A 1-2-3 block is a reference and pedagogical device for innumerate metalworkers.
Ned Simmons
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18 years ago
What is it? LXXI
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18 years ago
It's a packing block, with a convenient range of adjustable heights, It's also full of holes, so you can stick bolts through it.
Imagine you're trying to clamp a T-shape to the table of a milling machine and only the central leg of the T is machined flat and clampable. Hang it over the top of a 1-2-3 block and you can hold it down, without resting on the as-yet unmachined bosses of the T's crossbar.