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Author Topic: DIY Metal Beigoma Casting  (Read 81 times)

Joah

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DIY Metal Beigoma Casting
« on: November 21, 2020, 06:35:43 PM »

Hello Everyone!
It's been a while since I've posted. I've been busy learning how to make molds for casting Cerrotru allow, a non-toxic mix of tin and bismuth. Why learn this? With the rarity of beigoma tops in the states I wanted a way to take my 3D printed beigoma and cast them in metal. To make a beigoma good in the arena you need to heavily modify them. Since, I am quite new to modding beigoma I didn't want to alter my antique one and make a mistake....nor did I want to wait close to a month for new ones to be delivered. So I decided to make my own...again...!
IMG_20201117_000125975 by Joah Tang, on Flickr

The first step I took to making my own metal beigoma was to redesign my original 3D printed ones.
beigomamasters by Joah Tang, on Flickr

I did this in Tinkercad, a free 3D design software. I printed them out and gave the tops a test spin. I did my best to sand and balance them before moving on to making a mold. I used PETG for the print and sanded it smooth with 400 grit sandpaper. I found a good tutorial on Crafsman YouTube channel for making low temp metal molds with EasyMold silicone putty. I followed these two videos:
https://youtu.be/1evLu0m2yCU

and

https://www.youtube.com/watch?v=piG04g76Ma8

Side note the CrafsMan is one of the best maker channels on YouTube in my opinion steady craftin!!!!

...anyways back to the tops...
Once the supplies arrived I took some sulfur free clay and Legos to make a two part mold.

IMG_20201114_192731255_HDR by Joah Tang, on Flickr

I was able to make two molds from 1Id of EasyMold. My third mold was made from 100% silicone and cornstarch. For a more in depth tutorial check out this tutorial on mold making from the amazing CrafsMan:
https://youtu.be/h6kh2RJl1dQ

After the molds had cured I took some Cerrotru alloy and melted it down in my HotPot2, basically a hand held foundry.  The nice thing about this alloy is it melts around 281ยบ F and it contains no led! The alloy is made in PA and can be found here: https://boltonmetalproducts.com/products/cerrotru-bolton-281

IMG_20201114_204351210 by Joah Tang, on Flickr

Here's a quick video of my dragon beigoma being casted.


After lots of sanding I spun them and quickly realized yoyo string was not going to work so I made my own by doubling the string wraps in this yoyo string tutorial:
https://www.youtube.com/watch?v=yD8o6SnxadA&t=292s

I found 12 - 14 wraps work best. Also winding the string on the tight side helps too.

IMG_20201121_164411323 by Joah Tang, on Flickr

To sand the beigoma down I used a wood file and 100 - 800 grit sand paper.

IMG_20201114_215733634 by Joah Tang, on Flickr

IMG_20201117_000125975(1) by Joah Tang, on Flickr

IMG_20201121_135943525 by Joah Tang, on Flickr

Here is a compilation video of the beigomas battling:
https://youtu.be/IPOV6o8CqA8

In the future I hope to improve my design to spin longer in canvas arenas. Right now the Cerrotru beigomas will spin for 30 seconds in a canvas arena but will come close to 2 minutes on a plastic surface! It may just be my arena that is effecting the spin time...it will be upgraded in the future too. You can find the STL files here: https://www.thingiverse.com/thing:4661218

My next iteration will look something like this.
newbeigoma2 by Joah Tang, on Flickr

newbeigoma1 by Joah Tang, on Flickr

If anyone has any ideas, tips, or questions let me know I would love to discuss them!


 


 
« Last Edit: November 21, 2020, 06:43:15 PM by Joah »
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Texture

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Re: DIY Metal Beigoma Casting
« Reply #1 on: November 21, 2020, 07:16:16 PM »

Amazing! Never have I seen anyone do that sort of thing here. For your string I would suggest using chalk/mason line, although I can't quite remember what number works for beigomas; I know it's thicker than no. 21 cord.
You could make some decent money from making those!  8) 8) 8)
« Last Edit: November 22, 2020, 04:29:56 PM by Texture »
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Jeremy McCreary

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Re: DIY Metal Beigoma Casting
« Reply #2 on: November 21, 2020, 09:42:50 PM »

Brilliant! Every part of it.

Of course, using LEGO to frame the mold was especially brilliant.
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Playing with the physical world through LEGO

the Earl of Whirl

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Re: DIY Metal Beigoma Casting
« Reply #3 on: November 21, 2020, 11:06:23 PM »

Wow!!  Very impressive.
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Happiness runs in a circular motion!!!

lincolnrick

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Re: DIY Metal Beigoma Casting
« Reply #4 on: November 22, 2020, 11:06:10 AM »

Joah: 'Side note the CrafsMan is one of the best maker channels on YouTube in my opinion steady craftin!!!!'

Even though I'm not a caster/maker, I found the CrafsMan channel a while ago and really enjoy his creations. Great video production and style. A unique character to be sure. Keep on steady craftin!
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