Screw micrometer, also known as micrometer, screw micrometer and micrometer clamp, is a tool for measuring length more accurately than vernier caliper. It can accurately measure the length to 0.0 1 mm, and the measuring range is several centimeters. Part of it is processed into a thread with a pitch of 0.5 mm. When it rotates in the screw sleeve of the fixed sleeve B, it will move forward or backward. The movable sleeve C is connected with the screw as a whole, and its periphery is divided into 50 squares. The complete number of turns of the screw is measured by the scribed lines on the fixed sleeve with an interval of 0.5 mm, and the part less than one turn is measured by the scribed lines around the movable sleeve, and the final measurement result is estimated to one decimal point.
Screw micrometer, also called micrometer, is a precision measuring tool. Micrometer is also called screw micrometer. The first such measuring tool was made by Jean, a French inventor.
Laurent Palmer, telephone 1848
In 2008, it was patented as "Thread Caliper with Circular Cursor Frame". Today, we still use this typical feature to manufacture outside micrometer. The introduction of micrometer into the mechanical world began with two American engineers Joseph.
Brown and Lucian Sharp visited the Paris Exhibition 1867. Their attention was attracted by Palmer's invention and they were very interested. Yes, Palmer.
After the design was improved, the products were manufactured in large quantities and successfully promoted by two partners in the market. When TESA Company of Switzerland decided to manufacture the outside micrometer, they repeated the story that happened in the past, making it the first product of the company. Except for a few cases (such as micrometer for measuring gears), the micrometer we use follows Abbe number.
Principle (Abbe principle), just like a comparator. Micrometer spindle is machined by modern grinder, with high thread profile accuracy and negligible pitch deviation. The processing conditions ensure that the micrometer has extremely low measurement uncertainty.
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