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  • He Who Shall Not Be Named
    Moderator
    • Aug 2008
    • 12186






























    Who is John Galt?

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    • He Who Shall Not Be Named
      Moderator
      • Aug 2008
      • 12186



      Just another day in the shop.
      Last edited by He Who Shall Not Be Named; 12-09-2023, 04:31 PM.
      Who is John Galt?

      Comment

      • He Who Shall Not Be Named
        Moderator
        • Aug 2008
        • 12186





























        Who is John Galt?

        Comment

        • He Who Shall Not Be Named
          Moderator
          • Aug 2008
          • 12186































          Who is John Galt?

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          • rwtdiver
            Vice Admiral
            • Feb 2019
            • 1729

            This is Excellents at its best David!

            No better words I can find to express what I am seeing here. Your photos are worth 1000 words. Thanks again for taking the time to share them with us.

            Rob
            "Firemen can stand the heat."

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            • Albacore 569
              Commander
              • Sep 2020
              • 294

              Enjoying the Albacore construction. It is important in 1953 just how new & revolutionary the many concepts introduced in this boat were when viewed, mentally suppressing present day hindsight what is commonplace now. It was an exciting time at Portsmouth NSY then what was developing and evolving.

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              • He Who Shall Not Be Named
                Moderator
                • Aug 2008
                • 12186

























                Who is John Galt?

                Comment

                • He Who Shall Not Be Named
                  Moderator
                  • Aug 2008
                  • 12186



































                  Who is John Galt?

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                  • DrSchmidt
                    Captain
                    • Apr 2014
                    • 896

                    Why do you cut the master in two and then make two separate molds? When I learned mold making, I was taught that you loose precision by cutting masters. Instead I was taught the method using parting planes.

                    Comment

                    • He Who Shall Not Be Named
                      Moderator
                      • Aug 2008
                      • 12186

                      Originally posted by DrSchmidt
                      Why do you cut the master in two and then make two separate molds? When I learned mold making, I was taught that you loose precision by cutting masters. Instead I was taught the method using parting planes.
                      It's easier to handle half of a master than an entire master. Also, when it comes to making the tools, I prefer to do the glove and case in one sitting, not two.



























                      And I suppose it's how you're taught; both methods have their advantages and problems.

                      David
                      Who is John Galt?

                      Comment

                      • He Who Shall Not Be Named
                        Moderator
                        • Aug 2008
                        • 12186





















                        Who is John Galt?

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                        • Marylandradiosailor
                          Lieutenant, Junior Grade
                          • Nov 2021
                          • 23

                          hi, question on the mold technique above (obviously I don't have much expertise on casting), I assume you are referring to the soft inner liner as the "glove" and the outer frame as the "case".

                          Do I assume correctly that as you make hulls the glove will wear out and that you can make replacement gloves and keep the same case?

                          It seems that it would be difficult to make replacement gloves that would fit tightly against the case.

                          This is a most interesting series. Thx for response, Khim

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                          • He Who Shall Not Be Named
                            Moderator
                            • Aug 2008
                            • 12186






















                            Who is John Galt?

                            Comment

                            • He Who Shall Not Be Named
                              Moderator
                              • Aug 2008
                              • 12186

                              Originally posted by Marylandradiosailor
                              hi, question on the mold technique above (obviously I don't have much expertise on casting), I assume you are referring to the soft inner liner as the "glove" and the outer frame as the "case".

                              Do I assume correctly that as you make hulls the glove will wear out and that you can make replacement gloves and keep the same case?

                              It seems that it would be difficult to make replacement gloves that would fit tightly against the case.

                              This is a most interesting series. Thx for response, Khim
                              Correct. The rubber glove gives form to the eventual GRP laid up parts.

                              The outer case (strongback/case/shell/mother-mold) keeps the floppy glove in proper shape during the lay-up process.

                              The initial glove is either poured into a pre-formed mother-mold (BJB's TC-5050) containing the master, or the glove is formed over the master directly, and the case formed over the cured rubber later (BJB's TC-5040).







                              Once production work has fried the glove you simply mount the mother-mold over the master(s), punch sprue holes into it, providing tall sprue and vent channels (gravity is your friend) and pour in a batch of TC-5050. Done. The annular space between master and case is filled with rubber.

                              Who is John Galt?

                              Comment

                              • DrSchmidt
                                Captain
                                • Apr 2014
                                • 896

                                The picture of the prop for the Nautilus is of the S.S. Great Britain, isn't it?

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