Platinum Belt Design Manual - Jason Industrial

DRIVE CALCULATION
PROCEDURE
POWERING GLOBAL INDUSTRY
STEP 2 - BELT PITCH SELECTION
The preliminary belt type and pitch can be selected from Table 3, using:
• the design power P d obtained in Step 1-d);
• the rpm of the faster shaft (smaller pulley) in the drive.
TABLE 3 - BELT PITCH SELECTION TABLE
nf (Speed on Faster Shaft)
Speed RPM
P d - DESIGN POWER (HP)
Locate the design power along the X-axis of the graph. Read up to the rpm of the faster shaft; for the
preliminary belt pitch. Choose the pitch surrounding the point. Inside the dark line is 8mm and inside
the light line is 14mm. If the point of intersection falls outside of a specific area, contact Jason
Engineering. If the point falls inside the intersection area of 8mm and 14mm, a good drive can likely be
designed using either belt pitch. Jason Industrial suggests designing the drive with both belt pitches
and select the one which best meets the layout or minimum cost requirements.
STEP 3 - SELECTION OF BELT, PULLEYS AND CENTER DISTANCE
a) Determine the Speed Ratio (SR) by dividing the rpm of the faster shaft by the rpm of the slower
shaft. SR = n f /n s [3]
b) Refer to the center distance selection tables (pages 24 through 59) to determine which pulley
combinations have speed ratio closest to the desired speed ratio. Inspect the table for the
combination of pulleys and belts that is closest to the desired center distance. The pitch lengths
are given at the top of each table.
c) Belt service life is reduced if the ratio of the teeth on the belt to the number of teeth on either pulley
is an integer. If this happens, it is suggested that another drive combination be chosen.
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