Abstract: A grinding and polishing device includes a main body, a grinding disk, a sample disk, a first console, and a second console. The main body includes a support table and a support column. The support table is coupled to the support column. The grinding disk is fixed on the support table and includes a polishing surface. The sample disk is fixed on the support column and configured to hold a preform. The first console is electrically coupled to the sample disk and used for controlling a distance between the preform held by the sample disk and the grinding disk. The second console is electrically coupled to the grinding disk and used for controlling a working state of the grinding disk for grinding and polishing the preform.

Abstract: A grinding and polishing device includes a main body, a grinding disk, a sample disk, a first console, and a second console. The main body includes a support table and a support column. The support table is coupled to the support column. The grinding disk is fixed on the support table and includes a polishing surface. The sample disk is fixed on the support column and configured to hold a preform. The first console is electrically coupled to the sample disk and used for controlling a distance between the preform held by the sample disk and the grinding disk. The second console is electrically coupled to the grinding disk and used for controlling a working state of the grinding disk for grinding and polishing the preform.

Abstract: A vacuum suction pen which can always be held squarely above a work being done notwithstanding the orientation of a component to be fitted to the work includes a penholder, a pen head, a connecting mechanism, and a suction cup. The suction cup is at an end of the pen head away from the penholder and made of rubber for soft handling. The connecting mechanism is coupled to the penholder and the pen head, and comprises a connecting member, the connecting member comprises a first connecting portion and a second connecting portion, the first connecting portion is disposed in the penholder, the second connecting portion is coupled to the pen head, and the pen head can be rotationally disposed on the penholder. A method for using the vacuum suction pen is also provided.