Watch Winder by simo_dax Remixed

thingiverse

<iframe width="560" height="315" src="https://www.youtube.com/embed/_pg3JUhZevs" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe> I tried <a href='https://www.thingiverse.com/thing:2021221'>Simone Dassi’s Watch Winder</a>, however my motor axis was rather wobbly (it could be pulled in and out by about 1mm) which consequently made the cylinder (Simone’s rotating_part.stl) wobbly. So I redesigned it to add a large bearing to firmly secure the cylinder to the base, so I could and use the motor exclusively to drive the cylinder, as opposed of also using it as a structural element. Note that depending on the precision of your printer, you might need to add some masking tape between the cylinder and the bearing, as it needs to be a tight fit (the bearing goes on the cylinder, and stays there). I designed the "wrist" part in multiple sizes and designed it so it can collapse on itself to accommodate different watch sizes (to print in TPU) and hold watches firmly in place, I also replaced the tongue and grove of Simone's original initial design with magnets to make slotting easier. Finally, I made an effort to make the winder smaller to save space and consolidated the parts (from 6 to 3) to reduce printing time. <strong>Wrist sizes</strong> (approximate) * Tiny: 12 - 14 cm * Small: 14 - 16 cm * Medium: 16 - 19 cm * Large: 18 - 21 cm <strong>Instead of Magnets</strong> (approximate) <a href='https://www.thingiverse.com/pcprogmxde/designs'>Ronald Kattner</a> commented about the negative impact of magnets on the watch mechanics, as such i added a plug, that would slot into the "wrist" to serve as a push button to lock the wrist in the cylinder, must be printed in TPU with little infill (1-2%) to work. <strong>Note about the electronics and code</strong> Diagram and code were <a href='https://www.instructables.com/3D-Printed-Watch-Winder-ATtiny85Stepper/'>taken from here</a>. My code is in the <strong>Code and such.rename to .zip.txt</strong> file which needs to be renamed to <strong>Code and such.zip</strong> in order to be extracted (Thingiverse does not allow zips). Simone’s code is good, I had a few issues with timing, most likely I flashed a 8Mhz boot loader instead of the 1Mhz (which I suspect is what was done), here are the changes I made: * DELAY 3, for me that was way too fast (the motor buzzed but did not turn), I replaced it to 80 which gives 19 seconds rotations, * I adjusted the number of spin cycles to 3500 which gives to approximately 2 minutes of rotation, and * extended the sleep count to 114440 (switching count to an uint32_t), which gives 31 minutes of pause between cycles. According to my calculation, this gives 320 rotations per day, which is a very conservatively safe amount, after all we need to keep it alive, not maximum charge. Patek <a href='https://watch-winder.store/watch-winding-table/patek_philippe/'>recommends 600-800 turns per day</a> for their watches, in which case maximum sleep count be reduced to 57220, which would translate to 16 minutes of pause between rotation cycles. This said, I’m a bit concerned that the motor breakout is always powered on and not switched by a transistor or a relay, so I will most likely use a outlet timer to switch it on and off. There is a note about editing the code for Clockwise and Counter Clockwise, however you simply need to flip the connector on the motor driver breakout board from pin 1-4 to 4-1 (one will be counter clockwise). Finally, I placed the ATtiny85 on a small enough breakout that it can fit in the front, so I can pop it out to re-program it when needed. <strong>Parts I used </strong> * Socket screw M6 x 10 (for the wrist) * Neodymium Magnet 12x5 Hole 4 <a href='https://www.aliexpress.com/item/1005004230942586.html'>AliExpress</a> * Ball Bearing 6806 - 30mm I.D, 42mm O.D, 7mm T <a href='https://www.aliexpress.com/item/4000007107067.html'>AliExpress</a> * Micro USB Breakout Board <a href='https://aliexpress.com/item/32787402271.html'>AliExpress</a> * DIP IC Sockets - 2.54MM 8 Pin <a href='https://www.aliexpress.com/item/32845143005.html'>AliExpress</a> Enjoy!