Measurement of the depth of the screw countersunk head on the thin plate

There is a product in our factory that needs to drill a screw countersunk hole in the thin plate. In the past, it was difficult to directly measure the depth of the countersunk hole. Therefore, the screw head was too deep in the assembly, and there was a gap between the fasteners, which could not be fastened (Fig. 1). For this reason, we came up with the indirect Method of measurement (Figure 2). Put a steel ball of suitable diameter into the counterbore hole. When the thickness δ of the thin plate, the diameter D of the steel ball, the taper angle α and the diameter d of the bottom hole are known, the distance H from the top of the ball to the bottom of the plate can be measured. The following formula is used to find the depth of the countersunk hole h (the formula is deduced slightly):

Pipette Rack

When there is liquid in the Pipette tip, do not place the pipette horizontally or upside down, so as to prevent the liquid from flowing back and corroding the piston spring.In the process of biological experiments, especially in the field of Cell Culture, the pipette is an indispensable laboratory instrument, and the pipette holder is also used very frequently on the laboratory ultra-clean bench or in the biological safety cabinet. The ease of use of the pipette and the pipette holder also affects the ease of experimental operation.

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