Rolling Interfaces
The contact regime of a bearing, put to work
Tell us the motion you want — a speed reduction, a particular path — and we compute the pair of raceway shapes that produce that motion through pure rolling. Power crosses the rolling contact itself; the retainer guides the pin and carries no load. Every contact you see in these animations is rolling.
Any Motion
Every machine ever built is assembled from the same short list of parts — gears, bearings, shafts, linkages, sliders, pulleys — all more than five hundred years old. Where they fall short, no amount of engineering talent has been able to force one to do what it can't. A rolling interface is a new part in that box: nearly any specified motion, held through rolling contact.
Corkscrew
A corkscrew whose mechanical advantage follows the force of cork removal — a motion no one would attempt with the legacy toolkit.
Learn More →Variable Mechanical Advantage
Mechanical advantage varying continuously from 4:1 through 1:4 — designed, then rolled.
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Speed Reducers for Robotics
Our first product line. The target is stated in units every mechanical engineer owns: the efficiency of a bearing with the function of a gearbox. The ratio is set by the difference in pin count between the front and back sets of a single unit — designs from 10:1 to 253:1 have been simulated, with no stacked meshes to pay for.
Precise Cycles
For 150 years, engineers have known the crank-and-piston cannot trace the motion an efficient thermodynamic cycle actually wants. A rolling interface can be shaped to deliver the piston height you specify at every shaft angle — so the cycle, not the crank, defines the geometry. The results below are design studies: modeled, not yet measured.
The cycle defines the geometry
Compressor
Smooth injection over 180 degrees of shaft rotation — potentially two cylinders doing the work of four.
Learn More →120 Degree Engine
Four strokes in 360 degrees, with a power stroke twice the length of the compression stroke.
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Case Studies
Robotic Walking
A leg joint that keeps the body level through the stride — walking about as efficient as rolling.
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