Feet sine: also known as the sine 
 The sine-foot indirect measuring method precision measurement model point of view, with the use of special measuring tools of the cone, as well as other similar tools and the workpiece, the need and the amount of the block, the instruction sheet and so on. The distance L between the sine-foot cylindrical main body and two components, both ends of the cylinder centerline, 100 and 200 mm two specifications. Width B of the work surface, the sine-foot wide face type with a narrow face. A series of threaded holes in the wide surface of the sine-foot table, used to clamp the workpieces of various shapes. 
 Sine scale measuring principle: the sine-foot angle-measuring principle is based on the use of a right triangle sine function basis. Measurement, according to the label of cone gauge can be detected from the manual, the corresponding taper K = 2tgα and then sinα can be obtained. Selected based on the measured cone plug gauge the public that the cone angle (2α), according to the following formula to calculate the height h of the amount of block group; h = L the * sin2α type L-sine-foot center distance between the two cylindrical axis line (100 or 200mm). 
 Sine-foot http://www.bthxzw.com/zhengxianchi.html 
 According to the calculation of the value of h, the combination of the amount of block below the mat in the foot of the sine sine-foot face and flat angle of 2α. Then, the tapered plug gage on the sine-foot work surface, if the measured cone angle is just equal to the nominal cone angle indicator a, b two points to the value of the same, namely, the prime line of the tapered plug gauge and flat parallel . On the contrary, show the value of a, b, two points there must be a difference between n, suggesting the existence of a cone angle of deviation. 
 The fact workpiece taper K can be identified through look-up table, derived from the K = 2tgα sin2α = 4K / (4 + K * K), block group is the amount of height h following formula calculated directly. h = 4LK / (4 + K * K) 
 Measurements in the cone generatrix select a, b, two, and measured a, b two points with the base surface distance difference △ H, taper error △ (2α) = △ H / l. Where l is a, b between two points, the distance measurement method for the indirect measurement method. If the experiment is the measured cone angle 2a> 2a, the a-b = + n; if 2a <2a, then a-b =-n. Shows that the cone angle of deviation is calculated as follows: △ (2α) = tg [△ (2α)] = n / l type - a, b. Two points the distance between the N - indicates the table in a, b two The difference in readings between. △ (2α) in units of radians (1 radian = 2 × 10 seconds) 
 Sine-foot http://www.bthxzw.com/zhengxianchi.html 
 The Botou Navistar cast material measuring 
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 Contact: Xin Yue