thibaultron Posted January 2, 2016 Share #1 Posted January 2, 2016 Part 01 Please forgive me for any typos. This log will be my journey from a 2D drawing to producing (well having printed), a 3D model. The subject model is a Hand Cranked Oyster Dredge Winch. These were used on Chesapeake Bay oyster dredges, before the advent of gas engine driven winches. The winches are used to pull in the dredge after it has scraped the oysters from the oyster bed. The original winch was about 36 inches high at the crank/drum axle. The original winch parts were castings for the major components. Here is a photo of the winch at a museum, with a dredge frame behind it. Here is a picture of the finished 2D drawing (the crank handles are still too long, I corrected this in the 3D SketchUp drawing), and a 3D projection, of an earlier version. Why didn’t I just go from the 3D CAD to a 3D printed part? For the 3D CAD drawing, above, I had developed it using just proportions, and some guesses. A friend, then sent me some rough dimensions, and I redrew it. The 2D drawing is of this final version. I decided to go directly from this drawing to SketchUp, a dedicated 3D solid CAD program. There is a free version of SketchUp, that I used for the majority of the drafting. The only real function it lacks is the ability to import DXF files, a standard CADing file type. I have an earlier Pro version, that I used for importing my 2D drawing. It also lacks some 3D solids Boolean functions, but these are not needed, you can do them yourself, it just takes a little more work. Parts you generated based on a drawing, which are generally “Extruded” from the 2D lines to give them height (You’ll see what I mean later), can’t be operated on by these functions anyway. The free version of SketchUp, can however, import graphics files, so you could either use your CAD program to create a graphic, and import that, or just use it as a reference when creating the parts in SketchUp. SketchUp has the ability to import “Extensions”, additional mini programs, to add functionality. I used several of them, and will list them later. For now here is the finished SketchUp drawing. This is the 1/32nd scale version, I had to modify the parts for 1/64th scale, to meet the minimum wall thicknesses the 3D printing company required. In this scale, I will be using metal rods for the axle and support rods tying the legs together. I’m creating both 1/32 and 1/64 scale parts for 2 different models. The 1/64th scale winches are for my Pyro Oyster Dredge model, which is a fairly good model of the skipjack “Carrie Price”. The 1/32nd ones are for a planed future scratch build of the same boat. I also need a set of 1/28th scale winches for my Midwest Skipjack. The 1/28th scale parts will be a simple scale up of the 1/32 drawing, no modifications needed. The company I used for the printing was Shapeways. There are others out there, but I choose Shapeways as they specializes in serving modelers. They also have an online file/drawing checking system to find any problems with your drawings, before you try to have them printed. Below is a picture of the printed 1/32nd scale parts. I stuck the crank handles into foam to hold them, hence the unpainted tips. The gear is 5/32” in diameter, and has 18 teeth. The teeth printed out sharply. 3D printing can give you quite nice detail. I don’t yet have any pictures of the 1/64th scale parts, I have not primed them yet, and without this they are hard to see even under magnification, but I can distinctly feel the gear teeth with my figure nail. Ryland Craze, avsjerome2003, Remcohe and 10 others 13 Quote Link to comment Share on other sites More sharing options...
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