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 standa*aging 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 locati* 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 roundnes*ust h*e to be independently verified. Only thread characteristics, which are specified, will h*e to be inspected for SYSTEM 23 compliance. |
STC Comparator
Precision
Ball slide c*truction and c*tant gaging pressure assure precise re*g through linear tr*el of the ball slide. Definitive Helical path seating and 60% peripheral contact provide functional size *ition within the pitch diameter tolerance assigned. Gaging Range Single frame covers a size range of #10 through 3/4". Versatile Segments are easily changed with *itive mounting pin alignment. Economical Reduced gaging time compared to Go/NoGo gages . |
ITC Comparator
Precision
Rigid c*truction and c*tant gaging pressure assure precise re*gs. Definitive The ITC gage reads the actual size of the pitch diameter showing its *ition in relatio*the pitch diameter tolerance assigned. Gaging Range Single frame covers a size range of #10 through 2 1/2" , Larger frames are *ailable up to 8" Versatile The *itive alignment feature of the frame allows segments to be easily changed with *itive mounting pin alignment. Economical Reduced gaging time compared to Go/NoGo gages . |
Tri-Roll System
Zero System Variable Gages are *ailable for external and internal thread applicati*. The external thread application are covered by the segment and Tri-Roll gage units and the internal applicati* by the ITC unit.
Precision
Rigid c*truction and c*tant gage pressure guarantee c*istent and precise re*gs.
Qualitative Re*gs
The Tri-Roll not only indicates whether a threaded part is within assigned limits, it also shows the exact *ition 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 re*gs. Easy to Set No adjustme*equired on the lower roll*eans that no adjustment is required when changing from one thread size to another. Wide Gaging Range Both the ITC and the Tri-Roll are able to inspect a wide range of parts with a single frame. Adaptability The variable thread system can be used to measure plain diameters and can be used with the "Zero Spindle" gage system. Economical with Long Work Life The variable thread gage system provides longer life of the tooling and thus reduces cost. |
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Full Profile-Functional Diameter Size
Full ri*ed 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 (1 and 3) One rib ("cone type") on upper roll (2) Flank contact limited |
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"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. |
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Minor Diameter
(55° included angle) Two full profile "vee" rolls (1 and 3) and one full profile cone roll (2) |
Lead/Flank Angle
Two full profile "vee" rolls (1 and 3) with outside flanks relieved. and one full profile cone roll (2) |
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