TECHNICAL BULLETIN 9900-9182_00 B3W Belt Tension Information furnished is believed to be accurate and reliable. However, Tol-O-Matic assumes no responsibility for its use or for any errors that may appear in this document. Tol-O-Matic reserves the right to change the design or operation of the equipment described herein and any associated motion products without notice. Information in this document is subject to change without notice. I notice a slight vibration or belt tooth effect in the B3W, what is that? The B3W product family was designed to accommodate the extreme peak forces required by many of today's applications while maintaining repeatable accuracy and high precision. Because of this effort, numerous design changes were implemented in order to create a belt drive product that would ulti- mately provide up to 96% more thrust capacity than Tol-O- Matic's previous belt drive, the B3B One of the changes implemented was belt material. The HTD style belt selected for the B3W application is a polyurethane matrix with steel reinforcing strands. This construction offers increased tensile strength and life at elevated thrust forces. Another change was to the level at which the belt is pre-ten- sioned at time of assembly. The increase in thrust capabilities of the actuator demands a corresponding increase in belt tension. This is necessary to prevent cogging or slippage of the belt with respect to the drive pulley of the actuator. Both of these changes result in an actuator that may exhibit a slight vibration in low speed applications. This condition is most apparent when the carrier is back driven by hand without load on the carrier. This is often described as the feeling of the belt teeth engaging or disengaging with the pulley teeth. This is a normal condition and will not pre- sent an issue in most applications. What can be done if I do not need max thrust and need a lower vibration motion profile? Belt tension can be reduced in an application that does not require the catalog level of thrust capability and a smooth motion profile of the carrier. Below is a chart you can reference to determine the minimum required belt tension based upon the maximum required thrust. The tension values listed in the chart are defined as the amount of force applied to the idle pulley yoke. The actual level of tension being applied to the belt would be half of the value listed if you are measuring true tension of the belt material. If you have additional questions, please contact the technical support group at Tol-O-Matic. Thrust Vs. Belt Tension, B3W 0 50 100 150 200 250 300 350 0 25 50 75 100 125 150 175 200 225 250 275 300 325 350 Max Thrust LBS B3W 10 B3W 15 B3W 20 © 2006 TOL-O-MATIC, INC. TOL-O-MATIC 3800 County Road 116, Hamel, MN 55340 http://www.tolomatic.com • Email: [email protected]

How to tension the belt on a B3W/M3W linear belt drive

Download PDF Report

Upload
tolomatic
View
53
Download
0

Embed Size (px)

Citation preview

Page 1: How to tension the belt on a B3W/M3W linear belt drive

TECHNICAL BULLETIN

9900-9182_00

B3W Belt Tension

Information furnished is believed to be accurate and reliable. However,Tol-O-Matic assumes no responsibility for its use or for any errors thatmay appear in this document. Tol-O-Matic reserves the right to changethe design or operation of the equipment described herein and anyassociated motion products without notice. Information in this docu-ment is subject to change without notice.

I notice a slight vibration or belt tooth effect in the B3W,what is that?The B3W product family was designed to accommodate theextreme peak forces required by many of today's applicationswhile maintaining repeatable accuracy and high precision.Because of this effort, numerous design changes were imple-mented in order to create a belt drive product that would ulti-mately provide up to 96% more thrust capacity than Tol-O-Matic's previous belt drive, the B3B

One of the changes implemented was belt material. The HTDstyle belt selected for the B3W application is a polyurethanematrix with steel reinforcing strands. This construction offersincreased tensile strength and life at elevated thrust forces.Another change was to the level at which the belt is pre-ten-sioned at time of assembly. The increase in thrust capabilitiesof the actuator demands a corresponding increase in belt ten-sion. This is necessary to prevent cogging or slippage of thebelt with respect to the drive pulley of the actuator.

Both of these changes result in an actuator that may exhibit aslight vibration in low speed applications. This condition is

most apparent when the carrier is back driven by handwithout load on the carrier. This is often described as thefeeling of the belt teeth engaging or disengaging with thepulley teeth. This is a normal condition and will not pre-sent an issue in most applications.

What can be done if I do not need max thrust andneed a lower vibration motion profile?Belt tension can be reduced in an application that doesnot require the catalog level of thrust capability and asmooth motion profile of the carrier. Below is a chart youcan reference to determine the minimum required belt ten-sion based upon the maximum required thrust. The ten-sion values listed in the chart are defined as the amount offorce applied to the idle pulley yoke. The actual level oftension being applied to the belt would be half of the valuelisted if you are measuring true tension of the belt material.

If you have additional questions, please contact thetechnical support group at Tol-O-Matic.

Thrust Vs. Belt Tension, B3W

100

150

200

250

300

350

0 25 50 75 100 125 150 175 200 225 250 275 300 325 350

Max ThrustLBS

B3W 10B3W 15B3W 20

TOL-O-MATIC3800 County Road 116, Hamel, MN 55340http://www.tolomatic.com • Email: [email protected]