Welded On Profiles and Flights Specs
Profiles and Flights tolerances
The standard pitch to pitch tolerance between profiles is +/-0.5mm. Standard height tolerance is +/- 0.5mm. Improved tolerances available, subject to tooling being available.
Profile thickness ‘s’
The belt flexibility can be affected by the profiles or flights if a fairly thick profile is selected. As a rule, the profile or flight thickness ‘S’ should be as small as possible to perform the required task (the shear strength of a profile or flight is approximately 160 N/cm ). The following table illustrates the relationship between the chosen pulley size and the maximum corresponding profile or flight thickness ‘S’. If the maximum thickness ‘S’ is exceeded, there is a danger of cracking, as shown in the diagram (Fig.1- right).
| Pitch | Profile/Flight width (mm) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of teeth in pulley | 20 | 25 | 30 | 40 | 50 | 60 | 100 | |||||||
| Position type | 1 | 2 | 1 | 2 | 1 | 2 | 1 | 2 | 1 | 2 | 1 | 2 | 1 | 2 |
| T5 | 5 | 2 | 6 | 2 | 6 | 3 | 8 | 4 | 9 | 6 | 10 | 8 | 12 | 10 |
| T10 | 8 | 3 | 9 | 4 | 10 | 4 | 12 | 6 | 14 | 9 | 15 | 12 | 20 | 20 |
| T20 | 12 | 5 | 13 | 5 | 15 | 6 | 18 | 8 | 20 | 12 | 23 | 20 | 30 | 30 |
| AT3 | 5 | 2 | 5 | 2 | 6 | 3 | 6 | 3 | 8 | 4 | 9 | 6 | 10 | 8 |
| AT5 | 5 | 2 | 6 | 2 | 6 | 3 | 8 | 4 | 9 | 6 | 10 | 8 | 12 | 10 |
| AT10/ATP10/ BAT 10/SFAT 10 | 8 | 3 | 9 | 4 | 10 | 4 | 12 | 6 | 14 | 9 | 15 | 12 | 20 | 20 |
| AT20/SFAT 15/SFAT20 | 12 | 5 | 13 | 5 | 15 | 6 | 18 | 6 | 20 | 12 | 23 | 20 | 30 | 30 |
| XL | 5 | 2 | 6 | 2 | 6 | 3 | 8 | 4 | 9 | 6 | 10 | 8 | 12 | 10 |
| L | 6 | 3 | 7 | 3 | 8 | 4 | 10 | 5 | 12 | 7 | 13 | 10 | 16 | 16 |
| H | 8 | 4 | 9 | 5 | 10 | 6 | 12 | 7 | 14 | 10 | 15 | 12 | 20 | 20 |
| XH | 13 | 5 | 14 | 5 | 15 | 6 | 18 | 8 | 20 | 12 | 23 | 20 | 30 | 30 |
Profile thickness example
Determining the profile or flight thickness ‘S’ on a T10 BRECO® belt running around a 20 tooth pulley:
- For profiles or flights positioned over the tooth form, profile or flight thickness ‘S’ <=8mm
- For profiles or flights positioned over the tooth gap, profile or flight thickness ‘S’ <=3mm
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