How to log tapping torque?
How to log tapping torque?
(OP)
I work for a machining company. I am currently involved with a project to evaluate cutting fluids. This is in response to problems we have had with tapping. We would like to conduct a test of the lubricity of the various fluids by monitoring torque during tapping. I was hoping to use some sort of data logger to monitor torque during the tests. I understand that torque is generally monitored by watching the current drawn by the spindle motor. Then I would have to use a torque vs. current graph to relate the current back to torque. I have seen a few current dataloggers around that might be able to do this.
Do I need a datalogger for each phase? If so, how do I re-integrate these separate values for an overall torque value?
I also welcome any other comments on convenient ways to get this data.
Do I need a datalogger for each phase? If so, how do I re-integrate these separate values for an overall torque value?
I also welcome any other comments on convenient ways to get this data.





RE: How to log tapping torque?
RE: How to log tapping torque?
I am using a Cinncinati 5-axis CNC machine. The problem is that I want to do a lot of test holes. The machine provides no option for logging data. Also, the indication is via a simulated meter on one of the screens in the control. The lag and the inaccuracy of visually recording the max value makes it seem pretty futile to glean useful information from the meter.
Why do I feel like I am re-inventing the wheel here? Hasn't anyone else needed to do this? We tried bringing in Emuge (tap manf.), but they refused to weigh-in on coolant issues.
RE: How to log tapping torque?
http://www.mcrts.com/Standard%20MC900.htm
Alternatively, you could get a rotary torque transducer (http://www.rstechltd.com) and then use simple recorder products from National Instruments or Vishay and have to do more data manipulation (transfer from recorder to computer, use Excel or something else to convert signal voltages to torque, etc.).
Regards,
Cory
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: How to log tapping torque?
Depending on you application and machine setup there may not ba linear relationship between 3 phase motor current and torque.
Make sure you understand how you machine is set up. To make sure you get a accurate answer use the direct measurement from a torque gauge or if possible stick a strain gauge some where on the machine or test specimen and measure the strain.