Hi NC Cams - I like the idea of thermal fit in theory. In the case of the Tormach Spindle I assume assembly would be something like - (correct me if wrong.

Heat the housing/chill the bearings, and drop them in opposite ends, so hold them in place until the bearing heats up.

Heat up the housing and bearing assembly alittle more, chill the spindle, and slip it in.

Now that is the part that would worry me as the bores are quite small, the shaft may have quite a interference fit - and the coefficient of linear expansion/contraction to allow assemble the whole way in - IE not warming the spindle and causing partial assembly 'lock up', or melting out the grease etc if more heat was needed - or do you reccomend applying the grease after assembly?.

Or is there a better procedure?