Abstract: A worktable clamp structure includes a clamp unit, a bushing unit, and a worktable. The worktable includes a tabletop and a frame. Each side edge of the frame has a plurality of pairs of side perforations, and a central perforation is provided between each pair of the side perforations. The bushing unit is inserted and fixed to and the side perforations and the central perforation of the frame of the worktable. The clamp unit is movably mounted to the bushing unit. The clamp unit and the bushing unit can be mounted to the side perforations and the central perforation at either side edge of the frame of the worktable according to the demand, without the need to fix the clamp unit to the tabletop of the worktable in a destructive manner. This can prevent deformation of a clamping seat due to the force applied thereto to achieve structural stability and ease of use.

Abstract: A display structure of a drilling machine includes a digital display control assembly which includes a liquid crystal control panel, a control circuit board, a displacement induction controller and a battery seat. The liquid crystal control panel is electrically connected with the control circuit board. The control circuit board is electrically connected with the displacement induction controller. The control circuit board is further electrically connected with the battery seat. The displacement induction controller includes an engaging protrusion to engage with a displacement control linking seat of a feed guide body. The liquid crystal control panel of the digital display control assembly is adapted to input control signals, such as an initial point, a terminal point and a feed unit, and the control signals are sent to the displacement induction controller via the control circuit board.

Abstract: A drilling machine includes a stand unit, a drilling spindle unit, and a drive motor unit. A power control member controls a drive motor of the drive motor unit so as to control the rotational speed of the drive motor. A driving shaft of the drive motor drives a driving shaft sleeve of the drilling spindle unit to bring a working spindle in the driving shaft sleeve. The rotational speed of the drive motor is controlled by the power control member only. The present invention has a simple and endurable configuration, and is convenient for use and has stable configuration.