SAE J636:2019 pdf free

SAE J636:2019 pdf free.V-Belts and Pulleys
Belt length and SAE size are defined by using effective length and rideout as measured in standard pulleys. These are determined by use of a measuring fixture comprised of two pulleys of equal diameter, a method of applying force, and a means of measuring the center distance between the two pulleys. One of the two pulleys is fixed in position while the other is movable along a graduated scale. The fixture is shown schematically in Figure 2. Specifications for measuring pulley dimensions are given in Tables 2A and 2B and Figure 3.
To measure the length, the belt is placed on the measuring fixture at the force shown in Tables 3A and 3B, and rotated around the pulleys at least two revolutions of the belt to seat the belt properly in the pulley grooves and to divide the total force equally between the two strands of the belt. The mid-point of the center distance travel of the movable pulley defines the center distance and will be measured through one revolution of the belt minimum after the two seating revolutions. The belt effective length is equal to two times the center distance plus the effective pulley circumference. Standard belt center distance tolerances are shown in Tables 4A and 4B.
The belt rideout, as measured along the circumference of the belt, must fall within the specified tolerance at all points, with the exception of measurements at points of dimension variations inherent to the manufacturing process or product such as material splices, belt identifications, etc.
A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only.SAE J636 pdf free download.