我厂生产中经常遇到大长度的检测工作。为了解决这种检测的需要,我厂检验科自力更生、土法上马,试制了500～1000毫米可调式大长度千分尺。(以下简称大长度千分尺)在此同时也试制了大长度千分尺必须具备的零位校正量棒。我科自制大长度千分尺所用的测微螺杆、固定套管、微分筒等均用0～25毫米外径千分尺上的零件,所以这种大长度千分尺每档量程范围是25毫米(国产大千分尺每把量程范围是100毫米)。这样要试制测量范围 I often encounter a large factory production testing. In order to solve the need of this test, I plant test self-reliance, soil unveiled, trial-made 500-1000 mm adjustable long-length micrometer. (Hereinafter referred to as the large-length micrometer) at the same time also made a large length micrometer must have zero correction bar. My department homemade micrometer long micrometer used in the micrometer screw, fixed casing, differential cylinder, etc. are 0 ~ 25 mm diameter micrometer on the parts, so this large length micrometer per range range is 25 mm (domestic large micrometer per The range is 100 mm). This trial to measure the range