Thanks for sharing . This is exactly what I need.

that’s a fairly complex story. pretty much all goes into such calculations, also water cooling channels, or cooling systems as such. however, if it’s for hobby and simple usage, you will be fine with having at least 10 mm thickness around your object. you could even go for less but the walls need to stand some pressure. if you go for more, the cooling process will last longer of course but that is good with some materials.

aleexroque

new

06/03/2019 at 12:02

Hey @cgoflyn, thanks for the reply!

The alluminium walls thickness for the mold design is actually another subject I am doing research about (I guess it also mostly depends on the quality of the Al/Steel), but actually the question I am addressing is regarding the amount of plastic material that should be put into the mold for an optimised filling of the space. (should have specificed this, my bad!)

Thanks!! 🙂

Alex

s2019

warrior

06/03/2019 at 20:32

@aleexroque You didn’t say whether this was for an injection mold or compression mold. I think in either case you want to track this by weight. If the geometry is simple and you can calculate the volume then just multiplying by the density gets you to the weight. If the geometry is more complex, perhaps you can tape the mold closed and fill with water, weigh the water, and adjust with the specific gravity of the plastic you are using.  Having said that, the prediction will be just an estimate. The density of plastics varies, even within a type. For injection molds, there is also the volume of the sprue and the dead space in the injection machine. For a compression machine, your mold design may provide a certain amount of ooze. I think you will probably need to add some margin on the results to avoid voids.

@s2019, a walking book, thx!