By: Wayne Meulendyk
These Variable Screw Thread Measurement Systems have several more specific designations: Tri-roll Gage; Bi-Point Gauge; Segment Gage.
Tri-Roll Gauge is usually used for external screw threads. Using a Tri-Roll Gage for internal screw threads is only an option for larger diameter screw threads. It is valuable because the three points of contact are self-positioning on the thread, which makes it an easy test to make. The Rolls of a Tri-Roll Gauge have different functions and forms depending on its function.
Bi-Point Gage is often used on internal screw threads. There are a couple of brands which also use the Bi-Point system on external screw threads. When used on internal screw threads the Bi-Point Gauge is self-positioning. When used on external screw threads the gage measurement must be noted on the hi-point, the largest diameter, which may take a little more skill than if it were self-positioning.
Variable Screw Thread Measurement Systems are ideal in a couple of situations.
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