1. Survey <br> <br> stainless steel chainring shot study, a longer period of time (2-3 months), the quality can not be guaranteed, with a pass rate of only about 50% of time will be wasted and can not guarantee the quality of products It has become a "bottleneck" in the production of such turntables, which has seriously affected the contract performance and is not suitable for the research and production needs of our institute.

2. Test analysis and application of measures taken <br> <br> precision end toothed disc on the turntable precision shafting, we work according to the principle of chainrings, structural features, done a lot of testing, and to take on this basis The following measures:

(1) When assembling, select a set of springs, that is, first measure the natural length of the spring, and require the length difference to be within 0.05mm, then use the weight to detect the spring deformation, and select the spring with uniform tension (elastic force) for matching use. Table 1 is a spring test analysis comparison table.

(2) For the problem that the gap between the electromagnet and the armature is uneven and the spacing is too small, the armature of the toothed disc is detected by the lever dial gauge, and the feel of the armature surface mounted on the toothed disc is detected. The distance between the electromagnet and the armature is adjusted so that the electromagnet and the armature are (0.15±0.05) mm after the toothed disc is sucked, and the parallelism of the suction surface between the electromagnet and the armature is controlled. At 0.02mm. Table 2 and Table 3 are the test analysis of the unevenness of the gap between the electromagnet and the armature, and the comparison and analysis of the test between the fixed toothed disc and the movable toothed disc.

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Serological Pipette

Disposable serological pipettes with polyester fiber plugs are ideal for tissue culture applications. Crisp, black, highly legible permanent graduations prevent ambiguity and guarantee precise reading and accurate dispensing within ± 2%. Reverse graduations show volume removed or remaining on all pipettes larger than 1mL. Generous negative graduations provide additional pipetting volume. Yongyue's serological pipettes are made from transparent USP Class VI polystyrene sterilized by gamma irradiation. Each lot is free from pyrogens, DNases, and RNases.Yongyue's plastic serological pipettes are produced under the strictest protocols and offer the highest degree of accuracy.
The pipettes are supplied with an aerosol barrier plug that prevents both liquid and aerosols from contaminating the pipettors.
The serological pipettes are produced from crystal clear polystyrene (PS) and are color coded for easy volume identification. Available in 1mL, 2mL, 5mL, 10mL, 25mL and 50mL sizes.
In addition each Pipette now features:
Crisp and bold easy-to-read graduation marks
Reverse graduations on all volumes
Negative graduations on all volumes
1, 2 and 5mL pipettes feature one-piece construction

10, 25 and 50mL pipettes feature three-piece construction