It’s always fun to see what Kenneth Maxon is up to lately on his robot projects.  He has a well equipped CNC workshop and does intricate work that is beautifully detailed.   Here’s a photo essay of his latest project he sent along so everyone could see:

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Here’s a view of the mold which is in 4 parts.  It’s capable of making parts in 2 different configurations…

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Mold parts clamped together and ready for the 2-part polyurethane treatment…

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The 2-part plastic is not poured, it is injected.   Kenneth says:

I’m often  asked how one gets the material to ‘pour’ with such a high surface area to  cross section aspect ratio.  The trick comes in using a large bore syrenge to  push the material through the tool.  This also helps to cary some of  the smaller air  bubbles through and out by letting excess material overflow from the air relief.

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Here’s what the parts look like after the plastic has cured, first configuration…

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And here’s the second configuration.  Kenneth writes:

After the first part comes out it is pretty easy to get a nice surface finish on all of the parts that follow.  The first part comes out a bit ratty as, no matter how well the  tool is cleaned, the  molding process pulls ‘magic’  chips out of it.  Additionally, the 2-part materials and  the mold release wax have a small chemical inter-action with the soap  film left when  washing the tool.  Once the first part is pulled from the  tool, all of the following parts come out with a great surface finish like those shown in the photo.

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This photo shows the molded parts installed on Kenneth’s robots.,.

Details on how these molds were machined can be had on Kenneth site.

 

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