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Strain gauge purchase

Discussion in 'Datasheets, Manuals and Component Identification' started by oldfart, Jul 24, 2017.

  1. oldfart

    oldfart

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    Jul 24, 2017
    I am a retired mechanical engineer and am interested in making a few projects involving strain gauges. These projects are primarily for personal learning. I have been trying to find a supplier of strain gauges at a reasonable cost. I can find some expensive ones from Digikey and a couple other places and found some cheap ones from AliExpress. The problem with the what I found from AliExpress is I can't find any datasheets about them and all the info is only in Chinese. Can you please help me find a place to buy strain gauges at a reasonable cost?
     
  2. kellys_eye

    kellys_eye

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    Jun 25, 2010
    Personally I'd purchase a few cheap bathroom weigh scales and salvage the strain gauges (and electronics) from them.

    I have one set already (with older LED readout) that I originally intended to re-purpose to weigh propane tanks to indicate content.

    Another one of those 'when I get around to it' projects....
     
    Tha fios agaibh likes this.
  3. oldfart

    oldfart

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    Jul 24, 2017
    Thanks for the tip. My plan was to get some strain gauges and first put them on a simple beam to work out electronics etc. then I want to put some on a more complicated structure to measure strain (stress) at a few locations. Bathroom scales may work for a load cell type set up but I don't think it would help in my case. Anybody know a place to buy plain gauges with or without leads? A rosette would be even better.
     
  4. kellys_eye

    kellys_eye

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    Jun 25, 2010
    RS Components do some basic gauges ranging in price from $10-$20 - not particularly expensive and guaranteed to come with a data sheet. It should provide you with enough information to get started but I don't think sensors more complicated than the 'basic' versions will come 'cheap' no matter where you go for them.
     
  5. Minder

    Minder

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    Apr 24, 2015
    I have bought off ebay for a couple of $$'s also load cells very cheap ($1.50).
    M.
     
  6. kellys_eye

    kellys_eye

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    Jun 25, 2010
    The OP is aware of such but lacks the data sheet information - a common problem with cheap'n'cheerful purchases from China.
     
  7. Minder

    Minder

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    Apr 24, 2015
    Well for a $1.50 not much is lost, for a $s couple more you get an amp attached ebay 182409854910
    There is usually 4 connections, two excitation and 2 output.
    The info is sometimes vague but the same principle is pretty much the same across the board.
    And after a little empirical testing, the general operation comes clear.
    M.
     
  8. oldfart

    oldfart

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    Jul 24, 2017
    Thanks for your help guys... I appreciate it.
     
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