Riddle me this

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OK, I'm putting this here because it has to do with a work in progress.  I'm building a cart for my new Lincoln MIG setup.  Right now my problem is that I don't currently have a bottle (welding with flux core).  In trying to leave a proper sized space in the back of the cart, I've realized I'm not sure how much space I should leave, lol.  I more than likely won't ever be dragging around a full size gas tank, but mainly the half sized ones (please excuse the newb description, I'm not sure what volumes they come in).  How much space should I leave in the back for a bottle?  What are the common diameters?TIA!Those that say "If it ain't broke, don't fix it" just don't understand!Fast-Cheap-Reliable:  Pick two.
Reply:Just build somthing in the 12 inch range with a decent floor..Remember to have a tank tie off chain up high on the tank somewhere..So the tank don't tip over.. ...zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:I think you need 9" Diameter for a 80 cubic foot tank or a 20 lb Co2.  And like Zap sez, chain it or make a gate so it can't fall over and go through a block wall.DavidReal world weldin.  When I grow up I want to be a tig weldor.
Reply:Have not forgotten about tank support, here is my rough design illustrated in paint  Support will be angle unless something with a wider angle is needed.  In that case I'll weld up my own support.  It will be plenty strong, I have a habit of overbuilding everything.Those that say "If it ain't broke, don't fix it" just don't understand!Fast-Cheap-Reliable:  Pick two.
Reply:I just finished a couple of carts for a pair of small Lincoln MIGs w/ 80cf tanks.The tanks I have (bought from I.O.C.) are 80cf and are 7" diameter.     Because I own the tanks and don't intend to exchange them, I designed the carts specifically for that size.     If you're going to be exchanging your tanks, I'd recommend building in a bit of extra clearance just in case. Attached ImagesThere are no small projects
Reply:I built an add-on to my stock Lincoln 175 MIG cart. Since I use a 20# C02 tank, I needed an 8" diameter area. I'll get out and take a picture ASAP. I think the other tanks may be 7".Miller Millermatic 252Miller Syncrowave 200Liincoln AC-DC 225Victor O-A Set
Reply:Maybe this will provide the answer:Tank Sizes