I am very new to this area of design and need some advise on this subject
To start with, ignoring any other design concerns, your part has no draft. All plastic injection molded parts require draft to be able to be ejected from the mold without getting stuck. You have 89 faces that need to be drafted at an angle. Most mold suppliers like around 2 degrees of draft or more from my experience but less can be okay.
Second, your part has a lot of undercuts. Typically these require a slide feature in the mold which is a piece of metal that moves perpendicular to the mold halves before they separate and release the part. Your basket has faces that need to be addressed in order to make them moldable in this regard.
From a SW tutorial, here is a slide feature (yellow) in a mold. It moves outward before the mold half separates in order to create the circled feature in the orange plastic part.
In your part, none of your sketches are fully defined. If your sketch has a minus sign next to it or the status bar on the bottom right of the screen says "Under Defined" or if your solid lines are blue then you aren't fully defined. It is very important to fully define your sketches, otherwise changing a feature or sketch could impact the design of another sketch/feature in an unexpected way.
I think they can apply sliders for only 1/3rd part of that cylinder. Rest of the cuts in 2/3rd portion will not have sliders to come out. I am not sure though.
Long way off from it being injection moulded. Metal against metal from the other side of the tool needs 3 degree shut-offs. Sliders moving on the same side with shut-offs against others faces need 3 degrees. General draft on pulling out needs to be 0.5 degree min.
That part also needs an internal slide which will move under the moving half + the other external slides.
Yes you could get it to the point you can mould the part BUT the tool will be very expensive which in many cases makes the part unfeasible. Which means costing need to be looked at.
I am guessing this is a college project?
Yeah CAD project for summer classes
Aaron Solano wrote: Yeah CAD project for summer classes
Aaron Solano wrote:
Can you ask your instructor to join this discussion?
Is it too late to get your money back for the course? It is my opinion that you are not getting your money's worth in instruction.
Is it too late to change schools?
Sketch1 (a simple circle) is not fully defined.
None of your sketches are fully defined?
This is usually mastered in the first class - longgggggggg before getting into an advanced topic like mold design or design for manufacturability.
Here is an updated model that will still work for the project
Does the hole in the center have draft?
Does the cylinder in the center have draft?
Do the slots have draft?
Can this angle be measured (in the real world) - or is it a logical mathematical function of the geometry?
It can definitely be molded however like many have mentioned you need to draft all the slots and hole.
With addition of draft in the center hole of the part and the patterned cutouts as well as a few other minor corrections, I was able to get it to come together. This was more for me to practice getting to this point more than anything.
..if the material was elastic,.. or pulled out by hand,.. no problem.
..otherwise, the center is the challenge (and not cheap).. and would need some creative slide/lift/rotary/actuation/.. and most likely some compromise with how they shutoff.
Paul, I think you missed the much simplified model of this in a later post.
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