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Rotating Bowling Ball Cup

by 3dRay Sep 30, 2016
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Updated the design based on Yankees177 comment. Much simpler.

How big is the nut suppose to be? For some reason its showing up as 150mm in 3d builder.

It is about 12mm across. I just loaded the stl file for the Nut into 3d Builder and it looked to be correct. Maybe it got scaled somehow?

Ok, thank you.

This is a really cool idea. I will definitely print one. This will help a lot when I want to clean the oil off my bowling balls. Thank you so much.

Your very welcome! Enjoy!

Printed 4, some washers came out better than others (I suspect that was the fillament). Other questions. 1. Why the hole in the top of the ball cup? Also I get better spin if I loosen the nut but more movement. Too much of a gap and the spacers/balls come out. Any tips? Should the screw be spinning when the top spins or no? Thanks!

Maybe use a higher resolution to print the bearing lock in washer if you have not tried this yet. If it is too tight fitting, maybe scale down the washer just a fraction and re-print. The hole in the top and bottom was in case it is needed to be locked (no spin). A pin of some sort can be inserted to lock the top to the bottom sections. If there is too much gap between the top and bottom where the balls fall out, then something is surly wrong. It is more then likely the spacer that sits on the bearing before the top in put on. It sounds like it is too tall for some reason. It should provide just enough clearance between the top section and the actual bearings. The top should just be touching the ball bearings. The top section revolves around the inner section of the bearing, so the bolt and the top section should all spin together. Also note that just spinning the top on its own will not provide a lot of spin. The weight of the ball is needed. Hope this helps. Enjoy!

Comments deleted.

This is great, I made one and it works well (in the process of making one for my whole team). I have one question on this design, and I think I know the answer, but why is there a flimsy little washer that holds the center bearing in. That is the part im most afraid of snapping. My guess is you did this to not have to worry about supports if you made the center solid and thicker. My first print go-round, the middle of the hole of the base with the center bearing didnt come out as nice as was needed for a great hold and I also was concerned about breaking. This thing dropped out of my hand from about 4 feet up and hit the floor and came apart (luckily it was the washer) but I want to be able to throw this thing in my bowling bag and not worry about it falling apart. Even with supports I think a solid center area (or maybe even a thicker locking part) might be a good upgrade.

I see your point. Yes, for the most part the bearing locking washer was used to eliminate any needed support. But in hindsight only a small lip on top would be needed to hold the bearing in place if inserted from the bottom. I'll give it a try and re-post if it works when I get some time. Thanks for the feedback!

Added the Base Version2 file to replace the Base file. Using the new Base Version2 component eliminates the need for the bearing retainer component.

Works beautifully. If you want to take out the spacers, it can hold 37 bearing balls. I don't think it is worth it, but that is up to my wife, the bowler, to decide.

I had tried using the channel filled with ball bearings initially and quickly came to realize that only a small amount, separated by spacers, were needed to do the job. Thanks for the feedback and sorry for the long delay in response.

This is very cool, nicely done.