摘要:
A method for verifying scan precision of a laser measurement machine includes the steps of: preparing a standardized BGA model; measuring Z coordinates values of each solder ball peak of the BGA model for certain times; determining a Z coordinates conventional true value of each solder ball peak; measuring X, Y coordinates values of each solder ball centre of the BGA model; determining a coplanarity conventional true value of a seating-plane; determining an optimum scanning mode; determining optimum scanning parameters under the optimum scanning mode; scanning the BGA model under the optimum scanning parameters and the optimum scanning mode; obtaining X, Y, Z coordinates values of each solder ball peak; evaluating the veracity of Z coordinates of each solder ball peak; evaluating the veracity and repetitiveness of coplanarity; and evaluating scan precision of the laser measurement machine.
摘要:
An improved wire connecting terminal structure extensively used in different electric appliances and equipments includes a wire connecting terminal in an input/output interface of the structure. The wire connecting terminal includes a plurality of metal contact brackets coupled with a plastic body by a plastic injection molding. The plastic body includes a two-sectional latch groove disposed on both left and right sides of the plastic body, so that a latch hook disposed on both left and right sides of the latching member is latched into an upper groove of the two-sectional latch groove, and a flexible multi-core cable is passed onto a metal contact bracket, and then the latching member is pressed and latched downward to latch the latch hook into a lower groove of the two-sectional latch groove, so as to closely contact the connecting wire with the metal contact bracket and constitute an overall wire connecting terminal.
摘要:
A rotating plug connected to a power supply of an electric appliance and having a conductive terminal with bending and rotating functions includes an inner frame, two conductive terminals, two inner frame brackets, two connecting plates, two inner frame casings, a power cable and a plug body. A connecting end at the rear of each of the two conductive terminals of the rotating plug is installed and hidden in the inner frame, and the connecting plate is accommodated and fixed inside the inner frame casing. When use, the plug is bent and rotated upwardly or downwardly by an angle, while the conductive terminal and the connecting plate are being covered without being exposed, so as to improve the safety of the rotating plug.
摘要:
A rotating plug connected to a power supply of an electric appliance and having a conductive terminal with bending and rotating functions includes an inner frame, two conductive terminals, two inner frame brackets, two connecting plates, two inner frame casings, a power cable and a plug body. A connecting end at the rear of each of the two conductive terminals of the rotating plug is installed and hidden in the inner frame, and the connecting plate is accommodated and fixed inside the inner frame casing. When use, the plug is bent and rotated upwardly or downwardly by an angle, while the conductive terminal and the connecting plate are being covered without being exposed, so as to improve the safety of the rotating plug.
摘要:
In a dial indicator correcting method, a first command is sent to a single drive shaft for controlling a push rod to move toward dial indicators. The method records a first indicated value of each dial indicator when the push rod contacts with one of the dial indicators, and records a second indicated value of each dial indicator when the push rod has contacted all the dial indicators. The method further sends a second command to the single drive shaft for controlling the push rod to move when a distance of the push rod equals a measuring range, and records a third indicated value of each dial indicator when the push rod moves with each moving step. By subtracting the third indicated value from the second indicated value, a forth indicated value of each dial indicator is obtained and is corrected by a running deviation of the single drive shaft.
摘要:
A method for verifying scan precision of a laser measurement machine includes the steps of: preparing a standardized 3D profile model; determining an ideal curved surface as a conventional true value of the standardized 3D profile model; scanning the standardized 3D profile model by the laser measurement machine and obtaining point cloud data; calculating a bias between each point in the point cloud and the ideal curved surface; evaluating the veracity of the laser measurement machine by using the largest bias; and evaluating the receptiveness of the laser measurement machine.
摘要:
A method for verifying scan precision of a laser measurement machine includes the steps of: preparing a standardized BGA model; measuring Z coordinates values of each solder ball peak of the BGA model for certain times; determining a Z coordinates conventional true value of each solder ball peak; measuring X, Y coordinates values of each solder ball centre of the BGA model; determining a coplanarity conventional true value of a seating-plane; determining an optimum scanning mode; determining optimum scanning parameters under the optimum scanning mode; scanning the BGA model under the optimum scanning parameters and the optimum scanning mode; obtaining X, Y, Z coordinates values of each solder ball peak; evaluating the veracity of Z coordinates of each solder ball peak; evaluating the veracity and repetitiveness of coplanarity; and evaluating scan precision of the laser measurement machine.
摘要:
A method for verifying scan precision of a laser measurement machine includes the steps of: preparing a transparent flat, of which the flatness of each plane is regarded as a flatness conventional true value; determining an optimum scanning mode; determining optimum scanning parameters under the optimum scanning mode; scanning the transparent flat under the optimum scanning mode and the optimum scanning parameters for certain times, and obtaining measuring data; calculating a plurality of flatness values using the measuring data; calculating an average value and a standard deviation of the flatness values, and a bias between the average value and the flatness conventional true value; evaluating the repetitiveness of the laser measurement machine according to the standard deviation; and evaluating the veracity of the laser measurement machine according to the bias.
摘要:
A method for verifying scan precision of a laser measurement machine includes the steps of: preparing a standardized 3D profile model; determining an ideal curved surface as a conventional true value of the standardized 3D profile model; scanning the standardized 3D profile model by the laser measurement machine and obtaining point cloud data; calculating a bias between each point in the point cloud and the ideal curved surface; evaluating the veracity of the laser measurement machine by using the largest bias; and evaluating the receptiveness of the laser measurement machine.
摘要:
A method for verifying scan precision of a laser measurement machine includes the steps of: preparing a transparent flat, of which the flatness of each plane is regarded as a flatness conventional true value; determining an optimum scanning mode; determining optimum scanning parameters under the optimum scanning mode; scanning the transparent flat under the optimum scanning mode and the optimum scanning parameters for certain times, and obtaining measuring data; calculating a plurality of flatness values using the measuring data; calculating an average value and a standard deviation of the flatness values, and a bias between the average value and the flatness conventional true value; evaluating the repetitiveness of the laser measurement machine according to the standard deviation; and evaluating the veracity of the laser measurement machine according to the bias.