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| Adam |  TolerancesDecember 14th, 2005 04:14 AM December 14, 2005 Tolerances Different types of woodworking and trades tend to have different measurement tolerances they can routinely use. As posted earlier, the new LASER stuff is well within a Carpenter's likely tolerance range. You know that rectangular "Carpenters' Pencil" commonly sold in lumberyards and Sears? It has a big 'ol wide and thick piece of pencil lead. And, that kind of wide, variable width when drawn line is fine for Carpentry work. A thin pencil line can be used to advantage by Cabinet makers and Finish Carpenters doing trim work. Furniture makers, doing highly precision work such as hand-cut dovetails, don't use a pencil. They use either a scribe or "striking knife" that leaves a faint mark that is just a few thousandth's of an inch wide. As a machinist, I had a scribe that I kept sharp using a honing stone, with a line drawn on a dried coating of marking material, called DIKE'M BLUE (big time spelling). I often used a measuring tool called a Micrometer to measure items within one-thousandth (0.001) of an inch. An average human hair is approximately THREE thousandth's (0.003) of an inch thick. My micrometer was equipped with a vernier feature that could get my measuring accuracy down to a resolution of a ten-thousandth (0.0001) of an inch. So, what tool you use, with what measuring and marking tolerances varies widely with WHAT work you are doing. You only need the accuracy and repeatability the job requires. |
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