but the thing I don't know is what I do for the second piece for the helmet, Does it need to have a positive void? Like you explained with the Sword handle?
No. You do not need to made a two piece mold for most sections of the helmet. The molds of the Jaw section and the Back of the head are 1 piece 'Open face' molds. The reason the the Brim of the helmet is a two piece mold is so that the underside can be cast with the top of the brin in one piece. These molds are used bby brushing resin into them from the open side.
The sword handle is a two piece mold because both sides of this piece are critical.. they both have to be exact. However, the interior of a helmet is not critical, does not need to be exacting, as itt is inside, unseen and will be covered with padding.
Just out of curiousity, why would you choose the sword handle as your example when I've already shown you what a helmet mold looks like?
Oh, BTW Sigma the ball keys are made by pressing the end of a wide paintbrush into the clay that the first piece is laid up in. iT makes a 1/3 round negative cavity that the rubber or resing fills in. Then after flipping the first half over to mold the other side, the bext part of the mold flows around the positive mold key, making a locking mechanism that ensure that your molds fit together tightly.
End of lesson for today. Be sure to have your homework on my desk by 9 am Monday morning. :lindsey:
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