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.
The DM5E Series Ultrasonic Wall Thickness Gage enables you to accomplish a large number of demanding tasks, especially with remaining wall thickness measurements on components subjected to corrosion and erosion.
The actual velocity in these materials may vary significantly due to a variety of causes such as specific composition or microstructure, grain or fiber orientation, porosity, and temperature. This is especially true in the case of cast metals, fiberglass, plastics, and composites. For best accuracy in thickness gaging, the sound velocity in a given test material should always be measured by performing a velocity calibration on a sample of known thickness. Ultrasonic Velocities in Common Materials.