[PSUBS-MAILIST] Pin Ball Wizard

[Sean T. Stevenson via Personal_Submersibles]

What is the diameter of the lead balls? Interesting stuff.

Sean


On December 4, 2016 7:19:03 PM MST, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>Sean,   When I started this project I did a bit of research on how sand
>goes thru an hour glass.  I managed to find a fairly detailed study on
>the physics of the whole thing.  One priority is that the balls are in
>fact round and assuming they are then as it turns out you need to have
>a ratio of 5 to 1 , 1, being the diameter of the balls and 5 being the
>diameter of the hole that they will be going thru.   So my hole is in
>fact 5" in diameter and with it open there is absolutely no way the
>balls can get lodged some how and not come out.   To be sure I couldn't
>explain physics behind it but I think it has to do with the coefficient
>of friction between the balls encompassing the open 5" hole.   I will
>keep testing as I make more lead balls.  The hopper can holed a lot
>more than what I just tested.
>
> 
>
>Brian  
>
>--- personal_submersibles at psubs.org wrote:
>
>From: "Sean T. Stevenson via Personal_Submersibles"
><personal_submersibles at psubs.org>
>To: Personal Submersibles General Discussion
><personal_submersibles at psubs.org>
>Subject: Re: [PSUBS-MAILIST] Pin Ball Wizard
>Date: Sun, 04 Dec 2016 15:21:50 -0700
>
>Brian - is there any concern about the balls packing in tight due to
>vibration over time and not releasing?
>
>Sean
>
>
>On December 4, 2016 1:52:27 PM MST, Brian Cox via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
>Hi All,
>
>My drop hopper works like a charm !   I just successfully dropped about
>130 lbs of lead balls.   One nice thing about it is that the disk
>stopper, that prevents the balls from falling out, doesn't really see
>the total weight of the balls that are in the hopper.  Most of the
>weight get distributed to the spherical hopper wall, so there is not
>the stress on the turning screw.  The turning screw is Acme stainless
>thread ( 3/4")  , actually what turns is the screw and the short piece
>of thread is what is attached to the disk holding plate which falls
>out.  It was a trip pouring all these balls into the hopper !   I need
>to have somebody inside releasing so I can observe next time! 
>
> 
>
> 
>
>Cheers, 
>
> 
>
>Brian
>
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