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:
“While I play the good husband at home, my son and his servant spend all at the university.”
—William Shakespeare (15641616)
“The child knows only that he engages in play because it is enjoyable. He isnt aware of his need to playa need which has its source in the pressure of unsolved problems. Nor does he know that his pleasure in playing comes from a deep sense of well-being that is the direct result of feeling in control of things, in contrast to the rest of his life, which is managed by his parents or other adults.”
—Bruno Bettelheim (20th century)
“Only where love and need are one,
And the work is play for mortal stakes,
Is the deed every really done
For Heaven and the futures sakes.”
—Robert Frost (18741963)