Abnormal loss of wire electrode of wire cutting machine and countermeasures

The "tool" of a wire cutting machine is a wire, the material is molybdenum, commonly known as molybdenum wire. The melting point of molybdenum is very high (2622 ° C), second only to tungsten (3410 ° C), but the elongation of molybdenum is 8 times that of tungsten. Therefore, molybdenum wire is one of the ideal electrode wires for wire cutting machine tools. Molybdenum is a colored rare metal, which is expensive, such as φO.14mm molybdenum wire, and the market price is 0.15 yuan/m. The use of molybdenum wire varies from person to person and its loss varies greatly. After cutting a section of several hundred thousand mm~2, the molybdenum wire is still safe. Some people also change the wire frequently in the cutting of several tens of mm~2 sections. I have explored effective ways to reduce the loss of molybdenum wire from many years of practice.

Centrifuge Tube Rack

At present, in the process of isolation and preparation of various stem cells from various tissue sources, Centrifuge Tubes with a volume of 15ml and 50ml are used.
It is one of the low-value consumables with high usage rate. It is generally installed on a dry foam rack with the package or in bulk. When used, it is taken out by the operator and placed on the plastic centrifuge tube rack in the ultra-clean workbench. The common centrifuge tube rack can only make the centrifuge tube stand upright. When transferring liquid or needing centrifugation, the operator should hold the centrifuge tube in the left and the night gun or aspirator in the right. If it is necessary to transfer a large amount of liquid reagents or perform gradient centrifugation operations, such as density gradient centrifugation to separate mononuclear cells, the operator needs to hold the centrifuge tube with the right hand for a long time and tilt the centrifuge tube, which often causes the operator's wrist joint pain. At the same time, it will also affect the liquid superposition effect, which will easily lead to the mixing of liquids of different densities, resulting in the failure of the experiment.

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