Experienced gear molders caution design engineers to avoid common pitfalls with plastic gears. One old problem, says ABA/PGT, is misaligned mating parallel-axis (spur and helical) gear tooth surfaces. The solution is the modification of gear flanks by making them full thickness at mid-face-width and tapering them to each edge, as shown in the drawing below. This modification, extending over the full height of the gear tooth, is referred to as crowning. Other useful advice comes from UFE of Stillwater, MN. Operating temperature must be factored into designs using dissimilar materials. If a gearcase is made of metal and the gears are plastic, the distance between the gears will change because of the differing coefficients of linear thermal expansion.
The Beam Store from Suitable Technologies is managed by remote workers from places as diverse as New York and Sydney, Australia. Employees attend to store visitors through Beam Smart Presence Systems (SPSs) from the company. The systems combine mobility and video conferencing and allow people to communicate directly from a remote location via a screen as well as move around as if they are actually in the room.
An MIT research team has invented what they see as a solution to the need for biodegradable 3D-printable materials made from something besides petroleum-based sources: a water-based robotic additive extrusion method that makes objects from biodegradable hydrogel composites.
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