GB/T 907-82 Cold-pulled Liu Corner Rule Size, Shapes, Weight and Permitted Tolerance
Liu Corner Rule, also known as Cold-Pulled Liu Corner Rule, is a kind of measuring tool mainly with scale and square blocks. It is mainly used for measuring and marking right angle. Hence, Liu Corner Rule is usually used in machining, tools, carpentry and so on. This article is to discuss the size, shapes, weight and permitted tolerance of GB/T 907-82 Cold-Pulled Liu Corner Rule.
Size
According to GB/T 907-82, the standard size of Cold-Pulled Liu Corner Rule is 250 mm. The tolerance of its length should not exceeding ±0.1 mm. As for the scale width on the upper surface, the usual size is 2.5 mm. Tolerance for it should not exceed ±0.025 mm. As for the square blocks, the thickness should not greater than 0.9 mm, with a tolerance of ±0.1 mm.
Shape
The Cold-Pulled Liu Corner Rule should have a shape of 90°angle between its upper surface, main surface and its bottom surface. The main surface and upper surface should be in a form of straight line. The square blocks should have a 45°angle between its faces. The outside angles should be greater or equal to 90°whereas the inside angles should be less or equal to 90°.
Weight
The permitted weight of the Cold-Pulled Liu Corner Rule should not surpass 43g.
Permitted Tolerance
The size and shape of Cold-Pulled Liu Corner Rule should meet the requirement of GB/T 907-82. The square blocks should evenly distributed with the upper and main surface. The distance between their square should meets the requirement of tolerance±0.2 mm. The inside and outside angels of the square block should be 90°±1′. Giya tolerance should be 0.005 mm/m.
Conclusion
In conclusion, GB/T 907-82 Cold-Pulled Liu Corner Rule is a kind of measuring tool mainly used for measuring and marking right angle. The size, shape, weight and permitted tolerance are discussed in the article according to GB/T 907-82. For the size, the standard length should be 250 mm, with a tolerance of ±0.1 mm. As for the shape, the 90°angle should present between its upper surface, main surface and its bottom surface. The square blocks should have a shape of 45°angle between its faces and giya tolerance should be 0.005 mm/m. As for the weight, it should not passes 43g.
