Not long ago, I wandered into Harbor Freight. (Hello, my name is Tom, and I’m a Harbor Freight-o-holic…group response, “Hi, Tom, tell the group your story…”
They had Cen-Tech combination squares with the center finder & adjustable angle thingie(not a technical term) on sale for about 6 bucks, so I bought one, even though I have 2 old Starrett combo squares in the shop. I think I was drawn in by that adjustable thing because my Starretts don’t have that. (Also, they were on sale & who can resist stuff on sale. It’s not a matter of need, I’ve got clothes I don’t wear that I bought on sale because they were really cheap), but, I digress….
The other day, I decided to check the square of the square, (does that take it to the 4th power???) I put it up to one of my Stanley tri (or it that “try”...do we have 3 uses here, or we just “try”ing to get things square? That has always bewildered me) square, and, lo & behold, it was off a little bit. I then put it up to one of my other Stanley tri (same bewilderment) squares. It was also off, but not the same amount. Then up to a Stanley all metal mini builders square, and my other Starrett combo, and everything seemed a tiny bit off from everything else.
So my question, and maybe this goes more to the philosophical rather than to the empirical, “Who do we believe?”
What’s my frame of reference? Does it really matter as long as my projects fit together?
If one square is off in one direction, and one is off in the other, should I use both of them alternatively to balance the project?
Should I arrange a trip to where they are made to compare my squares to the master square? Do these companies have a master, or do they have to go to the Bureau of weights, measures, and square things for their info? Are they kept in a square room?
Can someone please help me get to the square root of all this??? -SST
-- Accuracy is not in your power tool, it's in you