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the Technology Interface/Spring 2008 Klein Once the wood finishes have cured, the model must be split in two. Since a weak joint was planned by gluing paper between the two center boards, this process is quite simple. A sharp, thin chisel was aligned with the weak glue joint and is driven into the joint with a hammer, which splits the model along the weak joint. (Figures 11-13) IV TOOLING PLASTER PATTERN MAKING Tooling Plaster (US Gypsum Ultracal 30) is a “super-strength gypsum cement recommended where extreme accuracy and great surface hardness are required”. [5] Tooling plaster has been used for centuries in the pattern making industry. It is extremely hard and dense and will replicate fine detail from whatever surface it is cast against. A framework was built around the model halves to hold the plaster while it cures. (Figure 14) The plaster is mixed in a way to reduce air bubbles, then poured over the model halves and allowed to cure. (Figure 15) Page 5PDF Image | 12 mil Reinforced Polyethylene
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