Motorcycle Engine Cylinder Block

Execute a precise Constructive Solid Geometry (CSG) parametric modeling sequence to generate a high-performance motorcycle engine cylinder block. All dimensions are strictly in millimeters (mm). Apply the following Boolean operations sequentially: Step 1: Initialization. Set the global Cartesian coordinate origin (0,0,0) at the center of the cylinder bore on the bottom gasket mating surface. Step 2: Base Geometry (Union). Create a central vertical cylinder with an outer diameter of 75.00 mm and a total Z-axis height of 78.00 mm. Create an overlapping rectangular cuboid on the negative X-axis with dimensions X = 35.00 mm, Y = 70.00 mm, Z = 78.00 mm. Center this cuboid at coordinates (X = -32.50, Y = 0.00). Union these two bodies. Step 3: Main Bore (Subtract). Execute a through-all cylindrical cut along the Z-axis exactly at the origin (X = 0.00, Y = 0.00) with a precise diameter of 54.00 mm. Step 4: Spigot Sleeve (Union). Extrude a cylinder downwards from the origin along the negative Z-axis to a depth of -22.00 mm. This spigot must have an outer diameter of 58.00 mm and an inner diameter of 54.00 mm (matching the main bore). Step 5: Stud Bolt Pattern (Subtract). Execute four full-depth vertical cylindrical cuts of 7.00 mm diameter. The exact coordinate centers for these holes must be: Hole 1 (X = 24.00, Y = 25.00), Hole 2 (X = -24.00, Y = 25.00), Hole 3 (X = 24.00, Y = -25.00), and Hole 4 (X = -24.00, Y = -25.00), forming a strict 48.00 mm by 50.00 mm rectangular pattern. Step 6: Dowel Pin Counterbores (Subtract). Add cylindrical counterbores to the top and bottom faces of Hole 1 (X = 24.00, Y = 25.00) and Hole 4 (X = -24.00, Y = -25.00). The counterbores must be 10.00 mm in diameter and 7.00 mm in depth. Step 7: Timing Chain Cavity (Subtract). Execute a through-all slot cut (obround profile) to create the hollow timing chain area. Center this slot cut at (X = -32.50, Y = 0.00). The slot must measure exactly 25.00 mm in width (X-axis) and 55.00 mm in length (Y-axis). Apply a 2-degree draft angle to the inner vertical walls. Step 8: Cooling Fin Array (Subtract). Apply horizontal cooling grooves to the external boundary of the base geometry along the Z-axis. Cut multiple horizontal grooves, each exactly 2.50 mm in height, leaving solid fin thicknesses of 3.00 mm. Maintain a minimum wall thickness of 4.00 mm around the central bore and timing chain cavity to prevent penetration.

Parameters

Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.