I made a Steel ******* out of a leaf spring.The face is 2 1/2 wide and 4 inches long but flat.I want to put a radius on it but all I have is angle grinders ,air tools etc. Do I need a lathe?
A lot depends on the radius number. A 20" radius would require a bit different process than a 2" radius. Are you wanting the radius across the 2.5" face, the 4" face or both giving a concave or convex surface. Need specifics here.
Which shape?
https://images.search.yahoo.com/search/images;_ylt=AwrBT7yH08lYcpUAOwBXNyoA;_ylu=X3oDMTE0bDFmcjg3BGNvbG8DYmYxBHBvcwMxBHZ0aWQDQjM1MzZfMQRzZWMDcGl2cw--?p=metal+*******&fr2=piv-web&fr=mcafee
Use metal forming techniques and hammer it over a wooden mold? Shape over a shot bag? Etc.....