Hex Nut Challenge: Clay Molding

Using art clay to mold and manufacture scale Hex Nuts.  Jedion357 threw down a challenge on TerraGenisis to create a DYI Hex Nut.  Colonel Shofer suggested a latex mold using 2 part epoxy as the casting agent.  Brain storming on the idea, I suggested using art clay as an alternitve mold material.  The Colonel asked that I follow up with the project.

Hex Nut casting using 2 part epoxy and resin as casting materials.  Resin on the left hand side, epoxy on the right.  Impressions taken from a 4mm hex tool head and a 1/8 square plastic rod.  The resin setup without bubbles and cleaned up from the clay with minor effort.  The epoxy suffered a 50% failure rate from bubbles and still seemed a bit rubbery 24 hours after casting.  The cleanup was a bit of a pain – the epoxy is clear & it is rather difficult to identify what material is the casting and what is flash.  I would recomend resin as the prefered casting material for DYI Hex Nuts.

hex nut

hex nut z

  1. #1 by xenite on January 17, 2008 - 12:00 pm


    I wonder if push molds would be a good way to create hex bolts?

  2. #2 by chicagoterrainfactory on January 17, 2008 - 1:31 pm

    I think this would work with a one sided RTV mold. After pouring the resin, scrape the top to get a consistant height on the bolts. The problem would mixing such a small amount of resin. 10 of these 4mm hex nuts would only be a gram or two of resin. I waste that much just dribbling down the side of the mix cup.

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