LumberJocks

I need help with a clock!

  • Advertise with us

« back to Designing Woodworking Projects forum

Forum topic by johnhutchinson posted 01-14-2014 12:48 AM 854 views 0 times favorited 24 replies Add to Favorites Watch
View johnhutchinson's profile

johnhutchinson

1193 posts in 1090 days


01-14-2014 12:48 AM

Topic tags/keywords: clock question resource

Because my woodworking “empire” has had a lot to do with frogs, I want to add a frog clock to my line.

The hour and minute eyes are easy because I can use a pair of cheap battery clock drives, but the rocking legs have me stumped. Maybe I should buy a wagging-tail cat clock, tear it apart, and see how that works?
There must be some mechanical engineer out there who can say, “Do this, and you’ll be set.”

“Just get a Timex” is not an acceptable option. :)

I made a promotional video and tossed in a crab just for kicks. https://vimeo.com/54744392

-- John - Central Ohio - "too much is never enough"


24 replies so far

View DIYaholic's profile

DIYaholic

19172 posts in 2135 days


#1 posted 01-14-2014 12:54 AM

Klockit has quartz movements with pendulums.

-- Randy-- I may not be good...but I am slow! If good things come to those who wait.... Why is procrastination a bad thing?

View longgone's profile

longgone

5688 posts in 2769 days


#2 posted 01-14-2014 01:09 AM

Cajun Swamp Frog

View johnhutchinson's profile

johnhutchinson

1193 posts in 1090 days


#3 posted 01-14-2014 01:31 AM

Randy—Thanks for the Klockit suggestion, but I asked them and they didn’t think a pendulum mechanism would work. My automata buddy Dug North said to forget clockworks (although it’s a clock) and think about a motor with a cam to alternately displace the legs.

Greg—Remind me to wear heavy boots when I visit. :)

-- John - Central Ohio - "too much is never enough"

View Doe's profile (online now)

Doe

1308 posts in 2290 days


#4 posted 01-14-2014 01:33 AM

Klockit has interesting pendulum kits

Woodcraft has this

I’m excited to see what you come up with. The Cajun swamp frog will give me nightmares.

-- Mother Nature talks, I try to listen

View dawsonbob's profile

dawsonbob

1910 posts in 1216 days


#5 posted 01-14-2014 01:48 AM

Hey, John, a pendulum movement might actually work, assuming that the pendulum is only there for aesthetic purposes, but the movement provides force to swing the pendulum. One might be able to cut off all but an inch or so (depending on the size of your happy little froggy), then insert a pin that would actuate the legs. Let me know if you need a sketch to illustrate what I’m talking about.

-- Mistakes are what pave the road to perfection

View johnhutchinson's profile

johnhutchinson

1193 posts in 1090 days


#6 posted 01-14-2014 02:00 AM

Doe—The double-action pendulum on the Klockit website was designed by the guy I talked to. He’s the one who said it wouldn’t work for my application.

dawsonbob—I think your “pin” idea is on the right track. I came up with something I think would work, but I wrote it off as way too complicated.
Check this out … https://vimeo.com/50307734

Now that I’m looking at it again, I’m thinking that a simple cam could replace the whole mess.

-- John - Central Ohio - "too much is never enough"

View oldnovice's profile

oldnovice

5721 posts in 2828 days


#7 posted 01-14-2014 02:01 AM

Get a timer motor, AC synchronous and typically geared 1 RPM, cut some wooden gears for the eye movement connected to an escapement to the legs.

-- "I never met a board I didn't like!"

View JustJoe's profile

JustJoe

1554 posts in 1499 days


#8 posted 01-14-2014 02:05 AM

You might try tracking down some whirligig plans/books and studying how they make arms and things move.

-- This Ad Space For Sale! Your Ad Here! Reach a targeted audience! Affordable Rates, easy financing! Contact an ad represenative today at JustJoe's Advertising Consortium.

View dawsonbob's profile

dawsonbob

1910 posts in 1216 days


#9 posted 01-14-2014 02:10 AM

Hey John, While I like your application of the Scotch Yoke, I think the mechanism is a little more complicated than necessary. A cam action COULD do the job. If it were me, though — which it’s not — I think I would cut off the lower part of the pendulum and epoxy in a pin that rides in a corresponding slot in the frog’s legs. The two legs would have to be one piece on a pivot. An old prof at an engineering school I drove past once would have called it an elegant solution.

-- Mistakes are what pave the road to perfection

View johnhutchinson's profile

johnhutchinson

1193 posts in 1090 days


#10 posted 01-14-2014 02:12 AM

Thanks, oldnovice.
I purchased a 120V AC, 2.5 rpm, continuous-duty, timer motor for another project, and I’ll probably move it to the frog clock. I’ve cut a lot of wooden gears in the past, but I’ve always had problems with really small gears. I might be better off just buying some nylon gears.
I do want to use 1/8” Baltic birch plywood for the frog body and legs.

-- John - Central Ohio - "too much is never enough"

View johnhutchinson's profile

johnhutchinson

1193 posts in 1090 days


#11 posted 01-14-2014 02:22 AM

dawnbob—I really appreciate your pin-in-slot suggestion, but I’m thinking that I need two pivot points rather than one. What you’re suggestion would probably be more applicable to a Popeye-The-Sailor-Man clock where the arms and legs swing back and forth on a single center pivot.

That’s why I’m now thinking a cam that alternately displaces two legs on two pivot points.

Hmm. I’m starting to like the Popeye idea. :)

-- John - Central Ohio - "too much is never enough"

View dawsonbob's profile

dawsonbob

1910 posts in 1216 days


#12 posted 01-14-2014 02:26 AM

Well, Popeye’s okay, but Olive Oyle, now that there’s sumpin to work with.

-- Mistakes are what pave the road to perfection

View johnhutchinson's profile

johnhutchinson

1193 posts in 1090 days


#13 posted 01-14-2014 02:41 AM

I’m not sure what Olive would do, but I think a swinging-arm Popeye clock would be vey cool!

Oops. Is this where I’m supposed to say … ” But I digress.” :)

-- John - Central Ohio - "too much is never enough"

View dawsonbob's profile

dawsonbob

1910 posts in 1216 days


#14 posted 01-14-2014 02:46 AM

I’m not sure what Olive would do, either, but I’ve always liked her for some reason. Kinda scrawny, though.

-- Mistakes are what pave the road to perfection

View johnhutchinson's profile

johnhutchinson

1193 posts in 1090 days


#15 posted 01-14-2014 02:56 AM

Maybe it was something about her voice. Did you find it soothing?

-- John - Central Ohio - "too much is never enough"

showing 1 through 15 of 24 replies

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com