What material is that based on?
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Tungsten
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Take that, 1to1!
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I guess that makes sense if you think about it. Tungsten (19.25 g/cc) is ~6.75x denser than 7068 Al (2.85g/cc). While that’s a crazy difference, 2.4kg is almost 37x heavier than your average 1A yoyo.
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When you lay out the math like that it make sense.
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Thanks for the thought-provoking post. I think if you could push the dia to 65mm, you might could carve out some of that center weight and make it more “playable.” Just achieving 2.4kg might be impossible for the OP though if he’s restricted to 65mmx45mm (unless, perhaps, you have some Osmium laying around @Mei_lito).
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Osmium 
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Osmium weight rings or bust.
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This thing would suck to machine. Just saying.
Also I’m curious is a standard m3 set screw would be good enough as an axle with that much weight
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How come?
I don’t know on the axle. I made it longer than I usually do to hopefully help with the extreme weight but I don’t know if it matters.
Tungsten is harder and brittle compared to titanium which is usually considered hard to machine compared to al or steel or even magnesium.
Your tools will wear down faster. Your cutting speed has to be heavily reduced and it could chip as you cut it due to how brittle it is.
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Honestly and it has it’s downsides but a solid gold YoYo would probably be easier to make and might even be more cost effective as labor is probably still higher than material costs in this equation
Regardless this imagined yoyo would not be cheap to make
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That’s like $300,000 of gold, but I suppose it could just be straight cast, and finished from there, probably wouldn’t take too much time comparatively
I’ve severely underestimated the raw value of gold lol 2.4kg I guess is 230k in gold vs 700 in tungsten….
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Simple, fix for that…
Just recalculate the specs of the yo-yo so that it would only way one full kilo.
By reducing the weight, you scale back the price to $97,156.
So that could be an option🧐
Honestly… If it was me, I would just trashcan the whole project and go down the street and buy a 2.4 kg pizza.
While eating the pizza, I would smile after every bite in recognition of all the money I saved by not making a 5 pound paperweight
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Especially right now, as it’s basically at an all time high. Here’s a 10 year spot price chart (in USD/ Troy oz).
Most of the large gold mines I work for use a rolling 5-year average spot price for mine planning and cutoff grade, so they’re making a lot of money right now, even when they make mistakes and screw things up.
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Wow, I didn’t know we had someone who actually works for a gold mine on the forum. The username makes a lot more sense now lol.
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