HK G3 Welding Alignment Jig

thingiverse

Hey all Here is a jig I created for help aligning an HK prior to welding cocking tube and trunnion into the receiver. It is meant to hold the assembly together similar to the jig formally available on RobertRTG. The entirety of this jig was made to contribute to the same community that gave me the G3 bending jig, sight alignment jig, and shelf alignment jig. I believe we are getting closer and closer to being able to produce fun things that go boom with much less than complex metal tooling and the like. This jig was used to complete a G3K clone, and had to be slightly fitted for perfect fit to factory parts (minor sanding if parts are out of spec, perhaps a ring of tape around cylindrical parts where the jig sits on them to provide a uniform clamping from the pieces). The parts are adjustable and should be able to be used with different lengths of builds. You could build a G3 length on the same jig as an HK51 with only minor adjustment in loosening bolts and sliding alignment pieces to different locations on the rods. The materials list are as follows: -1 Harbor Freight nut and bolt set SKU67624 (Best value for what you'll need, I used various washers from this kit. I believe all of the parts are set around M6x50 bolts and nuts) -some 3 ft lengths of 1/2" Aluminum rod (possibly wooden dowels if you can't find aluminum/ don't want to spend the money. I only used aluminum because it is generally more uniform in straightness and had some free scrap to take from work. If you are going to be using this for a G3K/HK51 build then you can use 26" or less rods) -less than a roll of ESUN PLA+ (depending on desired infill)