Play
Some applications apply bearing loads from varying directions and accept only limited play or "slop" as the applied load changes. One source of motion is gaps or "play" in the bearing. For example, a 10 mm shaft in a 12 mm hole has 2 mm play.
Allowable play varies greatly depending on the use. As example, a wheelbarrow wheel supports radial and axial loads. Axial loads may be hundreds of newtons force left or right, and it is typically acceptable for the wheel to wobble by as much as 10 mm under the varying load. In contrast, a lathe may position a cutting tool to ±0.02 mm using a ball lead screw held by rotating bearings. The bearings support axial loads of thousands of newtons in either direction, and must hold the ball lead screw to ±0.002 mm across that range of loads.
Read more about this topic: Bearing (mechanical)
Famous quotes containing the word play:
“Most of our occupations are low comedy.... We must play our part duly, but as the part of a borrowed character. Of the mask and appearance we must not make a real essence, nor of what is foreign what is our very own.”
—Michel de Montaigne (1533–1592)
“Every time a child organizes and completes a chore, spends some time alone without feeling lonely, loses herself in play for an hour, or refuses to go along with her peers in some activity she feels is wrong, she will be building meaning and a sense of worth for herself and harmony in her family.”
—Barbara Coloroso (20th century)
“They want to play at being mothers. So let them. Expressing tenderness in their own way will not prevent girls from enjoying a successful career in the future; indeed, the ability to nurture is as valuable a skill in the workplace as the ability to lead.”
—Anne Roiphe (20th century)