Piston Fixture and CNC
Piston Fixture and CNC
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Our task in senior design was to design and implement a dimple pattern for a piston. This covers the fixture and machining for the piston.
Our task in senior design was to design and implement a dimple pattern for a piston. This covers the fixture and machining for the piston.
In order to machine the piston and preserve its critical surfaces, we had to design a fixture to safely constrain it. After consulting with our industry partner, UEM Pistons, we determined the best way to hold the piston was from the oil ring and the wrist pin bore. We 3D printed our fixtures out of PETG with 100% infill, we determined to print our fixtures to save the time and cost of machining them as we only had to machine a couple pistons. PETG was picked because it is a very strong material, but we decided to make them single use anyways due to the clamping forces that would be exerted on them by the vices in the mill. The piston is also supported on the bottom with a 3D printed piece with the same contour as the piston. I designed the fixture in SolidWorks using a light scanned CAD file of the piston.Â
In order to machine the piston and preserve its critical surfaces, we had to design a fixture to safely constrain it. After consulting with our industry partner, UEM Pistons, we determined the best way to hold the piston was from the oil ring and the wrist pin bore. We 3D printed our fixtures out of PETG with 100% infill, we determined to print our fixtures to save the time and cost of machining them as we only had to machine a couple pistons. PETG was picked because it is a very strong material, but we decided to make them single use anyways due to the clamping forces that would be exerted on them by the vices in the mill. The piston is also supported on the bottom with a 3D printed piece with the same contour as the piston. I designed the fixture in SolidWorks using a light scanned CAD file of the piston.Â
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