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Label thickness gauge

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  • #30148

    John Metz
    Participant

    To All:
    Does anyone know of a gauge that will pass a m.s.a to measure label thickness?

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    #78247

    James A
    Participant

    John,
    I think so, yes.  There is a manufacturer who produces various gauging and measurements sytems – one of which was designed to measure thickness (using either laser or light from memory – i.e. non-contact).  I think it was designed to measure paint thickness originally.
    By using a label or labels of known thickness (i.e. master parts) then an msa could be done – I believe the resolution was pretty good on the system I read about.
    All the usual disclaimers apply – I don’t work for them, promote their product for reward, or have any connection with them, but try a search on the web for Keyence – it might help.
    James A

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    #78248

    TM
    Member

    Is the label thickness critical?  If it is not critical accept with a COC from the supplier.
    If it is critical try a light contact CMM.  Zero the CMM on a ground piece of steel around the label and take a Z axis measurement on the label.  Use the largest probe you have on the CMM to reduce the deformation caused by the probe.  If this does not work, try mounting the steel on its edge and measureing the thickness aroung the label and on the label.  The probe will be more sensative measuring sideways due to the torque created by the arm of the probe.
    A .00005″ dial indicator may work with an experience metrologist

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    #78249

    Marc Richardson
    Participant

    A less expensive alternative is a device known as a snap gage, snap mics, thickness gage or speed mics. It is a spring-loaded device with a quick release trigger. They come with different throat and anvil sizes depending on your application. They also have different amounts of pressure which is exerted on the piece being measured, usually measured in grams. The consistent pressure applied by the spring is the key to consistent measurements and acceptable MSA. Try Starrett, Mitutoyo or Fowler. 
    Marc Richardson
    Sr. Quality Assurance Engineer

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    #78267

    Carl H
    Participant

    I have some experience with thin materials (0.0003-0.008 inch) metrology.
    Contact methods can be tricky as stated.  Pressure, contact tip area, deformation, surface contaminants and alignment have been problems.  Difficult to find “master” parts at these thicknesses.
    If average thickness is critical, consider weighing a known area of hte label and backing out ave thickness based on material density.  Balances may be more precise (in grams) than direct thickness measures (in mils).
    Some advances made in non contact capacitance gages recently (more stable).  These seem to allow for precise/repeatable measurements with spots/line sizes down to ~1/8 inch.  Good if your material has constant dielectric strength.
    I look forward to other responses.  I am always on look out for good thickness measures.
    Regards,  Carl
     

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