Most of the things I design don’t have moving parts, so I printed emmitt’s Gear Bearing as a fondletoy:
Setting the clearance to 0.5 produced a free fit with absolutely no cleanup or run-in required; the center hole is a sliding fit for a 6 mm hex wrench.
I should do another one with knurling around the outside…
The picture has strongly desaturated reds, which reveals the top surface a bit more clearly.
The Smell of Molten Projects in the Morning 
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4 responses to “Planetary Gear Bearing”
Where did you set clearance … drawing file or slicer software?
On Mon, Dec 30, 2013 at 5:50 AM, The Smell of Molten Projects in the
There’s a
tolvariable tucked in the top of the OpenSCAD file that gets handed all the way down to the 2D gear generator, where it becomes a clearance adder: positive values reduce the gear radius. It also increases the outer gear radius, so there should be twice that amount between gears.I think the twisted geometry comes into play, because neither the tolerances I’ve measured on the printer, nor the final clearance on the part, come anywhere near the aggregate of 4x2x0.5 you’d expect from that description!
I’ll write up a knurled version with a 0.4 tolerance that’s just about perfect…
Not related to the topic at hand, but the decorative snowflakes on your page are real battery killers, completely pegging one of my 2Ghz CPU cores. Spinning up the laptop’s CPU fans might help the winter chill, but for the sake of your reader’s mobile devices you might want to consider rate-limiting the snowflakes.
WordPress doesn’t provide a speed knob, but they turn the snow off in early January.
Today’s blizzard will still be on the lawn by then…