![]() Movie where I put it to the test with an electric drill – soon. It’s working! It’s flimsy, doesn’t take too much load, easily falls out, is too loose (I could shave about 0.3mm off the tolerances), but it works! Ok, this time I will stack them very carefully and engrave them with unique calibration markings on top: The gear ratio is around 1:50 if I remember correctly. ![]() So it may seem like the following movie is acceptable but in reality the gearbox is losing a step every now and then. Each is unique and all three should be printed. The next sketch is not that great – I tried making and actual compound planetary gearbox by putting just one gear on top of each other and calling it a day, but it turns out the three planets ARE NOT IDENTICAL. So maybe I’ll start with the flat ones? Either way, I need to modify it a lot to get a screwless version.įirst of all, let me strip it bare-naked to the gears:īut I can’t print it like that! So let me make it a double-helical gear (Wikipedia: Herringbone gear) Even with helical gears, but I want to have total control over the process. So first – is there a planetary gearbox on Thingiverse? And most important – …OpenSCAD? So the idea is to create a simple planetary gearbox, with a small, tiny ratio of… I dunno, 1:50? 1:100? Oh, and I hate screws, make that without bearings and as few screws and nuts as possible (but not none, I want to slap a sign “May contain nuts” on it later on). Writing code AND getting a graphical result instead of working on my thesis? I can do it any time (don’t tell my supervisor). The geometry of gears is quite complex so I thought I’d check the Thingiverse library for examples I could use. This will check both the printers ability to print detailed shapes and also if there is any warping. So not very much.Īll my gearboxes are scrapped from different servos, be it small 9g 1$ blue servo (SG-90) or a “slightly” more expensive Dynamixel MX-64. As part of the RoadTest of the CEL Robox 3D Printer I proposed to look at printing some gears. ![]() The code to place the gears is pretty compact and might be a useful trace to produce a FreeCAD script. The bonus is that the gears are done with actual involute profiles, the drawback is that being OpenSCAD you will get no curved edges, but many straight segments. During my recent works with SEA (Series Elastic Actuators) I was using motors with gearboxes and was happy – as happy as a researcher can be in that scenario. Re: challenge fully parametric planetary gear system.
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