Geometric description: The model is a high-precision mechanical slide base, with an overall rectangular block shape and made of cast iron. The base dimensions are 150 mm in length, 100 mm in width, and 30 mm in height. On the upper surface of the base, along the length (150 mm direction), there is a dovetail guide rail that protrudes. The bottom width of the guide rail is 60 mm, the height is 15 mm, and the side angles are 60 degrees, forming a trapezoidal protrusion for guidance. On both sides of the base (150x30 surfaces), there is a T-slot running the entire length. The T-slot has a mouth width of 10 mm and an internal width of 16 mm, used for installing limit blocks. At the center of the top surface of the dovetail guide rail, there is a countersunk hole with a diameter of 30 mm (the larger hole has a diameter of 40 mm and a depth of 5 mm). Additionally, at each of the four corners of the base, there are countersunk mounting holes with a diameter of 8 mm. At the root of both sides of the dovetail guide rail, there are 2 mm wide and 1 mm deep tool relief grooves (oil grooves). The overall structure consists of the base, dovetail protrusion, side T-slots, central countersunk hole, four corner mounting holes, and oil groove details.

Modeling procedure: Datum and Base: The XY plane is used as the datum, with the origin (0, 0, 0) of the absolute coordinate system located at the center of the base bottom. Construct a rectangular base that is 150 mm long (along the X-axis), 100 mm wide (along the Y-axis), and 30 mm high (along the Z-axis), with its top surface at Z = 30 mm.

Dovetail Guide: Center the dovetail table on the top surface of the base (Z = 30 mm) and extend it along the entire X direction (full length of 150 mm). The dovetail cross-section is an isosceles trapezoid in the YZ plane, with a base width (lower base) of 60 mm, a height of 15 mm, and the sides inclined at 60�� to the horizontal plane. Therefore, the upper base width is 60 mm - 2 �� (15 mm �� tan 30��) �� 60 mm - 2 �� 8.66 mm �� 42.68 mm. The top surface of the dovetail guide is at Z = 45 mm.

Oil Grooves: Cut two rectangular grooves along the X-axis at the junction of the dovetail inclined surfaces and the top surface of the base (Z = 30 mm) on both sides of the dovetail guide. Each groove is 2 mm wide (along the Y-axis) and 1 mm deep (along the Z-axis), with the bottom of the groove at Z = 29 mm, and the length extends the full length of the dovetail guide (150 mm).

Side T-Slots: On the two Y-direction side surfaces of the base (Y = +50 mm and Y = -50 mm), cut through T-slots along the X-axis. The centerline of the T-slot is at a height of Z = 15 mm. The opening part of the slot is 10 mm wide and 6 mm deep (from the surface to the neck); the widened part below is 16 mm wide and 6 mm deep, with a total cutting depth of 12 mm. The T-slot is 150 mm long and runs through both ends of the base.

Central Hole: At the center of the top surface of the dovetail guide (X = 0, Y = 0, Z = 45 mm), cut a through-hole with a diameter of 30 mm, extending vertically downward (in the negative Z-axis direction) through the entire base (from Z = 45 mm to Z = 0). Additionally, around this through-hole on the top surface (Z = 45 mm), cut a counterbore with a diameter of 40 mm and a depth of 5 mm (the bottom of the counterbore is at Z = 40 mm).