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Show HN: I spent a year making an electro-mechanical prototype of a liquid clock

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Re: Show HN: I spent a year making an electro-mechanical prototype of a liquid clock

#21
post #6

Beautiful object! What was an unexpected problem you had? And how do you solve it? There's a bunch of mechanical stuff going on. How much training did you have in that before you started? What one thing will you remember for your next project?

META - are you thinking about hiring the OP? These look exactly like some of my favorite questions when I interview candidates :D

Re: Show HN: I spent a year making an electro-mechanical prototype of a liquid clock

#27
post #6

Beautiful object! What was an unexpected problem you had? And how do you solve it? There's a bunch of mechanical stuff going on. How much training did you have in that before you started? What one thing will you remember for your next project?

Hi DanBc, Thanks a lot! Wow... were to start.. Perhaps the biggest problem i had was preventing the ferrofluid to stain glass and aluminum frame i used for the screen. I tried to get some help on the faculty of chemistry here in Belgrade, but no real success. Finally after months and months of experimenting with different liquids, you start to feel and "undertand" the way ferrofluid behaves.. very strange :) Its stil…

It's interesting to see that you're physically moving the magnets towards and away from the ferrofluid. Did you investigate electrically switchable permanent magnets?

e.g.: http://www.eclipsemagnetics.com/media/wysiwyg/datasheets/lif...

I know very little about them, other than that they're cool. The ones in that datasheet start about at about 2kg, so I don't know if you can get them small enough for your purposes.

Re: Show HN: I spent a year making an electro-mechanical prototype of a liquid clock

#28

Earlier quoted context omitted.

Does your clock require frequent refilling?

Hi Henk, At the moment its working but its not perfect. The biggest challenge i had was to make this really look like fluid and kill the ferrofluid spikes. I simply wanted to animate the fluid not make it obvious that its a ferrofluid. So i had to thin the ferrofluid with all kinds of different things, some work better some work worse, still testing.

I was wondering about the spikes. What did you do that worked / didn't work to fix that?

What is the 'thickness'? I'm guessing only several millimeters??

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