Glastonbury Southern Gage Tri-Roll Thread Comparator Variable Thread Gages

Name: Willrich Precision Instrument Company, Inc
Address: 80 Broadway, Cresskill, NJ, 07626, United States
Telephone: 866-945-5742
Price range: $$

Glastonbury Southern Gage Tri-Rolls and Components variable thread gages are made of five components that comprise a complete Tri-Roll system. These units consist of five components
1. Bases & Accessories
2. Frames
3. Dial Indicator
4. Stop Adjusting Tool
5. Gaging Rolls – Inch

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

Call or email sizes for pricing Ph 866-945-5742 / email: [email protected]

Glastonbury Southern Gage Tri-Roll Thread Comparator

Variable Thread Gage System
Economical: Reduced gaging time compared to Go/NoGo gages
Precision: Rigid construction and constant gage pressure guarantee consistent and precise readings
Qualitative Readings: The Tri-Roll not only indicates whether a threaded part is within assigned limits, it also shows the exact position of the pitch diameter within a tolerance range. In addition, the Tri-Roll gages will check size and out of roundness of plain cylindrical parts
Repeatability: 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.
Easy to Set: No adjustment required on the lower rolls means that no adjustment is required when changing from one thread size to another.

Types of Thread Rolls Available

Full Profile-Functional Diameter Size Full ribbed rolls for functional sizes coarser than 48 T.P.I (For 48 T.P.I and finer the ribs locate on alternate threads)
Cone & Vee Single Element Pitch Diameter Two ribs ("vee type") on lower rolls One rib ("cone type") on upper roll Flank contact limited
"Best Wire" Size Radius Single Element Pitch Diameter Single ribs only with "Best Wire" size radius for any given pitch (T.P.I Plain Rolls Thread Major Diameter and

Plain Cylindrical Parts. Straight cylindrical rolls for checking diameter and out of roundness.

Minor Diameter (55° included angle) Two full profile "vee" rollsand one full profile cone roll
Lead/Flank Angle Two full profile "vee" rolls (1 and 3) with outside flanks relieved. and one full profile cone roll

SYSTEM 21
System 21 provides for interchangeable assembly with respect to functional size only. Functional size must be measured at the maximum material limit within the length of standard gaging elements. The characteristic known as NO GO functional diameter must also be verified. This can be accomplished by using fixed limit gaging or variable gaging with functional elements.

SYSTEM 21A (FOR METRIC THREADS IN ACCORDANCE WITH ANSI B1.18M)
System 21A provides for interchangeable assembly with functional size verified at the maximum material limit using standard length gaging elements. This can be accomplished using fixed limit gaging or variable gaging with functional elements. System 21A also states that the minimum material limit (minimum pitch diameter) must be verified by inspecting two thread flank locations over the length of the thread. This can be accomplished by using variable gaging or thread roll snap gages with pitch diameter elements.

SYSTEM 22
System 22 provides for the interchangeable assembly with functional size verified at the maximum material limit using standard length gaging elements. This can be accomplished using fixed limit gaging or variable gaging with functional diameter elements. System 22 also states that the minimum material limit (minimum pitch diameter) must be verified over the full length of the thread. This can be accomplished using variable gaging with pitch diameter elements.

SYSTEM 23
System 23 provides for interchangeable assembly with functional size verified at the maximum material limit using standard length gaging elements and minimum material limit (minimum pitch diameter) must be verified over the full length of the thread. The gaging requirements for SYSTEM 22 would also apply here but in SYSTEM 23 other thread characteristics such as lead, flank angles, taper and roundness must have to be independently verified. Only thread characteristics, which are specified, will have to be inspected for SYSTEM 23 compliance.

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