Using 3D Printing to Make a Clock

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If you visit the lobby of PADT’s Tempe office you will notice something very cool on the wall – a large white and black pendulum clock clicking away on the wall.  Its gears are exposed and you can not only hear it tick-toking away, but you can also see the gears moving, and watch the timing mechanism rock back and forth.  It defiantly attracts the attention of our mechanically minded customers.

imageThe clock was built by our very own manufacturing engineer Justin Baxter based upon a design from a website called Brian Law’s Wooden Clocks (www.woodenclocks.co.uk).  Brian has a large array of very cool wooden clock designs that he has done for the hobbyist community.  Do take a look at his website to see the very cool designs he has developed. He is also considering putting out wristwatch designs.

To make our clock, Justin took the Clock 1 design and modified it for use with the Stratasys FDM machines that we have in house.  Starting with the free 2D drawings on the website, he created 3D Solids of the assembly making only a few changes. He had to add a bit of thickness to the winding ratchet paul and added some brackets for rigidity because the ABS plastic is more flexible than wood.  It took about 20 hours to build up the CAD model in SolidWorks.

He then set to work building the parts on our fleet of Stratasys 3D Printers and Manufacturing Centers.  To speed things up he spread the job up over three of our machines:  The FORTUS 400mc for the large white parts, the SST 1200es for the small black parts, and a few smaller parts here and there on the Elite.  Black and Ivory ABS was used for all of the parts that were made on the 3D Printers. He then spent about 15 hours post-processing the parts.

The post-processing was important because he found early on that friction between the ABS parts could be significant.  All of the sliding surfaces needed to be sanded and Acetone-Smoothed to get rid of any ridges that are a natural byproduct of the additive manufacturing process.  This proved to be the most difficult part of the entire process.

Meanwhile, he ordered and fabricated the few metal parts that he needed: the drive shaft (steel rod), the pendulum rod (aluminum tube), and the mass for the weight (stainless steel bar). I strong string was also found that could be used to suspend the weight.  Everything was then assembled and he spent some time tuning the mechanism to reduce as much friction as possible and to get the timing worked out on the mechanism.  After all was said and done, the material costs were around $700, and the total machine running time was around 60 hours total.

The end result is shown here in this video:

https://youtu.be/b7CZ_UR9d4o

When asked if he had any advice for someone who wanted to make his own clock, Justin replied “Do it, these plans make it quite simple to print one and with a lot more patience and skill you could even make one out of wood as the designer intended. I found making this clock to be a very enjoyable learning experience. “

We hope to have some time to try out some other designs, the PADT Colorado office is already making noise about wanting their own clock.  We will be sure to share the experience with everyone here on The RP Resource when we do.

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