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# Stupid Rolling Coffee Ball Thing

Grind beans, stick it in a ball that rolls on top of a column of boiling water.
 (+5) [vote for, against]

You put the coffee in this ball with angled holes in it. When a column of boiling water is pumped upwards from the coffee fountain thing it balances and rolls while the boiling water shoots into the ball, steeps into the coffee and drains out with coffee bean juice.

This would accomplish the following:

1- A ball rolling on top of a column of boiling water. 2- Coffee.

 — doctorremulac3, Sep 21 2017

[link]

NOTE: The column of water would be 3 or 4 columns adjusted to balance the ball on the top, you get what I mean.
 — doctorremulac3, Sep 21 2017

This would be a "ping-pong ball on water jet" thing, then ?
 — 8th of 7, Sep 21 2017

Yyyyyyyeeeeeeeesss. Exactly. But with coffee. And the water's boiling.
 — doctorremulac3, Sep 21 2017

//The column of water would be 3 or 4 columns // So, like [19]'s scrabble board, then?
 — pertinax, Sep 22 2017

Hey it just occurred to me there may be a utilitarian reason for this. You could glance across the room and see the color of the column of water. If it's dark, the coffee's done.
 — doctorremulac3, Sep 22 2017

 If the water is actually at 100C, then the column will be discontinuous and won't effectively support the sphere because of bubbles formed as it boils.

 Your water jet needs to be at 99.9°C.

Good luck with the health and safety assessment ...
 — 8th of 7, Sep 22 2017

 I think you could get enough force from the pump to compensate for any lack of lift due to any bubbles. The force lifting the ball is the pump via the water stream so even if it was pure air you'd still get the lift you needed if you cranked the pump enough. In other words, it's not floating atop that column, it's being thrown into the air.

And yes, it would be somewhat more dangerous than the standard coffee maker which is certainly a good thing. Mornings should be a little dangerous.
 — doctorremulac3, Sep 22 2017

Mornings without coffee if it doesn't work are definitely dangerous.
 — RayfordSteele, Sep 22 2017

The water needs to be considerably below 100 C because the best coffee is made at a lower temperature due to the solubility of different substances in it at different temperatures. I've heard 86, but that sounds a bit low.
 — nineteenthly, Sep 23 2017

 The jet is going to shed thermal energy very quickly, so the water striking the ball certainly won't be at 99C if the column is of any height.

 A larger diameter, lower-pressure column where the ball is only lifted a short distance might be better.

If 86C is the ideal temperature for coffee, then why Espresso ? That uses steam.
 — 8th of 7, Sep 23 2017

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