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- From: Lawrence London <lfljvenaura@gmail.com>
- To: machinist@lists.ibiblio.org
- Subject: [machinist] Belt Tracking
- Date: Mon, 25 Jan 2016 23:55:59 -0500
http://www.visusa.com/belt_tracking01.htm
Belt Tracking
Pulley Crowns
Crowning one or several pulleys in a belt system is the most common way of tracking a belt. For flat power transmission belts and narrow conveyor belts (up_to_8_in.), a radius crown is used. For wider conveyor belts, a trapezoidal crown is typically applied. Note: Never utilize an apex crown! |
Radius Crown Specifications for Flat Belt Pulleys
Standard Radius Crown Heights h | ||||||
Pulley
Face Width Wp |
Pulley Diameter D | |||||
1-6 | 6-12 | 12-28 | 28-40 | 40-60 | >60 | |
in | in | in | in | in | in | in |
1-5 | 0.031 | 0.047 | 0.051 | 0.067 | 0.078 | 0.098 |
5-10 | 0.039 | 0.051 | 0.059 | 0.078 | 0.090 | 0.110 |
10-16 | 0.043 | 0.055 | 0.063 | 0.087 | 0.098 | 0.118 |
>16 | 0.047 | 0.059 | 0.078 | 0.098 | 0.118 | 0.137 |
The min. pulley face width Wp = (belt width Wb x 1.1) + 0.5 in.
The max. belt width Wb = (pulley face width Wp - 0.5 in) / 1.10
Trapezoidal Crown Specifications for Conveyor Pulleys
Pulley Diameter D | Crown Height h |
in | in |
1 to 2.75 | 0.012 |
2.75 to 4 | 0.017 |
4 to 6 | 0.022 |
6 to 8 | 0.026 |
8 to 11 | 0.034 |
11 to 14 | 0.042 |
>14 | 0.045 |
Note: | The cylindrical part of the pulley Wc is half of the belt width Wb. |
Also, it is recommended for the pulley width Wp to be approximately 10 to 20% wider than the belt width Wb for the pulley crown to function properly. For pulley widths less than 8 in., use a radius crown and refer to the flat belt pulley specifications above. |
- [machinist] Belt Tracking, Lawrence London, 01/25/2016
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