Barrel Closing Tool for Watch Movements

prusaprinters

<p>This is a 2-piece barrel closing tool consisting of a lid and a base. &nbsp;Although fairly easily machined on a lathe, I figured 3D-printing a barrel closer might be useful for some watchmakers/watch repairers. &nbsp;The design of this tool is similar to Bergeon item #7922 “Tool for Closing Barrels” or Horotec MSA03.310 “Tool for Closing Watch Mainspring Barrel”.</p><p>The barrel lid should be flipped around to avoid printing overhangs (top side should be down facing the print bed). &nbsp;The dimensions are such that the lid should slide freely, without resistance, onto the base. &nbsp;There should also be very little side-to-side motion when in place. &nbsp;If the lid resists sliding onto the base, then either the lid should be scaled up slightly, or the base should be scaled down slightly. &nbsp;</p><p>This print was tested on the Prusa i3 MK3S+ and Mini+ on a 0.40mm nozzle at 0.10mm, 0.15mm, and 0.20mm layer heights. &nbsp;</p><p>The example shown in photos was printed on Overture Matte Light Gray PLA. &nbsp;My example with both the base and the lid shows some stringing. &nbsp;You may want to print them individually to avoid stringing and/or make sure your filament is dried properly. &nbsp;For added visibility, you may want to print the barrel closing lid out of a more transparent material. &nbsp;</p><p>To use, the barrel drum with arbor and mainspring installed is placed on top of the barrel closing tool base (concave surface). &nbsp;</p><figure class="image image-style-align-center image_resized" style="width:50%;"><img src="https://media.printables.com/media/prints/230373/rich_content/af9a7ac3-4007-47fb-8e63-daa2e968dedd/img_4646.jpg#%7B%22uuid%22%3A%22d1be2c59-7130-44b1-8d4b-4901d2f468cb%22%2C%22w%22%3A2016%2C%22h%22%3A1512%7D"></figure><p>Centering is important as the bottom of the arbor pokes through the bottom of the barrel and must have clearance. &nbsp;The barrel lid is placed on top of the barrel drum, with the top of the arbor poking through. &nbsp;</p><figure class="image image_resized" style="width:50%;"><img src="https://media.printables.com/media/prints/230373/rich_content/6ad80277-e99d-4112-8d1e-3b63a1173557/img_4647.jpg#%7B%22uuid%22%3A%2219c68615-5855-461e-b9d1-5bb644ecb7c0%22%2C%22w%22%3A2016%2C%22h%22%3A1512%7D"></figure><p>The barrel closing tool lid is then placed over the base. &nbsp;Again, the top of the arbor must be centered so that there is clearance. &nbsp;</p><figure class="image image_resized" style="width:50%;"><img src="https://media.printables.com/media/prints/230373/rich_content/5cff49ba-11c5-4cff-bef9-7488fac84b41/img_4648.jpg#%7B%22uuid%22%3A%22073de0ea-275a-4f91-8e9a-aed78258a965%22%2C%22w%22%3A2016%2C%22h%22%3A1512%7D"></figure><p>Pressing down on the lid will snap the barrel lid onto the drum, thereby assembling the component. &nbsp;</p><figure class="image image_resized" style="width:50%;"><img src="https://media.printables.com/media/prints/230373/rich_content/208e8d76-2ae6-47c3-bdb7-ccf95757c031/img_4650.jpg#%7B%22uuid%22%3A%227ebf89de-9a47-4009-b2e4-4418801afbf9%22%2C%22w%22%3A2016%2C%22h%22%3A1512%7D"></figure><figure class="image image_resized" style="width:50%;"><img src="https://media.printables.com/media/prints/230373/rich_content/6269564c-6aca-43df-af20-250003657edc/img_4653.jpg#%7B%22uuid%22%3A%226b466dfd-5265-4093-b49d-6751a6c66820%22%2C%22w%22%3A2016%2C%22h%22%3A1512%7D"></figure><p>&nbsp;</p>