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Gage Galling

Galling can cause a thread gage to grow.

Galling is when small amounts of the material being tested weld to the gage surface thus causing the gage to grow. There are some materials, like stainless steel and aluminum, that are more prone to galling gages. Small amounts of material can be transferred from:

ABRASION
Several conditions may increase abrasion.

  • Product thread manufactured too close to the maximum material size. When this happens there is more gage to material contact as the gage is applied. To avoid this try to keep the product size near the mean.
  • No oil on the gage. Be sure that the gage is well lubricated. By lubricated I mean oiled. I know that the part is covered in cutting oil. While cutting oil is a cutting lubricant, it is not a gage lubricant. A gage needs real oil. The thickness of the oil will not effect the measurement ability of the gage. The oil will just move out of the way, yet it will protect the surface of the gage from galling
  • A fat thread will frequently cause the GO gage to fail the thread. A marginally fat thread will be again close to the maximum material condition and thus cause abrasion against the gage. A fat thread is caused by too fast of a feed at the start of the thread making process. The speed or feed causes either the work piece to move away from the cutting tool, or the cutting tool to flex away from the work piece, as the cut is begun. This condition needs to be guarded against to avoid galling of the gage.
  • A fine pitch, larger diameter thread is a recipe for abrasion of the thread gage. The more threads per inch the more revolutions the gage makes to gain full engagement and thus a longer contact distance for friction along the helical path of the thread.
  • CHIPS
    The machining process may leave material chips in the threaded hole. If these chips are not removed they may weld themselves to the gage surface or get caught in the root of the gage thread. The fix for this is simply to remove the chips. OK, it is not always simple to remove them but it must be done to extend the life of the gage.

    BURRS
    These are pieces of material still attached to the work piece but protruding into the machined space left after cutting the thread. Not removed they may weld themselves to the gage surface. If burrs are a problem a different style cutting tool, a second pass with the cutting tool, different speeds or feeds or just a wire brushing may solve the problem.

    COMMENTS:
    Original Posted: 2/28/2008
    Last Revised: 9/21/2011
    Refer comments/corrections to gageguy@gagecrib.com.

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