Mini morse paddle

thingiverse

Morse paddle inspired by http://members.ziggo.nl/cmulder/paddle.htm and http://www.palm-radio.de/ This paddle is very much a work in progress, but the current version (V2) is functional. Here it is in use (I'm a beginner operator, timing is a bit tight): https://youtu.be/1xGeypPl-cU The hardware required is the following : * 6 x M4x4mm set screws (https://www.mcmaster.com/92605a110) * 4 x M2.5x5mm phillips head screw (https://www.mcmaster.com/92000a103) * 2 x M2.5x12mm phillips head screw (https://www.mcmaster.com/92000a107) * 6 x M2.5 nut (https://www.mcmaster.com/91828a113) * 1 x ball plunger 5mmx6mm (http://a.co/d/gtlAK51) * thin headphone wire (2mm) [for example](https://www.markertek.com/product/2490/mogami-w2490-ultraflexible-miniature-microphone-cable-gray-per-foot) * for the v3 version: 3.5 mm CUI phone connector model [SJ2-35464A-SMT-TR](https://www.mouser.com/ProductDetail/CUI/SJ2-35464A-SMT-TR?qs=%2fha2pyFadujXKSHC8iTQaB3wFYjSKErzhvVx8GPUh5ZNghm%2fEx7nNwp0ezElnJJn) for adjusting the resistance : * 1/8x1/8 N52 magnets (https://www.kjmagnetics.com/proddetail.asp?prod=D22-N52) or * 1/8x1/16 N52 magnets (https://www.kjmagnetics.com/proddetail.asp?prod=D21B-N52) or a spring of 3mm or 1/8 OD **NOTE**: Depending on the material used, the center post may flex. This is happening with PETG. I am looking at option to make that section for rigid. If you have a suggestion, please add a comment. _11/17/2018_: First test with PCB 1/32" as the springboard. This is a bit stiff - around 50g to squeeze the paddle. Next test will be with some brass strips, and then 3d printed springboard with some copper shim glued on top to make the contacts. _11/28/2018_: Uploaded V2 : Ordered 0.6mm PCB from JLCPCB and got around 10g for 3mm of travel. 0.4mm PCB is available, but as a much more expensive option for small runs. Based on [some research](https://www.qsl.net/ik6bak/dynamometer.html), it seems that users want from 5 to 50g. This all depends on the travel. To get to 20g, this means a spring rate of 0.37lb/in and to get to 50g, we would need a preload of ~7.5mm, or a different spring rate. The paddles are 3mm thick - this may be possible. _12/07/2018_ : Uploaded case with holes for the ball plunger. Updated description _12/08/2018_: Uploaded dimensional drawing for the springboard. _12/18/2018_: Replaced the STL file for the paddle base as user notified me that some holes were missing. _01/06/2019_: Released version 3, with a 3.5mm connector, and a much more flexible paddle using a printed flex section.