Like ribs, the wall thickness of a boss should not exceed 60% of the main wall thickness.
The gate is where the molten plastic enters the mold cavity. Placing the gate in a hidden or easily trimmed location is essential. Also, consider that the gate location influences how the plastic flows and where weld lines (where two flow fronts meet) will occur. injection molding part design for dummiespdf exclusive
Sharp corners are the enemy of a good plastic part. They create "stress concentrators" where the part is likely to crack under pressure. They also make it harder for the molten plastic to flow through the mold. Like ribs, the wall thickness of a boss
Aim for a wall thickness between 1.5mm and 3mm for most materials. If you must change thickness, use a gradual transition (a ramp) rather than a sharp step. Mastering Draft Angles Also, consider that the gate location influences how
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Gate Vestige: There will be a small "scar" where the plastic was cut away from the runner system. Place this in a hidden area.Ejector Pin Marks: These small circular indentations occur on the "B-side" (the inside) of the part. Make sure your functional surfaces aren't located where a pin needs to push. Conclusion
A draft angle of 1 to 2 degrees is the industry standard for most smooth parts.