Centerless Grindning
Trinel performs the method of centerless grinding called Thru-Feed. The part, bar or tube, passes in between the grinding and regulating wheels supported by a work rest guide. This produces a product that is round and straight.

Alloys, Stainless, Copper and Plastics

  • Bar and tube capabilities up to 100 feet in length.
  • Diameters from 1/16" to 11 1/2" in diameter.
  • Tolerances held to .0004 limit.
  • Micro finishes to 10 rms.
  • Small orders or truckloads.
  • Sizes and Tolerances to your specification



Trinel can polish in three different ways:

  1. Polishing (burnishing), when we use a roll straightener on turned product to enhance surface quality.
  2. Belt Sander (picture above), used on larger diameters to size and finish turned, ground and polished bars.
  3. Cork Wheel Diameters to provide customers with desired finishes. Using grinding machines, to produce finishes for chrome plate and turned, ground and polished bars..


  • Bar and tube up to 100 feet in length
  • Diameters from 1/16" to 12" diameters
  • Tolerances held to .0005 limit
  • Micro finishes to 8 rms 

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