Wood Gear Clock

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Wood Gear Clock

Postby rawkstar320 » Thu Feb 14, 2013 9:54 pm

I have always found wooden gear clocks fascinating, and now that I have a CNC machine, I can make one! Well, actually most people cut the gears tooth by tooth with a scroll saw, but I am much less patient than those people. All of the gears for this particular design fit onto my Zen 7x7 bed, pretty much taking up every last bit of room at times...which is slightly unnerving knowing that you are literally millimeters from a crash.

Anyways, the design is Brian Law's "Clock 2" found here: http://www.woodenclocks.co.uk/clock2.html

Most of the clock designs are free PDF plans, but the DXF files cost a little extra. I went ahead and paid for them because I really didnt want to convert PDF to DXF, and just wanted to start cutting. Once this clock is finished, I plan on designing a new clock more suited for CNC milling. Ive attached a few pictures, but will add more as I make progress.

Using 1/4" Oak plywood (it looks nice and is cheap) I cut several 6x6 blanks. After determining the EXACT excents of my machine, I found the dead center of my workspace and drilled a small hole. I found the center of my 6x6 blank and centered that directly at the center of my workspace before adding the hold down screws. After that, it was easy to just plop in a new blank and hit "Go!" to make all the gears!
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Re: Wood Gear Clock

Postby Arnell » Fri Feb 15, 2013 8:34 am

Nice project. I hope you will give us a blow by blow account as you work on it. How often will the clock need to wound?
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Re: Wood Gear Clock

Postby rawkstar320 » Fri Feb 15, 2013 10:07 am

Thanks! I think it will need to be wound a few times a day, but this is really focused on an excersize in building a clock.
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Interested in making your own machinable wax? Check out: http://www.instructables.com/id/Machinable-Wax/
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Re: Wood Gear Clock

Postby myklhn » Fri Feb 15, 2013 12:40 pm

How long did it take to make all the parts? How about just the largest gear?
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Re: Wood Gear Clock

Postby rawkstar320 » Fri Feb 15, 2013 4:05 pm

Too long... I have a standard 7x7 and I dont recall exactly how long it took. probably 10-15minutes for the large guys? I usually lose track due to set up time, restarting the program, and other oddities.

It was also very loud, I really hate using my dremel, simply due to the noise factor (I also hate using my router table for the same reason...). So an enclosure is deffinitely on my to-build list.
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Re: Wood Gear Clock

Postby Hawk » Fri Feb 15, 2013 5:46 pm

Looking good rawkstar........

I just finished up on another modified Clock 6..

Image

Gears were cut from Cherry, Maple, and Walnut.....

Image

And this is my Clock 1...with some additions.....

Image

They are a lot of fun to do...but a real pain in the rear end to get running reliably..... :evil:

WIned time on the wall clock is about 12 hours. The Standup gets about 10 hours on a wined. They both take about 12lbs of weight on a doubled drop.

I have done 4 of them now, and about burned out on clocks for a bit I think..... :lol:
But plan on one more this summer....

Ken
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Re: Wood Gear Clock

Postby jscook55 » Thu Feb 21, 2013 5:40 pm

Wow, really nice clocks! I've been working on one myself, but now that I'm getting close, I'm starting to realize the devil is in the details...
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Re: Wood Gear Clock

Postby rawkstar320 » Fri Feb 22, 2013 8:35 am

Yes it is. I learned alot from cutting the gears (being engineer, i made a few assumptions...). So I decided to start over, and design my own from scratch. I found a killer spreadsheet that explains and calculates the pendulum and escapement - from there its "just" gears.

So this project may be delayed significantly, but I will try to keep posting updates.
Check out my Etsy store: http://www.etsy.com/shop/WondrousWidgets

Interested in making your own machinable wax? Check out: http://www.instructables.com/id/Machinable-Wax/
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Re: Wood Gear Clock

Postby Sparky » Fri Feb 22, 2013 10:47 pm

A few months ago I built David Atkinson's Primus http://www.woodentimes.com It runs 3 days on one winding and keeps very accurate time except on those rare days of extra high humidity when it slows a bit. I believe this is due to the long, raw wood pendulum which I'll tweak when I take it down to stain the frame. The largest gear is about 9" in diameter so at least a 12x12 CNC router is required. Gears are birch plywood and the frame is solid red oak. Hands are 1/4" walnut. The weight shell is PVC pipe with oak end caps. Since lead shot was difficult to find locally, it's filled with about 7 lbs of steel BBs which I found on sale at a big box sporting goods store. I agree with Hawk about the frustration of overcoming friction. I learned a lot, enjoyed the project, and also discovered how important it is to keep the end caps securely attached. This is clock number 4 for me and I'll build David's Septimus with smaller gears next.
Primus2012.jpg
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