Tri-Roll Thread Comparator Systems provide variable thread measurement as well as indicating whether a threaded part is within the specified limits. Rigid construction and constant gage pressure assure consistent and precise readings Both the Tri-Roll and ITC thread comparators are able to inspect a wide range of parts with a single frame.
Thread Check, Inc. offers an extensive range of Tri Roll Thread Comparators. Tri Roll Thread Comparators provide actual thread measurements of dimensional characteristics for quicker machine adjustments during thread production. The Tri Roll System measures the exact position of the pitch diameter within the tolerance range. It also checks size and out of roundness of plain cylindrical parts. The Tri Roll reduces gaging time over thread ring gages. One single gage can be used to inspect pre-plate, after- plate, class 1, 1A, 2, 2A, 3, and 3A eliminating the need for multiple fixed limit thread ring gages. The rigid construction and constant measuring pressure of our tri-roll thread comparators provide consistent and accurate readings. Fixed mounting of the lower rolls assures a solid support for the work piece. Only the upper roll actuates the indicator thereby providing repeatable readings. The instrument is easy to set as no adjustment of the lower rolls is required when changing from one thread size to another. The variable gaging system provides longer life of the tooling and thus reduces costs. Thread Check’s Tri Roll Thread Comparators comply with system 21, system 21A, and system 22. Click here for Tri Roll Thread Comparator Instructions.
Thread Check, Inc. offers the ITC - Internal Thread Comparators to provide actual thread measurement of dimensional characteristics for quicker machine adjustments and reduced gaging time over thread plug gages. One single gage can be used to check pre-plate, after-plate, class 2, 2B, 3, and 3B eliminating the need for multiple fixed limit thread plug gages. A single frame covers a size range from #10 through 2 ½ in diameter. Larger frames are available up to 8.0". The rigid construction and constant measuring pressure of our ITC comparators provide consistent and accurate readings. Thread Check’s Internal Thread Comparators comply with system 21, system 21A, and system 22. Click here for Internal Thread Comparator Instructions.
Class "W" Full Form Master Setting Plugs gages are used to set Tri Roll Thread Comparators. Master Thread Setting plugs are manufactured to a go basic pitch diameter size. PITCH DIAMETER is the theoretical diametrical plane which passes through a thread at the point where the width of the thread tooth and groove are equal. The pitch diameter is measured by means of the universally recognized three wire method.
Class W tolerance master setting ring gages are used to set ITC - Internal Thread Comparators. Class W tolerance master setting ring gages are manufactured to a go basic functional diameter. FUNCTIONAL DIAMETER is the actual (measured) pitch diameter of a thread adjusted by the cumulative effects of lead error and angle error, which is always added to external threads and subtracted from internal threads.