Welding cast iron can be extremely tricky because of air pockets in the casting. I would suggest to stick the head on another mill, and mill out pockets 1/4' deep, and wide enough so that you can bolt a piece of 1" CRS to either side an form the t-slot that way. Drill and tap for 1/4" countersunk screws. Then take and machine the slot opening to final size if necessary. 1/4" CRS should be plenty strong for the needed purpose, and it is accurate too. If you want it even more accurate, stick the CRS on the mill and face each side first. JB weld on the mating surface may be a nice overengineered what if safety precaution, as well as threadlocker on the bolts. Just a thought.
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Stop talking about it and do it already!!!!!
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
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