Hello All! I have one machine. The disc (Horizontal place) is rotating and connecting to the shaft which is connecting to gear box and ac motor. I would like to k now the torque of rotating disc for some interval such as 10s, 20s, 30s, to take reading , but I do not have money to buy torque meter. I would like to know can I use tachometer to take the rotation speed of rotating disc within interval, 10s per taking. And then I can use T= I x aplha to find the different time's torque reading Please advise me. Or could you please give me another ideas or suggestions? Thanks a lot.