are purchasing these types of machines so they can sew extra large thread sizes up to Tex 500 or Tex 600 thread sizes. Another option for sewing heavy threads on 301 lockstitch machines is to sew the heavy thread in the bobbin and using a regular size thread in the needle. This means that the seam is inverted when it is sewn.
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The two types of dry film thickness gauges, magnetic type that are commonly used to non-destructively measure dry film thickness are the magnetic pull-off and the magnetic induction instruments. Type 1 or the magnetic pull-off gauge consists of a permanent magnet, a calibrated spring and a graduated scale. To measure the coating thickness, the probe of the magnetic gauge is placed on the coated surface and pulled off. The instrument displays the force required to pull off the gauge off from the coated surface.