In the boss drawing It shows the hole is 1.10 in the cavity mold drawing it's 1.30. Shouldn't they be the same?
the Boss Cavity has a wall of .10
so 1.10 + (.10*2) = 1.30
Seems like it's resulted of draft
Yeah I was thinking maybe that's why.
There doesn't seem to be draft on those parts, and definitely not enough to account for that kind of dimension difference.
I think we need more info.
Not enough here to go by.
How was each part created?
Using the mold design software?
Is one a subtracted body of the other?
Is that 1.30 dimension to the hidden line geometry?
Better look at it a lot closer...
Gee. If I only had the internet to go to back when I was in school.
I would never have had to figure things out myself...
Here's the model of the actual part.
Eric. Was this dimension due to the shrinkage factor that is added to a mold cavity? Mold cavities are made oversize to some degree so that the material being molded will be the right size when it comes out of the mold. Do a Google search on molding and shrinkage. Without seeing the rest of the dimension of the mold cavity, I would guess the part of the mold that makes the hole in the boss was made oversize to allow for shrinkage.
As Sarah say's, I think you either shelled your part out the wrong direction, or you are measuring from the wrong side of the material. All depends what your intention was.
Jody I stand corrected. Sarah was right. I need to pay closer attention.
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