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mototed
08-24-2010, 06:53 PM
Never posted a video before, maybe this will work. With all your guys help, I was able to make this possible. Remember the posts about bending AL and routing? Well it worked out really nice.
http://vid217.photobucket.com/albums/cc28/mototed/th_Harmonagraph.jpg (http://s217.photobucket.com/albums/cc28/mototed/?action=view&current=Harmonagraph.mp4)

jungle_geo
08-24-2010, 07:10 PM
That is a really unique and creative gift.
I would like to see more details of the gimbal style joint you created too.
Is this an original design based on the harmonagraph?

Thanks for the video!

loose nut
08-24-2010, 07:22 PM
Ah! the old harmonagraph,

mototed
08-24-2010, 07:30 PM
The gimbals are rings of stainless steel with small dimples opposite of each other,made with a ball end mill. The pivots is two .25" brass pins with tapered and balled ends that fit the dimple ( well as close as i could get them:) )I tried to use all brass, stainless, and aluminum for maintenance free purposes, but had to make the counter weights out of steel. Needed more weight, I'll probably clear coat the weights before they rust.

mototed
08-24-2010, 07:37 PM
The wife was in the man cave with me, and as long as some of the parts where separated and the whole unit was not assembled, she didn't have a clue as to what it was. This went on for 3 months!
1850's technology, Shine on.

ieezitin
08-24-2010, 08:52 PM
Great job sir.


I would like to see a picture of the drawed picture if you have time.



All the best. Anthony.

Tony Ennis
08-24-2010, 08:59 PM
That's very nice! Perhaps lead weight inside an aluminum case?

alanganes
08-24-2010, 09:25 PM
Nice work!

I have thought about building one of those many times. Is that your own design?

hoof
08-24-2010, 09:35 PM
Thats one of the more amazing things I've seen in a while, Thanks alot for sharing.

Ray

Todd Tolhurst
08-24-2010, 09:36 PM
As we say in Maine: Wicked!

Lew Hartswick
08-24-2010, 09:47 PM
I give up. What does it do?
...lew...

Mcgyver
08-24-2010, 11:16 PM
very nice, a harmonograph is someting i'd like to make. Your design? How did you figure the various distances from the gimbals?

RKW
08-24-2010, 11:42 PM
Any wife who would accept a gift like that for an anniversary is worth keeping!

Nice work!

Arcane
08-24-2010, 11:58 PM
I give up. What does it do?
...lew...

It does this (http://www.sciencemuseum.org.uk/images/I031/10302608.aspx) and can draw out images like this http://www.instructables.com/image/FFE482PF6B7SUBA/A-simple-Harmonograph.jpg

mototed
08-25-2010, 07:17 PM
For everyone that asked,
Saw a picture of one and had the chipmunks running through the head on how to build one.
I came up with a 24"x 18" oval table
Centers of pendulums- 18"
Top of table - 35 1/2"
Pendulums shaft length - 42"
The drawing platform was made to fit standard 8x10" paper cut in half (4 1/2" x 5 1/2") It has to be really smooth, I used some Luanne wood with 10 coats of polyurethane epoxied to aluminum sheet.
The weights. Well that was all trial and error. Important to keep friction on the drawing pen to a minimum. The pen has a screwed on balance weight so it can be adjusted for contact on the paper. You also need some smooth artist paper and very fine pens for best results.

kyfho
08-25-2010, 10:19 PM
Sweet.:p

At first I thought the rods underneath were gear driven - kind of an odd take on the old Spirograph®.

I love how the counterweights give it a constantly phase-shifting & decaying effect.