Connecting Thermocouples to a Spinning Workpiece: Tips and Tricks

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Discussion Overview

The discussion revolves around the challenges of connecting thermocouples to a spinning workpiece for temperature measurement during metal cutting. Participants explore various methods and considerations related to the application, including the size of the workpiece and the feasibility of using bearings.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Experimental/applied

Main Points Raised

  • One participant inquires about the method to connect a wire to a spinning workpiece.
  • Another participant suggests considering the size of the application, cost, efficiency, and the possibility of relaying current through the turning machine.
  • There are suggestions to connect the wire through a bearing that does not move with the workpiece, with caution about torque and lubrication to prevent wire breakage.
  • A participant expresses a specific interest in using the Tool-Work Thermocouple method for measuring temperature while cutting steel and seeks advice on the placement of bearings on a workpiece of approximately 20 to 25mm in size.
  • Some participants argue against using a bearing due to the small size of the application, suggesting that it may not be suitable.
  • There are recommendations to research different types of thermocouples that may be more appropriate for the application.
  • One participant shares a link for further understanding of thermocouples and their connection methods.
  • Concerns are raised about the difficulty of connecting wires to the workpiece while it is turning at specific speeds or feed rates.

Areas of Agreement / Disagreement

Participants express differing views on the use of bearings for the application, with some suggesting it is not feasible due to the size constraints. There is no consensus on the best method for connecting the thermocouple to the spinning workpiece, and the discussion remains unresolved.

Contextual Notes

Participants mention various factors such as the size of the workpiece, the need for lubrication, and the specific application of measuring temperature during metal cutting, which may influence the proposed solutions.

Who May Find This Useful

This discussion may be useful for individuals involved in machining, temperature measurement in manufacturing processes, or those interested in thermocouple applications in dynamic environments.

soonsoon88
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How to connect a wire to a workpiece which is spinning by turning machine ?
 
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What's the size of the application?

Other things to think about are cost, efficiency, time you're willing to commit, etc.

How about connecting the wire to your turning machine, which you could then relay the current through the turning machine.

You could also connect the wire through a bearing that is connected to the workpiece such that the wire doesn't move with your workpiece. You would have to be careful of how much torque the bearing would apply to the wire. In other words, make sure you lubricate in order to avoid breaking of the wire. Lubrication will decrease the amount of stress that is applied to the wire.
 
Last edited:
mpaige1 said:
What's the size of the application?

You could also connect the wire through a bearing that is connected to the workpiece such that the wire doesn't move with your workpiece. You would have to be careful of how much torque the bearing would apply to the wire. In other words, make sure you lubricate in order to avoid breaking of the wire. Lubrication will decrease the amount of stress that is applied to the wire.

Thanks for reply. I only can connect the wire to the workpiece. Actually i want using Tool-Work Thermocouple method to measure the temperature when cutting steel. I search all the youtube, i can't find any similar thing in it. so, i am getting trouble. May i know when the bearing should put at ? on workpiece ? the size of workpiece just around 20 to 25mm..
I really need help =(
 
so you probably shouldn't use a bearing for that application. It's just way too small to use a bearing. The only other application I can think of is the one I mentioned before. I'll try to get a better understanding of the thermocouple you mentioned before and see if I can figure something out.
 
are you trying to find the temperature on the work piece? If so, you probably should research more thermocouples to find one that best fits your application. I don't know a lot about thermocouples. Also try posting this in the EE part as thermocouples are usually connected to a pc for readouts. Good luck and sorry I couldn't be of more help.
 
mpaige1 said:
so you probably shouldn't use a bearing for that application. It's just way too small to use a bearing. The only other application I can think of is the one I mentioned before. I'll try to get a better understanding of the thermocouple you mentioned before and see if I can figure something out.

http://www.mfg.mtu.edu/marc/primers/heat/exp.html

You may have a look on that link.
I am using tool work thermocouple(a way of measure temperature when metal cutting)
 
mpaige1 said:
are you trying to find the temperature on the work piece? If so, you probably should research more thermocouples to find one that best fits your application. I don't know a lot about thermocouples. Also try posting this in the EE part as thermocouples are usually connected to a pc for readouts. Good luck and sorry I couldn't be of more help.

I need to measure the temperature of workpiece when it is turning on certain speed or feedrate.
I got the idea how to connect wire to insert but just having a problem of connecting another wire to workpiece. The link i gave you just now is showing how they connect. but it troublesome for me. so, i need someone to help me think of another way >.<
 

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