Welding cart question...

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I am building a welding cart for a Lincoln Square Wave 175 TIG machine.  Lincoln lists the machine at 185lbs, but it feels a lot heavier.  I would guess that by the time you add leads, pedal, weight of the cart itself, and a large bottle of Argon, weight will be around 325-350lbs.  I've already welded up the base for the cart out of 2" box tubing, and I'm getting ready to mount the wheels.  I'm using 3" solid metal casters up front, and 8" solid rubber wheels in the rear (rated for 300lbs each).  The solid rubber wheels have a 5/8" center hub, so I will be using a piece of 5/8" rolled bar stock for the axle.  I'm welding the bar stock to a piece of 1'" angle for support, and will be welding it to the bottom of the frame of the cart (the piece of angle will be the width of the cart).  The cart is 14" wide, and the wheel hubs are 2" wide.  Overall length, by the time I add caps to keep the wheels in place, will be 15-15.5".  Here's the question I have.  Should I simply run one solid piece of bar stock for the axle, or can I get away with using stubs welded to the 1" angle?  If I can use stubs, what would the shortest length I can get away with and still adequately support the weight?  I know I have some 8" pieces of 5/8' bar stock, would they be long enough?  That would give me 2.5" out for the wheels, and 5.5" welded to the piece of angle.
Reply:You have the base together right?Can you post pictures of your base and what you are thinking of adding for the axle?Sounds like it will work for you though.
Reply:Here are a few pics, should give you a better idea of what I'm building.  This is the base of the frame.  I wanted the base of the welder to fit exactly with the frame, and gave it about 1/4" of clearance on the sides.  This gives me enough room to weld to the outside of the frame and not contact the actual machine itself.  I had to grind down a couple of the welds, as the bottom of the welder was not sitting flush.  Here's roughly where I want to mount the rear wheels.  Not sure if it really matters, but it should be directly below the bottom of the shield gas tank.  And that's pretty much where I am at this point.  I want to build a shelf above the machine, that way I can use it for storage space for cables, etc, or possibly even my Invertec V250-s.  I'm thinking of running a piece of box tubing straight up about 22", then build the shelf from there.  Shouldn't need to support more than 75lbs, but I need to figure out how to support it.  I can make some hooks on it to hang the cable, but I have to figure out which direction to head. I have to be very careful, as I still need to be able to get the machine in and out of the cart should the need arise.
Reply:Look at the welding cart thread - it will give you all kind of ideasThe main thing is not to panic or get excited Bobcat 250, X-Treme 12VS,  MM211Meltabo, Milwaukee,Porter Cable,Dewalt,MakitaVictor O/A, Ingersoll-RandEvolution Rage2, 40 amp PlasmaLincoln 225 AC/DC
Reply:The cart under my 175 just had stubs. In fact they were just bolts welded to the frame so the wheels could be stuck on the bolt and a locking nut spun on to hold the wheels on.12v battery, jumper cables, and a 6013.I only have a facebook page. https://www.facebook.com/pages/VPT/244788508917829
Reply:Those wheels will develop flat spots on them after awhile. Phenolic wheels are a good choice for heavier loads
Reply:eBay is the place to buy wheels. You'll save a boatload of money versus buying retail locally in most cases.
Reply:Well, realized I never updated this thread.  Took me a while to finish my cart, as other projects kept getting in the way.  Apparently, the only thing slower than TIG welding is actually building the TIG cart...Here it is with primer...Here it is reassembled, with the wheels in place.  I used 8" solid rubber wheels in the back, with solid steel casters up front:
Reply:...and, here it is with the Lincoln.  I used a piece of 7075 aluminum for the shelf and under the shield bottle.  Still haven't decided how I want to strap in the bottle of argon, have a web strap in place temporarily.  I really wanted a 230 cubic foot tank, which is how I set up the cart, but no luck so far.  Seems a 125ft tanks is the largest they give out on privately owned tanks, and I would have to lease one to get a 230ft (which I am simply not going to do).  I have two 125ft tanks, so I should be OK for a while.
Reply:I like it You may want to think about using a harder wheel on the back, those rubber ones tend to flatten after sitting with heavy loads on them after awhile. I personally like phenolic wheels, they can be had very reasonably on eBay if you shop around.I customized a set of ratchet straps to use on my carts for holding the bottles. I made U hooks out of flat strap and had them sewn into the straps by a tarp making place.pJust a thought. It's  looking good.Expert Garage Hack....https://www.facebook.com/steven.webber.948