The Starter clock No. 47 has been designed and built in inches and like its predecessor, now has a second version that is a bit more challenging, but still not requiring the use of a lathe or the more complex parts in some of the other clocks found here. It is therefore a logical progression for the builder who has finished the Starter clock and wants to move on to something more demanding.
The original Graham Escapement has been replaced with a Grasshopper type which is more complex to make but has a much more elegant action as can be seen in the accompanying video.
For the first time on any of my clocks I have incorporated a Daisy Wheel Motion to drive the Hour hand. This mechanism was originally designed by Clockmaker Aaron Dodd Crane around 1830 and is incorporated here in a slightly modified form to show off the Daisy Motion more clearly. One of the nice features of this design other than its novelty is that the Hour and Minute hands are directly connected so that turning the Minute hand also adjusts the Hour hand in the correct ratio of 12:1.
The prototype runs for 20 hours and has been running for around a month now and is keeping good time to within 2 minutes in a 20-hour period. The clock is less accurate than the original because of way in which the impulse is applied to the pendulum, but the smooth nature of this more than compensates.
DXF files, and the IGS-STP and STL files that can be used with your CNC machine and 3D printer can be downloaded here for $26. You also get the unrestricted version of the PDF files that can be printed at full size and in this clock only the STL files if you need them.
Drawings for this clock in PDF format can be downloaded here. These free files are low resolution and not to scale and only a sample of the full set that comes in the paid for version. Clicking here will download the PDF file directly to your browser, may take a few moments so please be patient.
Instructions for assembling the clock components.
A sample from the DXF file – the file is purposely low resolution, with no vector data. The actual files purchased above are included on one large sheet so that they may be directly loaded into your CAM program.
To print only a single item of the drawing to scale using Adobe Acrobat Reader, do the following:
Go to Edit, then click on Take a snapshot, move the cursor to the top left of the item you want to print and hold down the left mouse button whilst you drag a box around the item. The inside of the box turns blue and you can now go to File and then click on Print. This brings up the print dialogue, make sure Selected graphic is selected and that the Page scaling is set to None and the click on OK. As long as your printer is connected you will have printed the item at size. Do this for each item you want to cut out.