Home Page T-9 4.3    Noise The smoother meshing action of the PowerGrip GT belt, with its optimized design, produces significantly lower noise levels when compared with other similar sized belt types operating under similar  speeds  and  tensions.    These  improvements  are  enhanced  by  the  fact  that  narrower  belts can be used due to increased power capacities. Fig. 9    Comparison of Noise Levels for Various Belts Fig. 10    Comparison of Positioning Errors of Various Belts 2 mm GT MXL APPLICATION:  Motion Transfer Belt: No. of teeth = 126 Width = 8 mm Pulleys: Driver = 12 grooves Driven = 40 grooves Installed tension = 1.8 lb Motor = 200 steps/cycle 3 mm GT 3 mm HTD .003 .002 .001 0 APPLICATION:  Motion Transfer Belt: No. of teeth = 92 Width = 6 mm Pulleys: Driver = 20 grooves Driven = 20 grooves Installed tension = 6.6 lb Motor = 200 steps/cycle .030 .020 .010 0 4.4    Positioning Accuracy The  PowerGrip  HTD  belt  tooth  forms  were  primarily  designed  to  transmit  high  torque  loads. This requirement increased tooth to groove clearances which resulted in increased backlash when compared with the original trapezoidal designs. PowerGrip  GT  has  reversed  this  problem  with  power  capacities  now  exceeding  those  of PowerGrip  HTD  while  giving  equivalent  or  higher  levels  of  positional  accuracy  than  trapezoidal timing belts. 3 mm HTD 3 mm GT 5 mm HTD 5 mm GT 110 100 90 80 70 60 50 40 110 100 90 80 70 60 50 40 3 mm PowerGrip GT Versus 3 mm HTD 5 mm PowerGrip GT Versus 5 mm HTD Belt: No. of teeth = 188 Width = 15 mm Pulleys: Driver = 26 grooves Driven = 26 grooves Microphone  location  midway  between the pulleys, 100 mm from the belt edge. Belt: No. of teeth = 118 Width = 30 mm Pulleys: Driver = 20 grooves Driven = 20 grooves Microphone  location  midway  between the pulleys, 100 mm from the belt edge. 1000 1500 2000 2500 3000 3500 4000 4500 Speed (rpm) 1000 1500 2000 2500 3000 3500 4000 4500 Speed (rpm)