r horning on sun 25 jan 04
Hello all,
I am having a problem with slip casting. I created a part for a conceptual clay
piece.It was like a large Lego, about the size of a cinder block. On one large side of
it was the relief of a computer keyboard. The other side had seven mouses (mice?).
They were randomly spaced. This was computer generated. I then had the piece
made by another computer using a rapid prototyping process. I took a two part plaster cast of the part. Next I made a rubber master part so that I could take
several plaster molds and start making building blocks to create a structure.
I used actual measurements from the keyboard, although I made the keys slightly smaller to create a small flat between them. There is at least 7 degrees draft on all surfaces. My attempts at casting were totally unsuccessful. I believe it was due to each key and mouse shrinking and locking the piece in. I have only slip cast very simple cup forms in the past so I don't have the experience to trouble shoot. There must be an optimum depth of relief which I must have surpassed. And maybe the keys were still to close together. Does any one have any insight that will help me determine the parameters for the relief? I am ready to begin the process all over again. This time I will be doing it on shapes the size of hard brick. Much smaller than last time. Is it possible to get an entire keyboard on that size? I will also generate the male part, instead of the female I did last time so that I can pour a rubber master part directly into it.
I am looking forward to your responses before I proceed. It was quite costly to blaze ignorantly forward last time. Sincerely, thank you. Rebecca
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