Fastening of the nipple position
Fastening of the nipple position: the best is A/2(or L/2) -0.1mm, the tolerance is ±0.1mm. drill by using the template at the angle of 9°27′44″and imbed the φ8mm locating pin.
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The fixed pin must be a special one made with the plastic expansion bolt or with graphite and coke, the composition of which includes 80% coal, 10% paraffin wax, 10% phosphate mixture, and the chemical equation is C+CnH2n+2+xM2OySiO2.