![]() ![]() Holding the part in my hand, recreating the grasp shown in the movie, the overall size seems really good. I felt I was on the right path, and that the result was not bad for an hour's work. #JACK SPARROW COMPASS MOVIE#Ditto with the circle diameter, which I sized to 70mm, a nice round number that also cut into the triangles quite similarly to the actual movie prop. It's the same thing I do when designing parts, as I prefer seeing round numbers in a design versus long fractional numbers. I think I was right to guess that an engineer designed this in CAD before making the model, and likely used similar if not identical numbers in their design. The circle I sized to 4mm wide, the edges to 3.5mm wide, and the corner triangles to 3mm wide. I also again used nice round'ish numbers for sizing the metal frame. I made the gaps between the wood panels and metal sections larger than the gaps between the metal to metal joints, as I figured that more closely resembled real-world manufacturing techniques. Below you can see my design in progress on the right, with the original Thingiverse design on the left. In the design, I placed fairly large, exaggerated gaps between the various metal frame segments and wood panels. Obviously these numbers are still just guesses, but if you change them by even 1 mm in any one direction, you get a significantly larger/smaller model or throw off the ratio of corner length to side length, so I went forward with the dimensions I had calculated. And the 18mm wide corners create a diagonal that is 25.5mm long, approximately 54% of the 47mm length. For example, I figured it was more likely that the side was a rounded 47mm long, and not a fractional 46.8423mm.īy plugging in nice round numbers into my spreadsheet, I found that that if you divided a square into a tic-tac-toe grid, with the central section exactly 47mm wide, and the corner sections exactly 18mm wide, that you ended up with an overall size of 83mm. I put my engineer's hat on for this task - and by this I mean I went at this as if I was designing a prop from scratch with no specs, and used nice round numbers. ![]() I then created another formula to plug in different lengths and see what came out. I found that the corners were approximately 55% as long as the sides. I did this by measuring some screenshots and plugging the values into a spreadsheet to come up with a general ratio of side-length to corner-length. Next I needed to determine the size of the fileted corners. Also, the creator of the Thingiverse model had graciously provided the Fusion 360 model for download, so I examined that one and found it was sized to 82mm. I determined that the compass size is likely between 80mm and 90mm, probably close to 84mm by the looks of it. Obviously hand sizes differ, though with Johnny Depp being about the same height as I am (he's 5' 10", I'm a smidge less than 6'), I figured my hand was similar in size to his and would be good to measure. I started with the screenshots showing the compass being held in-hand, and positioned my hand in a similar pose, and measured between my thumb and fingers. The first step was to get the dimensions right. Perhaps I could even make this the nicest replica of them all. The more I thought about creating my own, the more I preferred this path, as it allowed me to integrate some alternate materials like real wood. I found a lot of hand-made examples that didn't even pass the glance test (one glance and you knew it was fake), and even the good ones still looked like painted plastic. Of the various designs, I prefer the look of the smaller triangle design shown above, so that's my target.Īlso, before starting down this path, I like to check and see if an official prop already exists for purchase. This is quite common in movies, where props change from movie to movie, or even in the same movie (Indiana Jones and the Raiders of the Lost Ark have two medallion designs in the same movie, made by two different prop houses, and used for different scenes). The face decal (called a compass rose or windrose, or "Rose of the Winds") has two different designs. NOTE: After much research, I see that the compass design is not consistent even in the Disney movies. ![]() So I decided that if I was going to bother with this prop, I was going to have to recreate the design from scratch, so I could achieve the level of realism I wanted, while making design changes to make printing easier without excessive support structures. I really hate using supports, as they mar the finish and require a lot of post processing to clean them up, and with the way this model was designed, there wasn't a good angle to minimize supports. #JACK SPARROW COMPASS HOW TO#I also had to consider how to actually print this model. ![]()
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