BRECI flex B107 Polyurethane Timing Belts Instructions

BRECI flex B107 Polyurethane Timing Belts

Design Guidelines, Materials and Finishes

The Polyurethane Timing Belts offered by this product are known to be the world leader. The product is designed with Pulley Design Guidelines, Materials and Finishes to provide reliable and efficient operation. The pulleys are categorized into different series such as T-Series, AT-Series, ATL-Series, Imperial-Series, HTD/STD-Series, Self-Tracking-Series, SFAT-Series, and ATP- Series with different pitches available for each series. The user manual also provides guidelines for customizations such as normal gap, reduced backlash SE, and zero backlash 0 for the Imperial-Series Pulley.

Pulley Pitch Range

*Please contact us about AT8 available pitches

Product Usage Instructions

1. Choose the appropriate series and pitch range for your application from the table provided in the user manual.
2. Refer to the Pulley Design Guidelines, Materials, and Finishes section to ensure that the product meets your requirements.
3. If customization is required, follow the guidelines provided in the manual for the Imperial-Series Pulley.
4. Place an order by providing the appropriate product code, for example, 5694(3)(*23(:/ 9,+.
5. Install the product according to the instructions provided in the manual for optimal performance.
6. For any queries or assistance, please contact us.

Pulley Pitch Range

Pulley Customizations

Made-to-order pulleys come in a wide variety of options. BRECOflex CO., L.L.C. can provide any customizations with one of the fastest lead times in the industry thanks to our highly skilled CNC machinists, engineers and production staff at our USA headquarters. Our application engineers and customer service staff can assist with your order and in most cases, custom pulleys will ship in 8 days or less. Our flexibility and production capabilities enable you to order prototypes and short runs as well as production quantities.

BRECOflex CO., L.L.C. will also manufacture pulleys in materials including steel, stainless steel and Delrin® with a variety of special finishes. See page 178 for more details.

Pulley Tooth Design

Overview

Selecting a special pulley tooth gap can increase the accuracy of the timing belt system by decreasing or eliminating “play” between the timing belt and the pulley. Linear drives and systems requiring precise positioning and high repeatability or fast settling times can benefit from reduced “play.” The illustrations below show the meshing of the timing belt with the tooth gap designs available for metric pitches. For drive designs using “SE” or “O* – tooth gap pulleys, please consult BRECOffex CO., L.L.C. applications engineering department.

NOTE: Tooth gap will vary with the number of pulley teeth (See chart on next page)

Belt Elevation and Contact Surface Comparison

Pulley Tooth Design

BRECOflex CO., L.L.C. offers three pulley tooth designs for metric pitches as follows:

NORMAL BACKLASH REDUCED BACKLASH ZERO BACKLASH

Standard – Standard tooth design will be supplied if no options are specified when ordering. Options – Optional tooth design must be specified at the time of ordering otherwise the standard tooth gap design will be provided.

Tooth Designs Based on the Number of Pulley Teeth

Overview of available tooth gaps

Pitches That Apply to the Chart (Including Self-Tracking)

Ordering Example

• NORMAL BACKLASH AL 42 AT 10 / 24-2
• REDUCED BACKLASH “SE” AL 42 AT10 – SE / 24-2
• ZERO BACKLASH “O”

Precision Pulleys

Belt Width in Relation to Pulley Face Width

Metric Pitches

Flanged/un-Flanged Pulleys
Pulley Face Width (mm)| 8| 12| 14| 16| 22| 26| 32| 40| 60| 85| 110| 160
Self-Tracking
Pulley Face Width (mm)| | | | | 21| 25| 30| 37| 55| 80| 105| 155

English Pitches

Belt Width (mm)| 6.35| 7.94| 9.53| 12.7| 19.1| 25.4| 38.1| 50.8| 76.2| 101.6| 152.4
---|---|---|---|---|---|---|---|---|---|---|---
Belt Width (inch)| .25| .313| .375| .5| .75| 1.0| 1.5| 2.0| 3.0| 4.0| 6.0
Flanged/un-Flanged Pulleys
Pulley Face Width (mm)| 12| 14| 16| 19| 25| 32| 44| 59| 84| 111| 163
Pulley Face Width (inch)| .472| .551| .63| .748| .984| 1.26| 1.732| 2.323| 3.307| 4.37| 6.417
Self-Tracking
Pulley Face Width (mm)| | | | | | 30| 43| 55| 80| 105| 157
Pulley Face Width (inch)| | | | | | 1.181| 1.693| 2.165| 3.15| 4.134| 6.181

Minimum Number of Pulley Teeth and Idler Diameter

Pulley Materials and Finishes

__

Type

| __

Material

| Properties
---|---|---
__

(AL)

| __

Aluminum

| • Suitable for moderate power transmission

• Lightweight/reduced rotational inertia

• Moderate chemical and corrosion resistance

• Standard material for stock pulleys

__

(VA)

| __

Stainless Steel

| • Suitable for high-power transmission

• Durable / Abrasion resistance

• Meets FDA regulations

• Excellent chemical and corrosion resistance

__

(ST)

| __

Steel

| • Suitable for high-power transmission

• Durable / abrasion resistant

• Limited chemical and corrosion resistance

__

(POM)

| __

Delrin ®

| • Limited power transmission

• Excellent chemical and corrosion resistance

• Non-metallic

• Stainless steel flanges recommended

Note: Other materials are available upon request.

Aluminum Surface Finishes

| Properties
---|---

Anodizing

| • Increased chemical and corrosion resistance

• Available in clear, black or colored

• Limited increase of surface hardness

• Aesthetic treatment

Hard Anodizing

| • Excellent chemical and corrosion resistance

• Increased surface hardness

• For abrasive environments

Steel Surface Finishes

| Properties
---|---

Black Oxide

| •  Increased chemical and corrosion resistance

•  Aesthetic treatment

Zinc Plated| •  Increased corrosion resistance

Chromate

| •  Increased chemical and corrosion resistance
Nickel Plated| •  Increased chemical and corrosion resistance

Pulley Locations

Pulley vs Idler In general, timing belt systems are tensioned with the help of idlers. For one-directional drives, idlers are placed best close to an engaging belt into a pulley. For bi-directional drives, the idler should be placed in the center between both pulleys. In both cases, “a” should be at least 5x belt width.

Perpendicular Drive

BRECOflex CO., L.L.C. timing belts and pulleys can be used for angular drives. Some general guidelines should be considered. The outside tension members experience more stress, so the following sizing recommendations should be maintained.

• IT = CTC distance
• b = belt width IT / b >=20

Flanges and Alignments

Flange Recommendations

Pulley flanges are the appropriate method of belt tracking for most timing belt drive and conveying systems. Flanges retain the belt on the pulley by resisting lateral forces that pull the belt to one side or the other. Flanges are attached to the pulleys by a rolling process or fastened with screws depending on tooth profiles and pulley diameter. Small and medium-pitch pulleys up to approximately 250mm in diameter are usually supplied with rolled-on flanges. Large pitch pulleys such at T20, AT20, and XH, are commonly supplied with screwed-on flanges. For general recommendations concerning where to use flanges, please see the illustrations below.

Pulley Tracking with Flanges

• Flanges can be used on one pulley only for systems with close center-to-center distances.
• Flanges on back side idlers can be used to track belts when flanges on the tooth pulleys are not an option. Always locate the idler on the slack side of the belt towards the return pulley as shown.
• For reversing applications, locate the idler between the pulleys.

Alignment

Tolerances

Geometric Tolerances

BRECOflex CO., L.L.C. offers the most precise tolerances for superior belt drive performance. BRECOflex metric pitch pulleys conform to DIN 7721 tolerances while English pitch pulleys conform to DIN ISO 5294 tooth forms. All other pulley dimensions conform to DIN 7168 standards. Choosing a BRECOflex belt and pulley guarantees optimal belt matching and low-friction drive components.

Outside Diameter and bore

Tolerance

Outside Diameter| h8
Bore| H7

Concentricity

Note: Made-to-order pulleys: Outside diameter to Bore Stock Pulleys: Hub to Bore.

Run-out

Regional Sales Offices

Atlanta| (770)317-8745| Dallas| (214)476-5650| Miami| (770)317-8745| Richmond| (804)387-5760
---|---|---|---|---|---|---|---
Bay Area| (661)713-0121| Denver| (303)470-7226| Milwaukee| (908)461-6995| Seattle| (503)781-3631
Baltimore| (804)387-5760| Detroit| (908)433-0036| Minneapolis| (908)461-6973| Salt lake City| (303)470-7226
Boston| (603)496-5833| Ft. Wayne| (908)461-1168| Nashville| (732)757-6647| San Antonio| (214)476-5650
Buffalo| (412)600-5632| Grand Rapids| (908)461-1168| New York| (732)829-7773| Toledo| (908)433-0036
Charlotte| (908)461-3937| Houston| (214)476-5650| Philadelphia| (732)829-7773| Toronto| (416)476-7107
Chicago| (908)461-6995| Indianapolis| (908)461-2344| Phoenix| (480)961-3846| Mexico City| +52 1 55 45335835
Cincinnati| (908)461-2344| Las Vegas| (480)961-3846| Portland| (503)781-3631| Monterrey| +52 1 55 40840778
Cleveland| (412)600-5632| Los Angeles| (661)713-0121| Pittsburgh| (412)600-5632| Guadalajara| +52 1 55 40949053

Copyright 2022 BRECOlex CO., L.L.C. • BRECO, BRECOFLEX & ATN® are registered trademarks of BRECO Antiebstechnik GmbH • ARC-POWER® is a registered trademark of BRECOdex CO., LL.C, • Kevlar® is a registered trademark of DuPont Patents Pending • ESBAND* is a registered trademark of Max Schlatterer GmbH & Co. KG Patents Pending. Specifications are subject to change without prior notice. All recommendations for the use of the products described herein and all other data or information set forth in this publication, whether concerning such products or otherwise, are furnished without any guarantee, warranty representations, or inducement of any kind whether expressed or implied, including but not limited to warranties of merchantability and fitness for a particular purpose. BRECOVix CO., L.L.C. expressly disclaims liability under any theory, including without limitation, contract negligence, misrepresentation or breach of any obligation relating to the recommendation, data or information set forth by heroin. Readers and customers are encouraged to conduct their own tests before using any product. Read its label and all related instructions. BRECOlex CO., L.L.C, reserves the right to make changes in the technical and dimensional specifications of its products without prior notice. Responsibility for expenses incurred as a result of product changes or discontinuance of a product lies solely with the purchaser.

Contact Us

222 Industrial Way West, Eatontown, NJ 07724 Tel: 732-460-9500 • Fax: 732-542-6725 www.brecoflex.com • email: info@brecoflex.com

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