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The pink one is the original climbing hold and the two others were made inside the silicone mold from HDPE plastic flakes in the injection machine as in the above stated method
As an update, we were successful using silicone molds with our injection machine. We had previously cut molds to make flat objects like coasters using a laser cutter, and we just used the flat top and bottom pieces from those molds with the silicone inside to do this. To make a climbing hold, we first molded it in a box so the result was a cube shaped silicone mold with a big empty cavity. The mold we used was sold in two containers, one with the majority of silicone inside and one smaller one that gets mixed in before molding. It cost about 8 USD for the 0.5 kilogram of silicone in Vietnam. Then we put that finished mold between our lasercut pieces (the top one has a hole and welded nut to interface with the injection machine and the bottom one is just a flat piece. We were able to hold the 3 objects together by using the holes which we already cut for bolts in our lasercut piecese. During injection, we were careful to not overinject because there wasn’t so much pressure holding the 3 objects together. The result was acceptable, and we think that silicone molds inside lasercut pieces can be an alternative to expensive CNC cut aluminum molds while still having great detail.
Hi s2019, thanks for your thoughts. If injecting doesn’t work for this, we might try just putting the mold in an oven and adding shredded flakes until it’s full. I’m worried about air bubbles with that method but it’s worth a shot. If you have any ideas for how to make this sphere, would be interested to hear. Cheers
That’s very useful infromation, thanks Patrick! I’ve connected with Duc and hopefully we’ll be getting that far soon 😀
Hi Duc, really great to get your message. I’ll contact you soon.
That’s great news, and I’ll go that route as well and try to get a motor similar to yours. I love not needing to mess with a gear box in the beginning.
Cheers and happy holidays!
Hi Patrick, thanks for the post! I’m considering using a winch motor such as you and have a few questions. Do you notice any overheating from a long time running it or any other problems? What is the rated kg of your motor? I am looking at a 500 kg or maybe 1000 kg motor. Thanks, Ben from Vietnam
By the way, I love your bowls. They look very sturdy and a bit unfinished which adds to the charm and reminds me of the thick hardwood bowls which my grandpa carves
I’m living in Hanoi and am seriously considering getting involved or starting a Precious Plastic project in that city. Apparently, another group in Hanoi made a few machines already and I’m trying to get in touch with them. I’m in the research phase now but am very interested in making something that can have a larger impact such as the brick making that you want to do. Please feel free to connect with me on facebook at https://www.facebook.com/ben.baron3 or by email at [email protected].