Vapor Blaster Gun

thingiverse

Update - 4/20/2022 - I incorporated the Oring centering part which eliminates the need to print it separately. I also added a tapered outlet to the tip of the inner jet to allow for air expansion just prior to the air/water mixing chamber which should slightly improve the efficiency. I also made the taper of the outer Jet end more severe to allow for greater slurry flow. Finally, I generated STLs for the following size inner Jet orifice diameters, 5mm 4mm 3.5mm 3mm 2.5mm 2mm This should be a wide enough selection at least for lower HP/CFM compressors. This way the user can print all 4 and try them all out, or maybe just have varying degrees of aggression. Whatever though, PLA is CHEAP! 6 perimeters and 25% infill. Update - 10/8 - All parts are printed and designs AFAIK are final. Everything fits great, the Oring seats well and nozzle aligns to it good as well, but larger Orings could be used if the STLs are re-rendered. I bought an Oring kit off Amazon and used the 13 x 3mm Oring. The Oring Brace is needed to center the Oring or it will move from center and not seal. Care must be given when threading the brass into the plastic to prevent the alignment of the 2 from wandering out of plumb with one another. Once 2 or 3 revs are passed, than the alignment should stay good, but the initial pairing will give you some grief. -------------------Parts needed 1 x 13 x 3 Oring 1 x 1/2" brass nipple with the hex in the middle for wrenching 2 x 3/4" brass nipple also with the hex middle If my needs demand it, I will make STLs with smaller air jets, but I have a 5HP motor turning a 7.5HP pump into an 80 gallon tank, so I might be okay with the 5mm jet. If you need a smaller jet for a smaller compressor, change "orfDia to whatever number of mm you need and press F6. It takes my old PC about 15 minutes to complete this action which is why I haven't created any other sized blast gun. --------------------Print Settings PETG or PLA 8-10 shells/perimeters At least 20% infill Print on a big raft. Some sanding will be needed on the nozzle bottoms, but it's a necessary evil. I also printed the main model on the raft as I lost a previous attempt of someone else's design and have since committed to the raft. My design may have enough surface area to stick to the glass, but why risk it, especially with PETG? This is a Vapor Blasting Gun that I've seen used on YouTube on various channels, but noticed there's none on Thingiverse, so I figured I'd contribute. Because I design with OpenSCAD, all of the major variables can be easily edited, new models rendered and new STLs generated therefrom. I'm still building my vapor blasting aka "vapor honing" cabinet, so I have no experience yet to know what are the correct sizes of things CFM wise, so expect updates to come. Note, that because Thingiverse has problems, I find updating a design using the Edit function does not work, so it is likely that as I update things, I will have to delete them from this site and reupload all of the new files. The design aims to receive brass nipples as the brass can cut their own threads into the tapered ports which then lends to rigidity of the connectors while also allowing for leeway between imperial and metric standards. I presume the NPT in America versus Europe are close in size, enough that the same holes will work, but if you wish to resize the 2 bit and 1 little hole, those variables are also right up top. The sizes I use are slightly larger than the beginning diameter of the pipe and reduce by 1.2mm in diameter in the depth of 15mm. There's a 3/4" and 1/2" inlet. The larger is for slurry and smaller for compressed air. The only outlet will receive a 3/4" nipple and using the exposed metal threads, I can design a compression cap to screw on and seat a nozzle onto the O ring to complete the design.