Subject:
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Re: LEGO grandfather clock
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Newsgroups:
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lugnet.general, lugnet.build
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Date:
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Thu, 20 Jan 2000 20:51:24 GMT
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Reply-To:
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eric@ericharshbarger.orgSPAMCAKE
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Viewed:
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942 times
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Kevin Maynes wrote:
>
> Nice piece of work. Certainly impressive given the height and functionality.
> I like the doodads up on the top too. Nice touch. One thing I wonder about is
> what it sounds like - how much of a Grandfather-Clock-Like-Sound does it make?
> Does that great cavity inside help deepen the sound at all, does it tick slowly
> or quickly, or at all.. and so on.
> Do you think you might add a chime to it someday? (Now there would be a trick
> for a purist.. Lego isn't very resonant).
> Makes me wanna rush out and buy a bunch of tubs so I can build one myself.
>
> Ok, now, so where's the DAT file for it?
>
> (Kidding!)
> (Mostly... :)
>
> K.M.
The clock does make a rhythmic tick-tock sound... actually closer to a
click-clunk sound. I thought about a strike-train/chimes... but didn't
want to go overboard [grin] -- the mechanics would be that much
trickier... plus LEGO bricks don't 'chime' at all. One interesting thing
I discovered after I moved it... to function it actually has to sit a
little off-plumb.
When I moved it to my living room and tried to start it up again, it
would not run for more than half a minute (the tick-tock-tick-tock was
also minutely off: tick-tock---tick-tock---)... finally I tilted it a
bit (the top tilts now a bit to the left as you face it)... the
tick-tock was back, and it once again seems to be running.
For those asking about the gears:
The escapement gear has 12 teeth (I would have liked more -- some
multiple of 12 preferrably -- but could not figure out another design).
anyway:
Escapement Gear --- on axle with
8 tooth gear ^^^ meshes with
40 tooth ---
8 tooth ^^^
40 tooth --- this gear disengages to allow weight windup
8 tooth ^^^
40 tooth ---
large pulley --- wheel hub (S@H pack #5283)
16 tooth ^^^
24 tooth hand/gear assembly starts
note the following calulations: the minute hand is supposed to make 1
revolution per 60 minutes.
The gear ratios provide:
(1 rev/60 min) (1 min/60 sec) (3/2) (5/1) (5/1) (5/1) == 1 rev per 19.2
secs
this means the escapement gear needs to make one revolution per 19.2
seconds... with 12 teeth... each tooth ticks or tocks every 1.6 seconds
(19.2/12)... which if you could listen to the tick-tock would be what it
sounds like.
hope that answers some questions (and doesn't pose too many new ones).
eric
ps: oh, and everyone is welcome to throw out as many Parker Posey
compliments as desired... that will only endear me to you more [grin]
--
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Eric Harshbarger / eric@ericharshbarger.org / www.ericharshbarger.org
"Oh please, if people are going to start telling the truth around
here... I'm going to bed." - Jackie-O (Parker Posey, THE HOUSE OF YES)
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Message is in Reply To:
 | | Re: LEGO grandfather clock
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| Nice piece of work. Certainly impressive given the height and functionality. I like the doodads up on the top too. Nice touch. One thing I wonder about is what it sounds like - how much of a Grandfather-Clock-Like-Sound does it make? Does that great (...) (25 years ago, 20-Jan-00, to lugnet.general, lugnet.build)
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