Here is one of my first yoyo designs. I have access to a CNC lathe at my school so I hope to machine a yoyo at some point. I’m concerned about the weight distribution and I don’t know if there’s enough weight on the rims. I’m also not 100% sure how weight distribution translates to feeling while playing. Let me know what you guys think!
Specs:
Width: 48.0 mm
Diameter: 53.0 mm
Weight: 34.1 g
Material: 7075 Aluminium
Is that weight per half? Its either pretty heavy overall or ultra light overall 
Thats awesome that you have access to a lathe. Hit me up if you want me to draw something up for you 
34.1g is weight of the whole yoyo + bearing. I haven’t got to using the lathe yet so we’ll see how that goes
Ouch, thats light. Can always do 6061 if you want to up the weight a little bit. Also could just bring that first cut of the rim in with the 2nd cut and that’ll be your rim weight.
You’ll want to get that weight up above 60g, and probably pick a simpler shape for your first design if you’re turning it yourself. There should usually be a considerable amount of material near the rims.
Also check that outer edge-it looks uncomfortable.
Anyhow, welcome to YYE!
idk if anyone’s pointed it out yet, but it looks like your rim weight is the same as or less than your center weight so you might want to up that
Welcome to the Forums! Good to see you’re also interested in making a yo-yo. When it’s ready, there is a very unique feeling of pride and accomplishment.
I don’t know, however, if you actually play. If you do, you’ll know that yo-yos have an “optimum” weight interval between 60 and 70g (60g is light, but OK - 70g is pretty heavy in my opinion). 34g is lighter than a 2A yo-yo.
Let’s account bearing + axle to weight 4g. That’s 4g right in the center of your throw. There are 30g left… at a guess, I’d say 6.5g or 7g are in the inner walls (which from the drawing I’m throwing something around 4mm thick), which added to bearing + axle corresponds to 1/3 of the weight in the middle.
It’s just all rough numbers and very rough calculations. I didn’t think too much about this at all, neither used a CAD.
But I’d say that 1) Your yo-yo has a less than optimum weight distribution and 2) it it VERY light.
You could work at the inner surface in order to change the distribution and try to make the yo-yo heavier while changing the distribution.
As it was already stated, I also think the catchzone doesn’t seem too comfortable.
Keep it up! Every design can use some adjustments in the beginning stages, and you’re almost there!
Ah! I just realized I made a mistake in my post. The total weight of the yoyo is 64.1 g, not 34.1 g. Each half is just about 30 g. That’s my bad. 64.1g is pretty normal but I can see how my weight distribution is off.
Also, I’ve been yoyoing for 4 years and have been using Fusion for about the same amount of time so I thought I’d give designing a yoyo a shot. Thanks to everyone for the feedback!
If you haven’t watched these, or missed the part about rim weight, this video series shows a heuristic for estimating relative rim weight:
The heuristic is to extrude the cross-section and then find the center of mass. The height of the center of mass divided by the height of the cross section gives you a percentage which for most yoyos will be between 50% and 65%. Yours appears to be around 50%, which means it’ll be quite unstable for a yoyo of its mass and dimensions.
This isn’t the final word on yoyo inertia, but it’s a quick check that you can do yourself to see where it’ll stack up.
@MarkD Thanks for the suggestion! I watched that series of videos a few weeks ago but I probably should have written that part down. I’ll be sure to use that to check my designs.
What if Side Effects were shorter?
Imagine…
Small Effects
Aggressively shortened to just barely fit a 12mm axle. A tap-through version would probably require a 10mm axle to keep it from sticking out into the cup. Had to drop the o-ring since there wasn’t space to keep enough taper contact otherwise.
Also, here’s a 7068 yoyo that might use them.
(This idea owes everything to one drop, who shares so much about their designs and methodology that I can simply search for a question and find that they already answered it years ago here or on facebook)
Love the profile on this one!
Just made this up today, wanted to make something not so mainstream any thoughts on it?
Around 62 grams
56 diameter
43 width
4.5 gap
I’ve been wanting to make a singular titanium yo-yo for myself, but I just want to know how much it will cost for just one? I just started trying to learn cad, and does anybody know how to get a manufacturer to do it for me. Thanks for any help.
Minimum run would probably be 5. Expense would probably be around 800-1kish. If you want me to design one to your perfect specifications, DM me.
My initial design goals for this project were to a combination of stability, power, and lightness without using a bimetal design. This was achieved by just using 7068 and going big. The larger diameter really allows for it to get a lot of rim weight despite the lighter mass, and the 7068 allows the walls to be kept as thin as possible. With these two ideas I basically limited the diameter based on the shop’s available 7068 barstock and kept a wall thickness of around 1mm.
Overall the ideas behind the project were very simple (rim weight = yes, walls = thin) but I’m incredibly pleased with how it turned out. It’s a model that pushes the envelope of monometal Al performance, and plays phenomenally well.
Ah, I remember your CAD for this! Super clean design. Love the light blue on that.
Ye, I’m super happy with the color. Looks even better in person, I keep just staring at it.
