Unbalanced part size in family mold
Unbalanced part size in family mold
(OP)
Over the years I accepted on faith that trying to have parts of quite different size/geometry together in a family mold is a bad thing.
Recently I began to wonder "Why?". Which part suffers? (The big one/little one/both?) In what way do problems manifest themselves? The most obvious would be incomplete filling in one part - but if the gating and runner geometry were biased strongly in favor of the small part, it would seem that it would fill quickly and then the filling of the larger part would proceed as if the smaller one weren't there.
I'd appreciate any input - I think I have exhausted the patience of the tool maker I have been talking to with my repeated "Why?" (or "Why not?")
Recently I began to wonder "Why?". Which part suffers? (The big one/little one/both?) In what way do problems manifest themselves? The most obvious would be incomplete filling in one part - but if the gating and runner geometry were biased strongly in favor of the small part, it would seem that it would fill quickly and then the filling of the larger part would proceed as if the smaller one weren't there.
I'd appreciate any input - I think I have exhausted the patience of the tool maker I have been talking to with my repeated "Why?" (or "Why not?")
RE: Unbalanced part size in family mold
Are you injection molding plastic, or pouring
lead sinkers?
RE: Unbalanced part size in family mold
Injection molding common resins (ABS or Polycarbonate) was the context of my original question.
RE: Unbalanced part size in family mold
RE: Unbalanced part size in family mold
Assuming that this "static balance" can be achieved (or that the parts are so small it is not really an issue), are there other problems, like difficulty getting complete fill on all parts? Or excessive cycle times? Or cosmetic issues (burning, etc.)? Or......?
RE: Unbalanced part size in family mold