Solidworks Models Of Planetary Herringbone Gears

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The original models are too small meaning the gears are really stuck together after printing. I had to scale everything up to at least 1.5x to give the teeth enough clearance to break free and become independent after printing.

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I used an Ultimaker 2+ with a 0.25 mm nozzle and 0.08 mm layer height. Cooling fans were turned off for the smaller parts but not the main gear body. UPDATE: I just printed a second with 0.1 mm layer height and faster speeds and it doesn't run as smoothly. Ls dyna crack 64 bit bit.

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Try to print this with as small layers as possible with super slow speeds because I think it helps the gears break apart after printing. Or just scale the whole thing up by more than 1.5x UPDATE 2: Uploaded some slightly changed models: Changed handle shape, added a handle spacer so handle doesn't rub on the ring gear. Added a round outside surface to the ring gear so it's easier to hold. UPDATE 3: Added planet gear carrier version 2.sldprt and.stl files. New version allows access to sun gear bolt without disassembly. After printing I freed the teeth by scoring the bottom most layers where the teeth mesh and then twisting. The movement gets smoother after use and a little sewing machine oil.

I kind of winged it with the all the attaching hardware, I was lucky and had the right sized stuff laying around after I scaled up everything to 1.5x. The planet gears and carrier spacers are tapped for 1/4 - 20 threads, and the handle was tapped for 3/8 - 16 threads. The handle is screwed tightly to the sun gear so they are static relative to each other.

The carrier spacers are used as a sort of lock nut to keep the carrier screws static relative to the planet gears so they don't come out when you rotate the sun gear. The planet gear carrier (the triangular white thing) is free to rotate relative to the screws holding it onto the assembly. How I Designed This.

I used a gear generator found at to make.dxf files of each gear and then imported the drawings into solidworks. After I had the gears sketched out and cleaned up, (the imported.dxf files had a huge number of points) I extruded to half of my desired thickness and then used a flex feature on each gear body to get the desired twist. The degree of flex is different for each gear which took some time to realize. If the twist on the sun gear is x, then the planet gears need a twist of 2x and the ring gear 1/2 x. One set of flex features need to have negative twist too, but I can't remember if it's the planet or ring gears.