In case you are interested duplicating my electronics, save the file PCBs.tmp to tour download folder.
The back bone of the clock consists of a wall plate and a back frame. right analysis by La Hire. I have an interest in gears. These scans came from pictures about the size of a postage The little motor has quite some slop in its internal gear. Gear ratios are chosen to convert the time counted by the escape wheel into will produce more even wear on the teeth over the lifetime of the clock. escapement design that failed. Some designers added some 'smarts' to the driving electronics by sensing the position or swing speed of the pendulum and then adjust the pulse length (strength) accordingly. However, I decided to add a OLED display for the date and time. A second PCB holds the RTC clock, the coil driver and a bunch of female terminals serving as distribution points for the power and signals. Four bolts, washers and nuts, enclosed by cosmetic sleeves are used to stand off the back frame form the wall plate. Cool project! Three knurled nuts hold it in place. While not necessary to drive the clock, a small OLED display (Diymall 0/96" I2C 126 x 64 OLED Display) shows the date and time. I have designed probably hundreds of PCBs some with as many as 1,600 parts. Let's start with the ratchet wheel. Unfortunately, the new sketch folder will no also be in your download folder. Involute Spur Gears is a free gear designing software for Windows. The teeth are shaped as involutes which is the preferred way to design gears. DesignCAD or others? Finally, the second hand can be stopped temporarily by by inhibiting the pendulum from swinging. A number of push buttons on the control box can be used to adjust the RTC clock when it eventually drifts off, supposedly at a rate of less than a minute per year. In addition it let you compose full gear layouts with connetcted gears to design multiple gears system with control of the input/output ratio and rotation speed. We need to pulse the driving coil exactly twice a second. With the lowest prices online, cheap shipping rates and local collection options, you can make an even bigger saving. Wheel Escapement animation page. The imported DXF file describes all shapes as a huge number of small line segments not suitable to generate smooth toolpaths. This was also an experiment in rapid model design that turned out to be not so rapid. In essence, two circles of different diameter are blended together.
A mini lathe came in handy to machine aluminum shaft hubs and spacers.
Their dimensions should be obvious as the gear train is built. Most parts were machined with a CNC router. However, the electronics does not know the hand positions. To align the hands, one has to do it manually. An entire book has been written I found that the escapement action was a bit noisy as the steel pins fall into the teeth. Again, the file name will contain a bunch of letters.
This the result when fully assembled.
What is left to do is the design and implementation of the electronics. One can manually turn the minute hand clockwise which is allowed by the clutch. thanks. After the escapement wheel and the idler 1 wheel was assembled and tested, the idler 2 wheel with its clutch and the idler 3 wheel were added. Below, the 9:78 and 13:90 gear train produces a 60:1 ratio.
Open the sketch (ino) file with Windows WordPad (not Notepad).
A high-precision crystal clock (ChronoDot) is used for time keeping. Both the pendulum swing and the train of pulses are "dumb" meaning there is no correspondence between the two. This is somewhat tricky and requires patience. The axial position of this wheel on all other gear components is controlled by various spacers machined from aluminum.
The back frame is the main carrier for the hand shafts, the gear shafts and the cowls. Philippe
See next step for details on how ball bearings are used. The following picture If you have any questions or comments, please feel free to contact the author at firstname.lastname@example.org. There are several gear wheels that sit on stationary shafts. Here, we just show how the various power and logic blocks are arranged. Both projects were completed prior to a major computer crash including two sets of backups. The windows formed by the spokes of the larger wheels were cut out using tabs to maintain the integrity of the blank as most of the material was removed. However, the minute shaft could move freely on the second shaft. Start the best shopping experience you’ll ever have, right here. And, if you’re new to AliExpress, we’ll let you in on a secret. AliExpress will never be beaten on choice, quality and price. VCarve Pro was used to convert DXF files from CorelDraw into toolpaths. a toy Polaroid camera. The associated Arduino library reduces the controlling code to supplying a delay between steps and the number of steps. It looks similar to this Steampunk Style Award Statuette https://www.instructables.com/id/Make-a-Steam-Punk-Style-Cup/, I like both! The details of these parts are not shown here.
Experiments showed that selecting 45 steps per half swing and a delay between steps of 62'150 / steps = 1381 us used up just shy of one second (998 ms) which is consistent with the loop timing of 1'000 ms. ratios are not integer values. form the spokes of the largest gear are 16 tooth gears. Should the swing angle be larger, the cam roller will not move a larger distance. Then we design the back plane that holds all shafts and the cowls for the escapement.
simple component, but with many subtleties. The pinion is pushed away from its counterpart disengaging it from the idler 2 wheel. Therefore, I no linger have access to the design details. The cover of the box has two windows, one for the six push buttons.
The drawing shows the entire gear train in a linear view, together with the tooth counts. Of course, there were surprises and I made mistakes along the way. What seems obvious during the design may be puzzling if you revisit the code a year later. Most clocks the other for the OLED display. The cowl on the left prevents the escapement wheel from reversing its rotation. The design steps are organized starting with the basis mounting board that is indented to hang on a wall with a keyhole hanger.
The pendulum is mounted on the cam shaft and is centered over the driving coil.
Think how jealous you’re friends will be when you tell them you got your clock gear design on AliExpress.
So, the next pulse is applied late, slowing the pendulum down. Not directly related to the escapement. and thanks to you i'm a few steps closer again. Note that the shaft distances are identical at 3 inches. CorelDraw, on the other and can only produce 2D DXF files. This is the most current schematic of the clock. The minute hand can be turned by hand by means of a one-way clutch. The latter file was imported into VCarve Pro.
Every day you’ll find new, online-only offers, store discounts and the opportunity to save even more by collecting coupons. The idea is to repel the magnet at the tip of the pendulum every time the magnet just passed the center position. it has holes that align with the four shafts. Acrylic melts easily and I messed up several pieces along the way as the router bit clogged up with melted material. The wood fall-weight is directly connected to a spindle behind would result in a large gear size of almost 20 meters (for a metric module The cam has an interesting shape.
Originally, I was planning to use a ChronoDot clock but then ended up with a similar device (Holdding DS3231 AT24C32 I2C Real Time Clock). We hope you enjoy the new and added functions of Gearotic. the first idler wheel is already installed as the assembly progresses.
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