GT2 Belt Tensiometer

thingiverse

This is a GT2 Belt Tensiometer The theory says that belt constructors give a force in Newton for the correct tension of the belt. This is the force needed to displace the belt by 1/64 of the inch for each inch of belt length between two points. According to that we can measure the force to displace a belt of length 13cm for 2mm and this force should be equal to what the constructor gives for good tension. The tool can be used to calculate this force (assuming you have calibrated it) or can be used to compare the tension of two belts. To assemble the tool you can use 2 springs that you can get from a Pilot Gt2 pen. I use 2 springs as this way the results are more readable. To measure you attach the belt in the bow and press the handle until bottom reaches center of gauge. When you release the 'pointer' must have been move and the distance shows the force. The bigger the distance the bigger the force. You can calibrate the tool with a scale and have a good estimation of the real force in kg. There are two plungers, one has a mark each 2mm. You can replace the 'pointer' with a rubber o-ring. Note the o-ring should move relatively free. You can use the tool alone for any other belt that has a tension in the limits of the tool. What i have not found yet is the proper force /tension for a Gt2 belt.