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URL: v3 AI Mug OnShape drawing
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v3 Shelled AI Mug Using OnShape
Available on the Downloads page
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This differs from the v2 drawing (below) in that the plaster pouring cavity is formed by shelling (hollowing) the back side (v2 was formed on the front side, by revolving and sweeping the mug profile and extruding the side walls). This v3 shelling method has several advantages:
-No sketch offset or extrusion was needed to make the outer wall.
-Because the first action is to extrude everything as one solid mass, corners of outer 3D perimeter can be heavily chamfered (reducing the amount of plaster needed to fill the mold).
-The mug's outside geometry (offset inward by 0.8mm) is revolved, swept and bevelled by cutting into the block. Shelling to the same 0.8mm wall thickness, from the backside of the block, produces the cavity needed. This approach offers flexibility in the mold wall thickness (e.g. a good printer can handle 0.8mm thickness well, thus reducing print time and filament use).
-The last steps, after shelling, are chamfering the outside inner corner (where it needs to print thicker) and cutting the holes for the natches.
-Our v3 natch system continues to work well with this.
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