a) Ensure the setting plug is the correct size and class.

b) Lubricate the setting master plug with a thin film of light viscosity oil before inserting into the ring gage.

c) Turn the ring onto the setting plug 1 1/2 to 2 threads at the front. If ring will not go onto setting plug go to operation 2 “Setting Ring”. There should be some resistance or drag even at this short engagement. To test for taper or bellmouth, place the ring on its face on a workbench and test for shake or looseness with the setting plug, being very careful not to damage the end threads.

d) Turn ring further onto the truncated section, remembering the feel at the 1 1/2 to 2 thread engagement. The drag should remain approximately the same although it may be slightly greater at full engagement due to more flank contact.

e) Remove the ring from the setting plug and repeat operations c & d on the opposite side of the thread ring gage.

f) The fit should be approximately the same on both sides of the ring to insure proper straightness. Remember if a setting plug is manufactured or worn smaller at the front, it will falsely indicate taper or bellmouth in the ring gage. Setting plugs must be reasonably straight.

g) Turn the ring gage from the truncated section onto the full form section at the back. The drag should be approximately the same on both sections which insures good flank angle contact.

h) If at this point nothing is found which indicates a problem skip to sealing the gage.

2) SETTING RING

a) Turn the locking screw counter-clockwise until it is loosened.

b) Turn the adjusting screw clockwise, this will open the ring to a larger pitch diameter than the setting plug.

c) Turn the ring gage onto the setting plug truncated section so that approximately one thread of setting plug extends beyond the ring. (This will promote uniform wear over the entire thread length of the setting plug.)

d) If it has not already been done, turn the locking screw counter-clockwise until it is loosened. Turn the adjusting screw counterclockwise to tighten or clockwise to loosen until there is a slight drag between the ring and the setting plug.

e) Turn the locking screw clockwise until tight. This locks the adjusting screw so that the size of the ring gage remains fixed. There should be noticeable drag between the ring and setting plug. NOTE: Operations c to e may need to be repeated more than once to obtain the proper drag or feel.

f) Turn the ring gage from the truncated section onto the full form section at the back. The drag should be approximately the same on both sections which insures good flank angle contact.