|Review by jond||posted 06-07-2009 03:38 AM||8386 views||0 times favorited||11 comments|
When I was searching for an inexpensive combination square, I was unimpressed by the standard BORG-type plastic squares and was unable to justify quite a bit more for the Starrett model. I was intrigued by the discussion on here about the Empire squares in one review and decided to buy one. I bought the 16” version from Sears ($16 currently). I found it to be straight and square according to the “flip it and try to match your line” test, at least down to the width of my 0.7 mm mechanical pencil. What I did not know, however, was how straight the blade of the square was. It was guaranteed down to 0.001 per inch, or a maximum of 0.16 for my unit, which seemed like quite a bit of possible deviation.
For my sharpening station I recently bought a granite surface plate (Grade A – 2.4 micron deviation over the surface of the plate per the included calibration certificate) from Woodcraft, and I decided to buy a set of feeler gauges to complement the plate and examine some of my tools. I put the square on the plate and tried to put my 0.0015” leaf under the edge of the blade, and I couldn’t.
Thus, while the guaranteed deviation from straight on these units could be rather high, my tests indicate that my particular square is quite straight. The square seems to be a great value buy for those of us whose every dollar spent on tool A means a dollar less on tool B.