Morse Code Straight Key

thingiverse

Update 4/17/17 - I have added a center beam for non-conductive plastic which removes the countersinks for the threaded inserts. I have also tweaked the conductive plastic design to slightly reduce the threaded insert countersink. I noticed some were loose after cleanup. This was inspired by NA8E's morse code key http://www.thingiverse.com/thing:630117. I created this in Solidworks from scratch and went through 4-5 versions before settling (for the moment) on this one. Similar to the NA8E key this one uses bearings and a precision fit shoulder bolt to support the main beam for smooth operation. This one uses all brass 4-40 hardware and brass inserts for the plastic to keep from stripping out or pulling out. Another feature of this key is the center beam can be printed from conductive plastic to make connections to the top contact at the rear of the beam. It also has gap adjust and spring tension adjust. The hardware necessary for this includes: 2 686-ZZ Bearings 13mm OD, 6mm ID, 5mm Thick 1 6mm dia x 45mm shoulder bolt 1 M5 x 0.8 nylon insert nut (McMaster 90576A104) 4 4-40 narrow brass hex nuts (McMaster 95130A110) 3 Screw to expand brass inserts for 4-40 (McMaster 92395A315) 1 4-40 round head brass 5/16" screw (McMaster 94070A107) 1 4-40 round head brass 5/8" screw (McMaster 94070A112) 2 4-40 round head brass 1" screw (McMaster 94070A115) Check my personal site K5ABL.com for availability of printed keys, customized keys with call sign and hardware kits only. Print Settings Printer Brand: Rostock Printer: Rostock MAX V2 Rafts: No Supports: Yes Resolution: .4mm nozzle, 0.2 or 0.25mm layer Infill: 70% Notes: Base - 1.75mm PETG @ 260C Beam - 1.75mm PETG @ 260C or ProtoPasta Conductive PLA @ 220C 35mm/sec print speed support only on base - touching build plate only Post-Printing Support will need to be removed under base. Cross holes on base and beam for shoulder bolt will need to be cleaned up. Recesses for bearings will need to be cleaned up. Bearings should be a firm press fit and run shoulder bolt through bearings before assembling to align bearings. Inside of bearing supports and center beam where it contacts support will need to be filed/sanded just to smooth. Do not remove material or you will get some unwanted side play. You will need to sacrifice a Pilot G-2 Pen or similar for its spring Beam recesses for brass inserts need to be cleaned up only. Do not enlarge or inserts will not grip. How I Designed This Designed in Solidworks 2012. Files provided in parasolid format for better portability