If the span was 32 inches the deflection amount would be 3264 inches or. Care has been taken by the authors, pruftechnik ltd, in the preparation of this publication. When tensioning an array of vbelts, use a single belt toward the center. Ensure that the tightening sequences and all procedures and application documents have been approved. Drive belt tensioner, service and repair, procedures. Conversely, too much tension puts excess strain on belts, bearings, and shafts, and causes premature wear of these components. Pdf design of belttensioner systems for dynamic stability. It is advisable to tighten the nuts down as much as possible by hand so as to avoid slackness in the joint assembly, as it will take longer to tension the bolts using the tools.
Remove the tensionfinder from the belt before operation. Improper belt tension is the primary cause of premature belt failure and increased costs. The following is the recommended procedure for running these belts. The belts positive grip eliminates the need for high initial tension. Timing belt tensioning treadclimber in case the tension on the timing belts is too loose or tight, please follow these instructions. Proper tension is essential for maximum belt life and efficiency.
If proper installation procedures are followed, generally a synchronous belt should not require periodic tension adjustments. That way, belt timing will not change when the tensioner removes belt slack. Confusion to maintenance staff on tensioning procedures mechanisms that are difficult to access or adjust all of the issues listed previously could easily lead to conveyor belt shutdown, which often forces machine and production downtime something that obviously needs to be avoided in todays busy, 247 production facilities. Apply force at right angles to the center of the span see diagram below. Position large oring on the tester scale at this measured length.
This guide provides information for the implementation of good pulley alignment of beltdriven equipment including terminology, alignment methods as well as belt maintenance, storage and tensioning. Read off the setting force value indi for single belt drives a s cated by the top edge of the upper marker ring. Authorized distributor for more information on tensioning gauges. Ventilation as all vbelt drives generate heat, the heat needs to be dissipated through the ventilated sides, and possibly bottom, of the drive guard. The highest quality belts still lose nearly 50% of installed tension, while lower quality belts lose over 70% of installed tension. Pulley alignment guide precision alignment is an essential part of a proactive reliability program. The belt sander also offers an important advantage over disc sanders. Correction be sure to use proper length belt and move tensioning all the way in when installing belt. Deflecting the belt midspan to predetermined distance and confirming proper deflection force.
Measure the vibration frequency of the belt using the btm. A mathematical model of the belttensioner system, and numerical solution methods, are utilized to develop a computeraided design procedure. Force10 range of topside bolt tensioning tools consist of 10 base tools covering bolt sizes from 34 to 4 m20 to m100. Mptab7i2007r 20 calculation of vbelt tensions and shaft loads mechanical power transmission association 5672 strand court, suite 2, naples, fl 34110. The belt should be pulled tight between the cam and crank on the water pump side. A xuse a 6mm allen key to increase tension on the rear roller until the until the second tensioning mark aligns with the back edge of the deck fig. Using a hex k ey, turn toothed belt tensioning roller 1 clockwise 8 mm in dir ection of arrow until tensioning le ver2compresses tensioning element 3 sufficiently to enable special tool t 400 11 to be fitted in drilling and in plunger. Belt sander the belt sander is extremely useful for doing many different sanding jobs.
Belt tensioning methods for small package conveyor. Rolling causes low belt tension resulting in low belt life due to slip and heat build up. Using these methods you can quickly, easily and accurately measure the belt tension and identify if adjustments need to be made. This will ensure that the locking screw cannot come loose. The intent is to find this proper range for any vbelt drive. A practical guide to pulley alignment plant services. Wearing gloves, work around the belts, checking for cracks, frayed spots, cuts, or unusual wear patterns. Browning belt tensioning instructionsform 8082 absolutaire. Place the large end of the tester on one belt, at the center of the span.
Most v belt problems are due toimproper tensioning. After seating the belts in the groove and adjusting center distance so as to take up slack in the belts, further increase the tension until only a slight bow on the slack side is apparent while the drive is operating under load. All vbelt drives must operate under proper tension to produce the wedging action of the belt against the groove sidewall. Most vehicles that come with a vbelt also comes with an adjustable belt tensioner. Turn off power to the motor and follow lock out, tag out procedures. Belt installation belt storage and installation 5 handling the roll of conveyor belt 5 stringing the belt 6 tensioning the belt 7 takeup travel and initial position 8 cutting the belt to length 9 iii. Tension load the distance in inches between the axes of the driver and driven shafts. The belt tensioning gauge reads turn the drive belt tension bolt. Belt tensioning instructions timing belt htb, standard and metric timing belts should be installed to fit pulleys snugly, neither too tight nor too loose. Vbelt tensioning adjustment can be made using a tensionmeter or other type spring scale, using the following procedure. Fabric splice preparation preparation of work area 10 splice tools 11 direction of splice and bias. Belt tension checker tensioning vbelt drives with a browning tension checker general rules of tensioning. Belt tensioning when installing the belt on the cam, crank, and water pump. There are two general procedures for determining proper belt tension.
Installing the belt can be accomplished many different ways. See page 4 of this pdf for a side view illustration of the tensioner and accessory belt routing. Slide the small oring flush with the barrel of the tester. The belt should also be protected from contact with chemicals, grease or oil. When the exact weight of the belt is not known, use average estimated belt weight see table 61 w m weight of material, lbs per foot of belt length. Apply a sufficient force to tester to deflect the belt such that the large oring is flush with the other belts. V belt tensioning 37 v belt deflection force values 39 topical index 40 important safety information 41 guidelines presented in this manual are suggestions to help properly install and maintain belts. Tools required phillips screw driver 6mm allen wrench 1. Installation storage 1 handling 1 installation 2 stringing the belt 5 tensioning 5 training the belt 7 factors affecting the training of a belt 8. Ideal tension is the lowest tension at which the belt will not slip under peak load conditions. It will produce a smooth surface on a board in less time and with less work than hand sanding.
All v belt drives must operate under proper tension to produce the wedging action of the belt against the groove sidewall. The belt should have no more than a 12 inch of slack to be properly tensioned. Procedures for calculating belt tension are included in each of the appropriate gates drive design manuals. Correct vbelt tensioning is the single most important factor necessary for long, satisfactory operation.
Smallest sheave diameter range new belt belt type rpm range used belt 8vt 12. Check tension frequently during the first 24 hours of operation. Prying a belt damages cables in the belt, leading to early belt failure. Three multiplying factors, k t, k x, and k y, are used in calculations of three of the components of the effective belt tension, t. Belt tensioning instructions engineering information. Cause failure constant slippage caused by insufficient tension in belt. Belt tensioning methods for small package conveyor dorner. The above method of tensioning belt drives is to be used when a drive has been selected in accordance with t he suggestions listed in the drive selection. Remove all shrouds underneath the treadles to gain free access to the cable system.
Belt life varies greatly depending on not only how the belt is installed, but on how the belt is tensioned at installation. The belt tensioning device has been modified during production, tensioner version may vary from one vehicle to. This setting is typically higher than used belts, to allow for a rapid stretch in the fabric cover, and this caus. Never apply belt dressing as this will damage the belt and cause early failure. At the center of the span length apply a force f, perpendicular to the belt span, large enough to deflect the belt 164 inch for every 1 inch of belt span, q. When a belt is installed with a snug but not overly tight fit, longer belt life, less bearing wear and more quiet. If there is no specification, then the following guide to belt tension may be applied. Tensioning or aligning the running belt tensioning the running belt. K y is a multiplying factor used in calculating these belt tensioning forces. Check the tension of the belt by pushing inward on the belt with your hands.
Belt tension checker 5 0 1 0 0 1 5 0 s p a n i n c h e s 0 5 10 15 20 25 30 5 0 10 1 5 0 s p a n i n c h e s 0 5 1 0 5 2 0 2 5 3 0 belt span tensioning vbelt drives with a powerdrive tension checker belt tension checker powerdrive instruction sheet read and follow all instructions carefully. Proper belt tension is a critical step when installing a belt. Installation, operation and maintenance manual doc. Tension the belt until the scribe line from step 4 is displayed in the designated slot of the tensionfinder as determined in step 7. Vbelt replacement work instructions a publication by skf power transmission. Adjust the belt as needed from the adjustment bolt until the slack in the belt is no more than a 12 inch. If you can feel a slipping sensation when running on the treadmill, the running belt must be tightened. Mark or note a point on the belt, or on one of the belts in a multiple vbelt drive. Apply force at right angles to the center of the span. All belts do not feel the same when properly tensioned due to different materials and tension cables used in their manufacturing processes. Position bottom of the large oring on the span scale at the measured belt span. In most cases, the belt has stretched from use, causing the belt to slip. Vbelt tensioning 37 vbelt deflection force values 39 topical index 40 important safety information 41 guidelines presented in this manual are suggestions to help properly install and maintain belts.
If the span was 32 inches the deflection amount would be 3264 inches or 12 inch. Other means of applying force must be used if force requirement is greater than this. Keep belts free from foreign material which may cause slip. Here are some procedures and best practices that may ease use or help increase the reliability of your belt tensioning efforts. Inspect the area of the vbelt in need of tensioning and locate the adjustable belt tensioner.
Place the belt tension indicator on top of the belt at the centre of span, and apply a force at right angles to the belt, deflecting it to the point where the lower marker ring is level with the top of an adjacent belt. Force10 tensioners are designed to fit on to most ansi b16. Place the tension checker squarely on one belt at the center of the belt span. Industrial vbelt drives service manual drive engineer. Scope this standard covers two sheave locked center drives using classical and narrow industrial vbelts and sheaves covered under arpm ip20, ip22, and ip23. Forcedeflection and sonic testing meters are 2 ways to correct this. Incorrect belt tension methods quickly deteriorate the reliability and efficiency of pulley belt driven systems. The browning belt tension checker, shown at left, is ideal for this procedure. The methods of storing and handling conveyor belting and the procedures for tensioning it before making the final splice are just. Proper service and repair procedures are vital to the safe, reliable operation of all motor vehicles as well as the personal safety of those performing the repairs. Mptab7i2007r 20 calculation of v belt tensions and shaft loads mechanical power transmission association 5672 strand court, suite 2, naples, fl 34110. Belt tension is the single most important factor in ensuring long life of v belts, pulleys and supporting bearings. Technical procedure star trac fitness 1 of 3 6371521 rev. Quick guidelines for determining belt tension on standard vee.
Quick guidelines for determining belt tension on standard. Wearing gloves, work around the belt s, checking for cracks, frayed spots, cuts, or unusual wear patterns. Undertensioned belts lead to slippage, overheating, rollover and noise, all of which lead to higher maintenance costs and inefficient transmission of power. Tighten the mounting bolt to the engine accessory with the ratchet and socket. Making light work of belt tensioning machine design. The following sections outline installation procedures that will ensure maximum life and. A technical bulletin for engineers, contractors and students in the. A wellestablished rule of thumb is that the best tension for a vbelt drive is the least tension at which the drive will not slip under peak load.
Complete enclosure of the drive belt system should be mandatory the guard should limit any entry or access in all directions. It is not intended as a comprehensive guide to alignment of process machinery, nor is it a substitute for seeking professional advice or. Measure the belt span length and calculate the desired deflection distance 164 per inch of span length using a spring scale, press down on the belt in the approximate center of the span, and deflect the belt to the desired level. For tensioning results in units of force, follow the procedures defined in section 5. On new installations, hand rotate the system at least one full revolution of the belt in order to seat and normalize the components. When you install belts at optimal tension, you save time and money. Belt tensioning instructions jason industrial, inc. Standard safety procedures and precautions including use of safety goggles and proper tools. Check the tension at least twice during the first day. Technical procedure core health and fitness page 2of 2 6374439 rev. Inser t special tool t 400 11, r elease toothed belt tensioning r oller.
Timing belt tensioning tool r this tutorial is provided as a courtesy by ecs tuning. Observing signs of unusual belt wear or damage will help troubleshoot possible drive problems. Sbd belt tensioning procedure stage 7 1 2 5 4 3 no. Standard safety procedures and precautions including use of safety goggles and proper tools and equipment should be. When a belt is installed with a snug but not overly. It is not intended as a comprehensive guide to alignment of process machinery, nor is it a substitute for seeking professional advice or reference to the manufacturers of the machinery. A timing belt tensioning treadclimber in case the tension on the timing belts is too loose or tight, please follow these instructions. Download vbelt tension checker instruction sheet powerdrive llc. Belt conveyors for bulk materials fifth edition chapter 6. Belt tensioning when installing the belt on the cam, crank, and water pump sprockets, make sure all of the belt slack is on the tensioner side. If not, the engine accessory that the belt operates must be loosened from the engine to tension the belt. V belt tensioning adjustment can be made using a tensionmeter or other type spring scale, using the following procedure. Cause of failure cut bottom and sidewall indicate belt was pried over sheave and damaged during installation.
Important note if detensioning, refer to section 7, studbolt detensioning procedure. Proper installation, maintenance and operation procedures must be observed. Iomm ver 3 page 6 of 8 the location in the storage premises should be selected so as to avoid heat and direct sunlight. Wedge tlp vbelt tensioning tables synchronous belt tensioning tables deflection forces for belt tensioning lbs. For example, the maximizerpro drive analysis program gives tensioning targets in hz as well as in force units newtons and poundsforce. Check tension frequently during the first 2448 hours of runin operation. The belt s positive grip eliminates the need for high initial tension. Mark or note a point on the belt, or on one of the belts in a multiple v belt drive. Industrial vbelt drives service manual carlisle belts.
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