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2. Ball transfer unit - Wikipedia

   en.wikipedia.org/wiki/Ball_transfer_unit

   Ball transfer unit Cross-section through a spring-loaded ball transfer unit with a polymer seal ring and a drain hole in the bottom. A ball transfer unit is an omnidirectional load-bearing sphere mounted inside a restraining fixture. They are identical in principle to a computer trackball (pointing device). Typically the design involves a ...

3. Brannock Device - Wikipedia

   en.wikipedia.org/wiki/Brannock_Device

   Brannock Device [1] Brannock Device at shoe museum in Zlín, Czechia. The Brannock Device is a measuring instrument invented by Charles F. Brannock for measuring a person's shoe size.

4. Caster - Wikipedia

   en.wikipedia.org/wiki/Caster

   A swivel caster. A caster (or castor) is an undriven wheel that is designed to be attached to the bottom of a larger object (the "vehicle") to enable that object to be moved. Casters are used in numerous applications, including shopping carts, office chairs, toy wagons, hospital beds, and material handling equipment. High capacity, heavy duty ...

5. Gyroscopic exercise tool - Wikipedia

   en.wikipedia.org/wiki/Gyroscopic_exercise_tool

   The rate of rotation of the internal ball increases as the total amount of torque applied is increased. The direction of the torque does not matter, as long as it is perpendicular to the plane of rotation of the ball. The friction of the ring increases on the side opposite to the plane of rotation.

6. Caster board - Wikipedia

   en.wikipedia.org/wiki/Caster_board

   Foot placement is critical on a caster board because one wheel rests under each foot while in use. In order to start with proper foot placement, it is necessary to have the front foot above the center of the front caster and to allow the back foot to give a good push of speed that will allow the board to keep proper balance.

7. Dental drill - Wikipedia

   en.wikipedia.org/wiki/Dental_drill

   Air turbine used in a dental handpiece Correlation between rotational speed and torque Correlation between rotational speed and turbine output power. The turbine is powered by compressed air between 35 and 61 pounds per square inch (~2,4 to 4,2 bar), [1] [2] which passes up the centre of the instrument and rotates a Pelton wheel in the head of the handpiece.