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  1. marktheyeti

    Torque sensor drift during continuous measurement and data logging

    Feedback from analysis: Static bench testing did not show this drift. Electrical evaluation did not clearly identify a source of the problem. It "sounded rough" to the technician - it made noise while rotating. This I knew. Not all that helpful. I've started soliciting quotes for replacement.
  2. marktheyeti

    Torque sensor drift during continuous measurement and data logging

    Mike, The sensor is not near it's limit. It's a 30,000 lb-in sensor measuring a load of less than 5,000 lb-in. The alignment between the shaft being measured and the shaft of the sensor is not perfect, but I've employed a gear coupling between the two to transmit the load. The magnitude of...
  3. marktheyeti

    CMM Sphere Qualification

    Our CMM is checked daily against a two-sphere wishbone artifact. The check consists of measuring the spheres with each tip on the stylus in several different index positions of the head. Not EVERY position of course, just a few of the common ones in order to check for gross error. If the...
  4. marktheyeti

    CMM Sphere Qualification

    The level of qualification and/or "checking" required will depend upon usage and accuracy requirements. If you're taking measurements requiring accuracy near the limits of your machine (or at least bordering on the gage-accuracy-10x-required rule of thumb) then frequent qualification doesn't...
  5. marktheyeti

    Torque sensor drift during continuous measurement and data logging

    MintJulep, Thank you, that makes a great deal of sense. I will see what I can do to test this theory, and then I'll post my results. Doug, The output sensor is measuring torque applied to the output shaft of a worm gear speed reducer. I am also monitoring the input shaft torque (and motor...
  6. marktheyeti

    Torque sensor drift during continuous measurement and data logging

    3DDave, Your suggestion was appreciated and well-received. My response was not meant to dismiss it but to continue the conversation by providing more information relevant to your suggestion. If I've missed the point here, please explain. Thanks.
  7. marktheyeti

    Design Wormgear to support a certain load

    From the American Gear Manufacturers Association, standard ANSI/AGMA 6034-B92 defines a rating procedure. 6022-C93 defines a design procedure. (ISO, DIN, and other organizations also provide such standards.) The process can be rather complicated, with many factors, including duty cycle...
  8. marktheyeti

    Torque sensor drift during continuous measurement and data logging

    CompositePro, I will try to evaluate individual components as best I can. I will review your information on slip-rings, thank you. MintJulep, yes the sensor was unused for an extended period. 3DDave, I did first consider temperature effects, but that seems unlikely because the sensor almost...
  9. marktheyeti

    Torque sensor drift during continuous measurement and data logging

    The original manufacturer, BLH Electronics, appears to be out of business. My next step is to contact an alternative manufacturer and ask for an evaluation.
  10. marktheyeti

    Torque sensor drift during continuous measurement and data logging

    Hello, I'm dealing with what appears to be a torque sensor malfunction that I have not seen before. Using a rotary torque sensor to measure applied load to a rotating shaft (180 rpm), I have recorded a very consistent, gradual increase in the measured value over a period of several days. I...

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