I have an old surface plate made by Jones Bros., patent # 2,410,877 (8/27/1943), and am looking for a new stand. The plate has a ledge and measures 30" x 20-3/4" at the base, 30" x 24" at the top, 6" thick. The manufacturer is long since out of business. We lifted the plate today and it weighs ~370 lbs. I did not see any contact points or marks on the bottom.
I know that new plates are made to spec GGG-P-463C, for three points of contact. I believe this plate was made before that spec was published. Do I need a stand that has three points or would I be better off with one that does not have points? Also, I was told I could use a stand made for a 24" x 36" plate...is that right? I did see Mitutoyo has a 24" x 30" stand, but it is out of our price range.
I know that new plates are made to spec GGG-P-463C, for three points of contact. I believe this plate was made before that spec was published. Do I need a stand that has three points or would I be better off with one that does not have points? Also, I was told I could use a stand made for a 24" x 36" plate...is that right? I did see Mitutoyo has a 24" x 30" stand, but it is out of our price range.