big scheme of things you are someones flunky just like them.
The biggest piece of advice I can give you is to listen to them. The majority of people on the floor will resent any changes coming from the front office,they assume ALL changes that come down the pipe are made by people that have ABSOLUTELY NO idea of how things happen in the real world(sometimes it is true),they think it is going to make their job even harder than it already is.You don't have to agree with them just explain how the change will make it easier,
And above all be yourself, don't try to fake being friendly or lie to them,in the shop floor world a man is only as good as his word you lie to them and tou will regret ever being born,but if you are seen as one of them you will feel like part of a big foul mouthed family,I gaurantee it.
Sorry I'm so windy I'm talking about a topic I can relate too, hope this helps.
p.s. in the eyes of the people on the shop floor HR is about as low as you can get,they would have no problem telling all of HR to p!ss up a rope.