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Harmonograph

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Project by dartzt posted 05-20-2013 10:30 AM 2662 views 9 times favorited 23 comments Add to Favorites Watch

This was a project that took a long time to work out the kinks. I would work on it for some time , get frustrated and put it in storage . Later, pull it out, dust it off and “chip away” at it! After about two years of on and off working on it. It finally looks and works like I wanted it to!

-- Darren A. - Bosque County, Texas "Nothing great was ever achieved without enthusiasm" - Ralph Waldo Emerson





23 comments so far

View thelt's profile

thelt

620 posts in 2032 days


#1 posted 05-20-2013 10:51 AM

Please explain what it does. Looks like a lot of trail and error in building.

-- When asked what I did to make life worthwhile in my lifetime....I can respond with a great deal of pride and satisfaction, "I served a career in the United States Navy."

View ldl's profile

ldl

1135 posts in 1018 days


#2 posted 05-20-2013 11:13 AM

Amen Thelt can’t see a use for it. Looks like it draws a pattern similar to the old spirograph. Probably got a good use for Dartzt to spend that much time on it though.

Looked it up and here is a youtube video only this one has 3 arms instead of two. Actually very neat and a good job by Dartzt. Interesting I was kinda right in my assessment of it and didn’t know it.

http://www.youtube.com/watch?v=oFfMEm6u0yE

-- Dewayne in Bainbridge, Ga. - - No one can make you mad. Only you decide when you get mad - -

View JoeinGa's profile

JoeinGa

3239 posts in 660 days


#3 posted 05-20-2013 11:29 AM

Yep. my first thought too was “Looks neat. Now what the hell is it?” :-)

Even after watching the vid Dewayne posted I’m still curious. Is it motor-driven? Or perpetual motion? (The one in the vid never seems to stop or even slow down)

And other than to draw Spirograph pictures, what’s the intended purpose of it?

-- Perform A Random Act Of Kindness Today ... Pay It Forward

View dartzt's profile

dartzt

54 posts in 734 days


#4 posted 05-20-2013 01:38 PM

It’s a pendulum drawing machine. It really has no practical use as far as I know. From what I have read about these things its from the 19th century and was first used to “draw harmony”..... Later they were more of a conversation piece. There are many types out there, mostly at science fairs and museums. I chose a 2 axes, gimbal mounted pendulum based type. The weights are just disks from the sporting goods store painted copper. The gimbals are wood and 1/4” carriage bolts sharpened to a point, painted copper and resting on 4 penny’s and 4 nickel’s sanded flat. The shafts are oak dowels threaded so it can be broken down. The two main problems I had were 1) making the gimbals out of wood and 2) getting the pen arm balanced to the point where the two separate axes would not synchronize with each other.

“Why the heck would I build something like this?”..... I honestly don’t know…. It was a fun project though.

https://s3.amazonaws.com/lumberjocks.com/mn3n3ia.jpg!

-- Darren A. - Bosque County, Texas "Nothing great was ever achieved without enthusiasm" - Ralph Waldo Emerson

View dartzt's profile

dartzt

54 posts in 734 days


#5 posted 05-20-2013 01:40 PM

-- Darren A. - Bosque County, Texas "Nothing great was ever achieved without enthusiasm" - Ralph Waldo Emerson

View ChrisK's profile

ChrisK

1144 posts in 1734 days


#6 posted 05-20-2013 01:43 PM

Way cool, my kids would love to have one of these. No practical purpose is usually all I need for an excuse.

-- Chris K

View stefang's profile

stefang

13024 posts in 1987 days


#7 posted 05-20-2013 01:51 PM

It certainly makes some interesting drawings. Can a drawing be preplanned, or do you just get random results? I think this is a wonderful project. We should do more stuff just for fun. That’s enough of a purpose in my opinion.

-- Mike, an American living in Norway.

View helluvawreck's profile

helluvawreck

15782 posts in 1519 days


#8 posted 05-20-2013 01:56 PM

That is a real interesting device. The drawings to me are interesting in their own right and would look good just mounted in a frame. It’s a nice project and seems well made. Congratulations.

helluvawreck aka Charles
http://woodworkingexpo.wordpress.com

-- If a man does not keep pace with his companions, perhaps it is because he hears a different drummer. Let him step to the music which he hears, however measured or far away. Henry David Thoreau

View dartzt's profile

dartzt

54 posts in 734 days


#9 posted 05-20-2013 02:03 PM

Here is a YouTube video of it.

http://youtu.be/583yqYbiXJI

0%

-- Darren A. - Bosque County, Texas "Nothing great was ever achieved without enthusiasm" - Ralph Waldo Emerson

View dartzt's profile

dartzt

54 posts in 734 days


#10 posted 05-20-2013 02:04 PM

So far I have not been able to preplan a drawing and interestingly I haven’t been able to duplicate one either??

-- Darren A. - Bosque County, Texas "Nothing great was ever achieved without enthusiasm" - Ralph Waldo Emerson

View Pimzedd's profile

Pimzedd

450 posts in 2457 days


#11 posted 05-20-2013 02:20 PM

How do you start a drawing?

-- Bill - Mesquite, TX --- "Everything with a power cord eventually winds up in the trash.” John Sarge , timber framer and blacksmith instructor at Tillers International school

View dartzt's profile

dartzt

54 posts in 734 days


#12 posted 05-20-2013 03:07 PM

The pen arm is hinged. With the pen arm in the up position you get the two pendulums moving in whatever directions you like and then while the two are moving you lower the pen arm contacting the paper. When it all slows down to almost a stop you raise the pen off the paper. The “handle” end of the pen arm has a weight that can move in and out depending on the weight of your pen. The pen clamp adjusts to fit most pens and pencils. I used thumb screws and threaded inserts on the pen clamp and the pen arm weight. The pen arm hinged block has an exaggerated V cut so as to allow the pen to follow the paper’s surface up and down.

-- Darren A. - Bosque County, Texas "Nothing great was ever achieved without enthusiasm" - Ralph Waldo Emerson

View shipwright's profile

shipwright

4965 posts in 1451 days


#13 posted 05-20-2013 05:13 PM

What a lot of fun.
It could keep me occupied for many hours.
Great work and perseverance to accomplish this one. It was worth the effort.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fiberglass trees. http://prmdesigns.com/

View Gary's profile

Gary

1026 posts in 2977 days


#14 posted 05-20-2013 08:24 PM

Cool; I have a nephew who would probably like one of those.
<—-> plans on the short list. ;-)

-- Gary, Florida. http://www.penturners.org/forum/f70/servicepens-2014-a-111967/

View oldnovice's profile

oldnovice

3760 posts in 2021 days


#15 posted 05-20-2013 11:17 PM

Beautiful work and I love the concept of having harmonics create a drawing. I suppose one could get hypnotized watching one of these!

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

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