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A hand in hand clock is a clock where the minute hand is mounted on the tip of the hour hand (and second on minute). This gives a clock that looks quirky and unique, but still very readable and clock like.

This clock is a skeleton edition of a hand in hand clock. This means that all gears of the clock are visible. The idea behind skeleton clocks is not to hide how it works by covering it up, but to show it off. While this is not something everything likes, it is something that I as an engineer really appreciate. For the color scheme of this clock I wanted something almost like steampunk. This left only one possible color scheme. Black and glorious gold, with brass screws. I think the result is really stunning.

Step 1: The design

After having finished the original Hand in Hand Clock, I had some people suggesting I made a skeleton clock version of the hand in hand clock. I really liked this idea. The type of clock really lends itself to a skeleton version, and I am an engineer, I don't need minimalist clocks, I want to see gears and stuff. So here we are, a Skeleton version. The mechanism is no longer hidden behind covers and frames. The mechanism is now the centerpiece of the clock.

The previous clock was made start to finish in 6 days. That is not design, that is EVERYTHING. Design was done in 2 days or about 10 hours. While it worked, it was an assembly nightmare. Some holes were unreachable, some gears had no bearings and shafts could not be properly secured without a lot of glue. This time I took the time to make a clock that can actually be assembled without glue and without getting a depression. It is easier to assemble and it runs better.

Another great improvement is that this clock uses a DC gear motor instead of a stepper motor. A stepper is easier to control, but it had a relatively big power consumption. It also produced a massive amount of noise, ticking loudly (louder than a normal clock) about every second. The DC gear motor can only be heard in a completely quiet room, and even then it only is on for about 2 seconds every few minutes. An added benefit of the DC motor is that it is a lot smaller and uses a fraction of the power. The whole clock never gets above 0.5W and has shrunk considerably in size. The DC gear motor uses a tcrt5000 optical reflex sensor and an encoder printed to one of the gears to determine the position of the motor.

<p>nice engenerring design</p>
<p>hi, can you give the source of your great looking filaments? i like the golden as well as the dark grey!! </p>
The clock was printed in PLA from a brand called Real from Reprapworld.com. The black is decent, the gold was quite hard on my printer. I have since changed to colorfabb and like how it prints so far. Simply picking black and gold from a supplier closer to you will probably yield comparable results.
Where is the best place to buy all of the bearings needed for this project?
<p>Quite a challenge... It took me weeks to gather all the hardware. The printed parts fit together well, but without the design files to modify the fit for the mechanical components it was slow going. The minute had is a bit too long for my printer, but I managed.</p><p>The electronics... Let's just say I learned a lot. Took multiple prototypes to get all the wiring working. The board I used is the digispark (<a href="http://digistump.com/products/1" rel="nofollow">http://digistump.com/products/1</a>). I had to expand the case back by ~5mm to fit the headers I used, but it was worth it for disconnecting/programming the board (which this board requires in order to use pins 3 &amp; 4. Not sure if the teensy has the same restriction.) </p><p>I need to adjust the firmware... mine counts 1 hour for about every 5... Not sure if that's an issue with the optical sensor I'm using. Occasionally it does not advance a full tick.</p><p>I nearly gave this to a friend over the holiday... I'm glad I tried one first. This is not a build for beginners.</p>
<p>Great 3D design. Gears and body worked as designed. I added an H drive and a second push button for forward and reverse setting. That and the use of a Nano required a small box further down thew cord, rather than electronics in the clock. I also made it so the clock runs from the 60Hz power line for accuracy. Small changes to a great project.</p>
<p>This is stunning. Well done.</p>
<p>Hello,</p><p>I have printed all the gears and have it all nearly finished but there appears to be one .stl file for the idler gear missing from the .zip file. There are a total of 17 .stl files. Is it possible to obtain the file for this gear? Regards</p><p>Peter</p>
<p>I checked and double checked all the files. There are indeed 17 stl files but nothing appears to be missing. The gear in question is called: &quot;HIHCS1 gearbox 1.25M 13T-27T.STL&quot;. When I downloaded the files from my site, it was there.</p>
<p>It's all going fine! I am planning two clocks as Christmas presents for my son &amp; son-in-law. I have acquired almost all the components, printed most of the parts but I struggling a bit with the electronics. I am a complete novice here. I have got a 5v Trinket Pro and am trying to understand the electronic side. Do I use the analog pins (these are marked A0 &gt;&gt; A5) or the digital pins (these are marked RX,Tx,3,4,5,6,8 but no 2)? I guess it is the former since your circuit diagram shows a #2 pin. I don't not want to fry my circuit so your advice would be appreciated. </p>
<p>The component used is not a trinket pro, it is a trinket. It is an easy mistake to make, but they are not perfectly cross compatible. The non-pro version of the trinket only has 5 pins, marked 0 to 4. </p><p> I doubt that the pro fits in the electronics compartment with all other components. If it actually does, please say so and I will see how it should work (if it can)</p>
<p>Thank you for that timely advice. I will put the Trinket Pros in the drawer and buy the proper device.... Stupid of me to get the wrong bits. Luckily the mistake was not too expensive. </p><p>I have printed all the parts in fine detail in yellow and black on an Ultimaker 2 in our local Fab-Lab. It took a long time, but they look great!</p>
<p>Nice Clock. Although the clock is said not that precise, but it can be fix on software side. Love the video most :D</p><p>You've got my vote.</p>
<p>The accuracy limit is hardware, since the encoder wheel is only 6 pulses big. You could use software to move between these pulses but I personally am fine with a clock that only does time at 2.5 minute intervals. In all reality, you cannot even read this clock to within that accuracy. There is no index behind the hands.</p>
<p>Don't want to get too blingy but, how about micro LEDs for the two hands. Invisible in the daytime but great at night. I suggest red/green together for the hour hand and blue for the minute hand. (Solidarite' Paris) Lets do what we can.</p><p><a href="http://www.newyorker.com/culture/culture-desk/cover-story-2015-01-19">http://www.newyorker.com/culture/culture-desk/cove...</a></p>
<p>Great Instructable. On the time setting problem, how about using a friction clutch where the hour/minute gear-set connects to the drive. It's how I set my grandfather clock. I just move the minute hand to the correct time and the hour hand follows. If nobody wants to try it, I'll try twisting the required parts into SketchUp to make the change. Ideas?</p>
If ever there were something on instructables that I want to make, this is it. Couple questions: Assuming I can get access to 3D printer, which I can, how much do all the other parts cost roughly? And what are the approximate dimensions of this clock? For example is it rotating around a central axis inside a circumference of maybe a small plate?<br><br>And sidenote: something that is not very well known about the Wright brothers, is that they did not just invent the airplane. They needed an engine that would provide the necessary power but would still be light enough to put on an airplane. They went to many engine manufacturers requesting the specifications they needed in an engine. But at every one they were sent away. So they built their own engine. That is, they saw that nobody else would do it for them so they did it themselves. That is what makes them my heroes. They had the attitude of &quot;I can do anything&quot;. So if someone says &quot;I can't do that because I don't have a 3D printer&quot; I don't have much sympathy for them. <br><br>Mad props to you for an amazing instructable that feeds my inner child and inner engineer at the same time. I love that clock!!!
<p>The clock occupies a circle with a diameter of 600mm. This is the maximum reach of the clock (roughly 300mm) in all directions. Bearings and motor were sourced from ebay. The 11 bearings are at most &euro;1,- each, the motor is &euro;4,-. The Trinket is &euro;7.5,- and because I used brass screws, nut and bots, those were &euro;15,-. </p><p>Please be more constructive when it comes to 3D printing and instructables, this is a discussion because there is more than one side to it. </p>
You are very right. I apologize. What i said was out of order. And thank you for reminding me to be courteous. <br><br>
<p>I am enjoying your write-up! Unfortunately you have a broken link in the text under Step 1 -- it's supposed to be pointing to &quot;the original Hand in Hand Clock&quot; which I presume is at https://www.instructables.com/id/Hand-in-hand-clock/</p>
<p>Thanks for notifying me, it is fixed now.</p>
<p>Oh for the days when Instructables had things common folk could hope to make. Nowadays I seem to find cool postings only to see it requires a $50,000 CNC machine or if I am lucky a $10,000 3D Printer.</p><p>Perhaps someone can find a way to expose the resources required for these cool projects so people can access the needed parts.</p>
<p>While I somewhat agree, I think a bit of perspective is healthy here. Yes, this thing uses a 3D printer that costs $700, yes, even cheap ones go for $400, but it allows for so much more possibility than buying stuff or making literally everything by hand.</p><p>Lets take this very clock as an example. Simply buying all required gears (if you can already find them) would cost about as much as buying a cheap 3D printer. Making the frame out of stuff like wood would take weeks of work. Some projects have become more complicated, but access to 3D printers allow for this. </p><p>There is still plenty on instructables that 'common' people can make, but going to a complicated 3D printed clock and complaining that it requires (ONLY) a 3D printer seems a bit shallow if the better alternatives to make it don't really exist.</p>
<p>I disagree with you on &quot;alternatives to make it don't really exist&quot;. You say making this out of wood would take weeks, but in reality most people could make the parts in a day or two. Even the gears could be made with a scroll saw by hand. It's this attitude that is killing instructables, not 3D printing technology. So many claim things aren't possible or are too difficult other ways, when people like myself ad others look at difficult projects as fun, challenging activities. So many look for instant gratification instead of putting in a little time to make something they can be proud of.</p>
<p>But 3D printing does not take skill out of the picture, it places it somewhere else (at least for the designer). Also with some of my other projects, 3D printing was the simplest step of the process and I still need considerable skill to design, paint and assemble (Laser Rifle for instance). How much of a challenge it is for others has little to do with me. Replicating from an instructable is always going to be easier than making the original. How much simpler depends on the project and the poster.</p><p>It is not that I disagree with the make it by hand mentality, but some people enjoy designing stuff for 3D printing. But if you really insist, would people be interested in a cut out of thin plywood by hand version of this clock. I currently have no other projects than the hand in hand clock to offer in a hand made version, but I can do that eventually.</p><p>Also, PEOPLE!: Can we move this discussion to a forum topic instead of in the comment section of a clock. I do think this is a topic worth discussing and it takes the discussion away from where it shouldn't be, here.</p>
<p>There are many online companies that have thousand dollar 3d printers that will print objects for you if you send them the properly formated 3d File, i.e. files that they will use.</p>
<p>I find such Instructables interesting to read and inspirational to behold.</p><p>Great Instructable! Thanks for sharing.</p>
I agree with your general sentiment. There are however things that are way cool if you *do* have access to the right tools. Instructables is a fine place to show these accomplishments to other people, so that those who are really interested can go make the thing. Instructables is a great place and I like that this author figured out how to *fix* the issue with his last version (loud ticking) and still introduce a new concept... Steampunk. Keep up the good work Dragonator!
<p>On the one hand, I agree that this is a very good and interesting design, yet I too feel that we should also look for other more simple ways to construct the same thing. Certainly for clockwork devices, a basic approach should be feasible as gear wheels have been hand made for over two thousand years.</p><p>Perhaps some intrepid person would like to have a go at this using only hand tools. For inspiration, I link to Michael Wright making a gear wheel from brass using only hammer, chisel, and file. See </p><p>I would like to say that I think 3D printing is a truly remarkable development, and we should always be looking for ways to maximise its benefit, yet at the same time we should seek to preserve our most basic skills.</p><p>Oh nearly forgot, I must thank <a href="https://www.instructables.com/member/dragonator/" rel="nofollow">dragonator </a>for such a wonderfully finished and presented piece of work.</p>
<p>Check www.3dhubs.com for a 3D printer near you. Even though you may not have one someone will have one near by and can help you print the parts.</p>
<p>A beautiful job, thanks for sharing, which seem these other, Greetings</p>
<p>cool! i'm voting for you</p>
<p>Brilliant design. I am printing the parts as I write this.</p>
<p>It looks great!!.. just a question. Which software did you use to create the model? Where you able to run &quot;simulations&quot; with it?<br><br>I always have trouble trying to create gears and stuff and trying while designing</p>
<p>Solidworks, but I do not form the gears myself, they are generated by a toolbox.</p>
<p>Nice! I love the steampunk touch! Problem is I can't 3d Print around here. Would fabricating the parts in steel help? I'm new at this so I don't know how the power requirements would change either :/</p>
<p>For the effort required to make this in steel (or aluminium) you could make a 3D printer and print it. Gears suck to make with conventional machining. Don't let that stop you though, it is possible and it would be infinitely more awesome that way. mass is not really the problem for the motors, drag on the parts is. I think it should do fine if it is made well. </p><p>If you are serious I can publish STEP files so the parts can be machined.</p>
<p>I designed a very different clock using a stepper motor. I found this driver (</p><p>http://www.watterott.com/en/SilentStepStick) that allowed completely silent operation of the stepper. Maybe you can incorporate it into your first design.</p><p>You hand-in-hand clock is inspirational!</p><p>C</p>
<p>The stepper would have to be powered continuously to achieve the silent operation (I did that myself as well first) but that way the clock consumes watts of power. I refuse to have a clock using 5W+ of electricity when it can be way less. </p><p>The solution was to turn microstepping off and only enable the stepper driver when a step needed to be made, but even that was no good solution. While the power was below 1W, the clock made a lot of noise. In the end, I used a DC motor, seen here. </p><p>I like this solution better. I will probably redesign the previous clock to also use DC.</p>
<p>Awesome idea. This is extremely creative and is added to my long list of projects to complete.</p>
<p>Awesome, love the idea, and the effort.</p>

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