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T–8 SECTION 4    DRIVE COMPARATIVE STUDIES The development of the PowerGrip GT2 belt has produced an impressive range of enhanced properties and subsequent design opportunities for engineers. Comparative  studies,  shown  in  Figures  7  through  10,  allow  designers  to  make  quantitative assessments and to highlight the most significant improvements and design opportunities.  Particularly significant points from the comparative studies follow: 4.1    Durability The greatly increased durability of the PowerGrip GT2 design has resulted in power capacities far above those quoted for similar size belts of previous designs.  The resulting small drive packages will increase design flexibility, space utilization and cost effectiveness. 4.2    Tooth Jump Resistance The very significant improvement in tooth jump resistance of PowerGrip GT2 when compared to similar belts has several important advantages. 1.    Ratcheting resistance during high start-up torques. 2.    Reduced bearing loads, particularly in fixed-center drives.  Lower average tensions can be used without encountering tooth jump at the low tension end of the tolerance ranges. 3.    Reduced  system  losses  result  from  lower  pre-tensioning,  with  less  potential  for  tooth jumping. Test Stopped –––3 Fig. 7    Comparison of Performance Ratios for Various Belts Fig. 8    Comparison of Tooth Jump Torques for Various Belts 3 mm HTD Versus 3 mm PowerGrip GT2 3 mm HTD 3 mm GT2 TEST CONDITIONS:  Speed = 6000 rpm Power = 1.00 lbin/mm width Pulleys: Driver = 20 grooves Driven = 20 grooves Test Stopped –––3 5 mm HTD Versus 5 mm PowerGrip GT2 5 mm HTD 5mm GT2 TEST CONDITIONS:  Speed = 2300 rpm Power = 3.35 lbin/mm width Pulleys: Driver = 20 grooves Driven = 20 grooves 200 150 100 50 0 200 150 100 50 0 10 8 6 4 2 0 1 2 3 4 5 2 mm GT2 MXL 2 mm PowerGrip GT2 Versus MXL 3 mm PowerGrip GT2 Versus 3 mm HTD 5 mm PowerGrip GT2 Versus 5 mm HTD 5 mm GT2 5 mm HTD 3 mm GT2 3 mm HTD 60 50 40 30 20 10 0 450 375 300 225 150 75 0 2 4 6 8 10 15 30 45 60 75 Installed Tension (lb) TEST CONDITIONS: Speed = 1130 rpm Belt Width = 4.8 mm Pulleys: Driver = 20 grooves Driven = 20 grooves Installed Tension (lb) TEST CONDITIONS: Speed = 750 rpm Belt Width = 6 mm Pulleys: Driver = 30 grooves Driven = 30 grooves Installed Tension (lb) TEST CONDITIONS: Speed = 2300 rpm Belt Width = 15 mm Pulleys: Driver = 20 grooves Driven = 20 grooves