here's the Sheldon Brown DIY BB removal tool i think has been mentioned...
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Fixed-Cup Tools
Very elaborate, expensive, and special tools are sold to bicycle shops for fixed-cup removal and installation, but they are not really necessary. A few cheap home remedies can do the job quite well.
The first home remedy demands that you have a high-quality bench vise. Simply grab the fixed-cup wrench flats in the vise jaws, making sure that you have good contact with all of the wrench flats' meager width. Grasp the bike frame and unscrew it from the cup. This technique works quite well.
If you don't have a bench vise, or if the vise technique happens to not work well on your bike, you can make a universal fixed cup tool for less than a dollar (assuming you have access to a couple of large wrenches).
The tool is an imitation of a $40 shop tool that fits into the fixed cup as a crank spindle would, and pinches the cup. You apply unscrewing force to the tool, and it transfers this force to the cup with this tight friction fit.
The tool consists of a large bolt, a nut or two, and a few washers. The size of the bolt is not particularly critical, as long as the bolt is strong enough not to break, but small enough to fit through the hole in the cup. I used to use an ordinary 1/2-inch, 13 TPI hex bolt (also called a "cap screw"), which served me well for quite a while. It finally met its match on friend's Schwinn that had an unusually tight fixed cup; the bolt snapped in two before I could remove the cup.
Now I use a 5/8-inch 18 TPI hex bolt 1 1/2inches long, with a nut, a flat washer, and four lockwashers. The 5/8-inch size is the largest standard size that will fit through the hole in the cup. This bolt and nut both take a 15/16-inch wrench. With my 1/2 inch drive Craftsman six-point socket set, the 15/16-inch socket is also the largest size that will fit into a normal bottom bracket shell.
If you have some other brand of socket, check the fit before you buy the bolt and nut-you might need the next size down (9/16-inch).
Home-made tool shown in cutaway bottom bracket cup.
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i put one together from items bought at the local Ace Hardware store. it works. no question.