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Helical Offset or Lock Washer Effect

Helical Offset or Lock Washer Effect

The Lock Washer Effect may occur when the AGD Adjustable-Style Thread Ring Gage Locking Mechanism is loosened.

When an AGD Adjustable-Style Thread Ring Gage is threaded it is a solid ring without adjustment slots. After the AGD Adjustable-Style Thread Ring Gage is hardened and threaded, the adjustment slots are cut into the AGD Adjustable-Style Thread Ring Gage and the locking mechanism is installed. The AGD Adjustable-Style Thread Ring Gage is then finished lapped and set to a Threaded Master Setting Gage.

When the steel is hardened, the modules are trapped in stasis. When the steel is machined the molecules relax and as they relax they cause movement in the work piece. When the workpiece is a ring, like a thread ring gage, and a slot is cut clean through from the outside diameter to the inside diameter there will be movement of the steel. The movement may be very minor and not even visible to the unassisted eye, but in the case of gages, movement of 0.0005" (0.0127mm) is considered significant.

The movement will manifest itself in one or two of three ways:
1. The slot will be wider than the cut width. The ring has sprung open.
2. The slot will be narrower than the cut width. The ring has sprung closed.
3. The slot will have a helical offset. This is the lock washer effect.

With the locking mechanism in place all of these deformations are forced back to their original, pre-slotted condition by the process of setting the AGD Adjustable-Style Thread Ring Gage to a Threaded Master Setting Gage. If the locking mechanism is loosened, the AGD Adjustable-Style Thread Ring Gage has the tendency to spring back to its deformed state. Any time the locking mechanism is loosened, the AGD Adjustable-Style Thread Ring Gage needs to be re-set on the appropriate Threaded Master Setting Gage and again locked into place.

Some of the known reasons for AGD Adjustable-Style Thread Ring Gages to go out of calibration:
1. Wear: This is the #1 reason.
2. Mis-handling: Dropping; Using as hockey puck; Throwing against wall; Make-up your own here.
3. Exposure to temperature extremes: Frozen in hold of an airplane or heated by sitting in a hot truck.
4. Faulty locking mechanisms which allow the threaded ring gage to mis-adjust for no visible reason. This is very rare.

Conclusions:

1. Whenever you use AGD Adjustable-Style Thread Ring Gages it is advisable to have a Threaded Master Setting Gage available to verify the AGD Adjustable-Style Thread Ring Gage has not gone out of tolerance.
2. Whenever you adjust an AGD Adjustable-Style Thread Ring Gage, the adjustment must be accomplished with a Threaded Master Setting Gage.

Other related pages:
Using Truncated Setting Plug Gages.
Adjusting Thread Ring Gage Locking Device.
Ring Gage Calibration by Direct Measurement.
Procedures for Setting Thread Ring Gages with Truncated Setting Plug Gages

COMMENTS
This data current as of July 2008
Last Revision: 9/24/2015
Refer comments/corrections to gageguy@gagecrib.com.

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