I am making a table lift, consisting of three pieces of wood/steel, first piece with bushing t in the middle of it, position toward one end of a long threaded rod. Second piece, with threaded nut wielded/epoxied, etc sits only 2" above third piece. Third piece has casters. Seond and third piece will stay in line using two rods vertically between the pieces. Three pieces extend across table width on the inside of the table. Point is no wheels seen, mobility when necessary, and no casters when doing actual work.
Goal is to turn threaded rod, which extends from above first piece, through second, and then simply sits in a bushing drilled in the third piece. Turning rod raises or lowers third cross piece, which has the casters, due to presence of nut on second piece.
Question is whether a hardwood, like OAK, would support the weight (500 lbs or so) or do I need to fashion a metal solution. There would be one of these 3-piece lifts at each end of the table, meaning each would need to support 240-300 lbs of weight.
Hope this is clear enough for an answer...thanks...