Some advice on costing

Discussion in 'Fiberglass and Composite Boat Building' started by pleasedontsink, Mar 24, 2016.

  1. gonzo
    Joined: Aug 2002
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    gonzo Senior Member

    If you want both sides to be finished, seems like the only solution, you will need a male/female mold. At least around the flanges if they show.
     
  2. pleasedontsink
    Joined: Mar 2016
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    Location: Dunsborough, Australia

    pleasedontsink Junior Member

    I only want the inside finished. The flanges will show on the outside but that is ok as they will be covered with insulation and wood, plaster. Basically all you will see is wood, plaster on the outside with a door and finished gelcoat inside the tank when you open it. Im just trying to work out if a 100mm right angle 90 degree flange will cause a problem when coming out from the mould or will I need a mould that I break apart to get the part out. As I need the walls together to meet flush a 2 degree angle on the flanges will not work.

    I really appreciate you all taking the time for the responses guys.

    cheers.
     
  3. ondarvr
    Joined: Dec 2005
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    Location: Monroe WA

    ondarvr Senior Member

    You will typically get a bit of shrink which will cause the flange to warp slightly, so keeping it at 90* can be tough, using a blended catalyst can help. The thicker the flange, the more it will warp.
     
  4. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    You can adjust for that on the mold. It is not too critical, since they don't show. As long as the outside edges are further apart than the inside edge, the bolts will tighten the seam. There will be no problem taking the parts of a male mold, providing there is some draft to it.
     
  5. pleasedontsink
    Joined: Mar 2016
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    pleasedontsink Junior Member

    Awesome. Thanks so much. Exactly what I am after.
     
  6. redreuben
    Joined: Jan 2009
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    Location: South Lake Western Australia

    redreuben redreuben

    Pleasedon'tsink,
    If you wish to make a production mould it will need a shape or plug to cast it off, this can be a one off made of a myriad of different materials usually dictated by the shape, if it is mostly plat panels you can use gloss finished formica to make your shape, if it is compound curves then it gets trickier. One common method in the industry is to use a similar shape product and then cut, fill, stretch to requirements and then apply a finish before moulding.
    As for construction, I don't imagine the water is going to be incredibly hot so a quality gelcoat with a vinyl ester skin should suffice, the rest can be polyester.
    If you expect to produce in numbers you may well find the bigger suppliers will do your laminate design for you.
    I have extensive experience in fibreglass production including baths and spas, I live near Fremantle in WA, If I can be of any further help feel free to send me a private message.
     
  7. gonzo
    Joined: Aug 2002
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    gonzo Senior Member

    The temperature won't be higher than in a normal bathtub.
     

  8. pleasedontsink
    Joined: Mar 2016
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    Location: Dunsborough, Australia

    pleasedontsink Junior Member

    Thanks redreuben,
    Much appreciated. Sorry for the late reply. I have been away for a while.
    I will definitely hit you up for some advice and some good supplier information around Perth etc.
    Thanks very much for your response. It is very handy to have someone in the know close by.

    Cheers.
     
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