FLEXIBLE Flashcards
When the distance between the driving shaft and the driven shaft is too great (usually less than 6 ft) to be connected by gears, ______ is used
flexible connector
Flexible connectors may be divided into three general classes:
- Belts 2. Ropes 3. Chain
may be used as a general term to denote all kinds of flexible connectors.
band
Bands for communicating continuous motion are
endless.
Bands for communicating reciprocating motion are usually
made fast at their ends to the pulleys or drums which they connect.
made of leather, rubber, or woven fabrics are flat and thin, and require pulleys nearly cylindrical with smooth surfaces.
Belts
are usually used for connecting shafts which are less than 15 ft apart.
V-belts
Speed ratios up to ____ and belt speeds up to ____ fpm may be used.
7 to 1, 5000
That is, the angular speeds of the shafts are in the _____ of the effective diameters of the pulleys, and this ratio is constant for circular pulleys
inverse ratio
and the pulleys turn in the same direction as suggested by the arrows.
open belt
and the pulleys turn in opposite directions
crossed belt
The material most commonly used for flat belts is.
leather
When the belt is to be run in a place where there is much moisture, it may be made largely of _____ properly combined with fibrous material in order to give strength.
rubber
______ are made by gluing or riveting together strips of leather cut lengthwise of the hide, near the animal’s back
Leather belts
If single thicknesses of the leather are fastened end to end, the belt is known as a _____ and is usually about 3/16 in. thick.
single belt
