Plastic Injection Molded Part Tolerances
Plastic Injection Molded Part Tolerances
(OP)
I'm looking for a site that would have any information on tolerances that can be achieved with plastic injection molded parts. I understand that this could change from material to material. I have much more experience with metal casting part design. There is at least an agreed upon tolerance standard that pretty much all foundries follow and that is the one we use for metal sand castings. Is there such a set of standards for plastic injection molded tolerances? Is there a site where I can get this information? Thanks in advance.
Pete Yodis
Pete Yodis





RE: Plastic Injection Molded Part Tolerances
RE: Plastic Injection Molded Part Tolerances
Design your part and tolerance it they way you want it. Do whatever necessary to verify those tolerance by testing it, build a machine parts, or whatever. Once you do this, give it to several vendors. I'd suggest 10 of them ranging from big to small. Let them bid the quote, if they take it, they are responsible to make your part to your tolerancing. See how many of them take the bid. If they all take the bid then you kinda get a "feel" what is standard and what is not.
Let me know if you find a standar, I sure can use it too!
APH
RE: Plastic Injection Molded Part Tolerances
Many vendors will be responsive to RFQs that include a "please tell me if my design is making this part unnecessarilly complex to produce, or expensive, and do you have any suggestions for a better design."
Vendors that respond to such requests are probably the ones you want to form relationships with anyway.
Yes, there is some aspect of "please do my job for me" in this approach, but if the big picture is right, it can be advantageous to both parties.
RE: Plastic Injection Molded Part Tolerances
RE: Plastic Injection Molded Part Tolerances