Integral Proving Rings
The Proving rings are made of special steel carefully forged
to give maximum strength and machined to give high sensitivity
commensurate with stability ensuring long life and accuracy.
All proving rings are integral type viz, the loading
(outside) bosses are forged integral with the ring body. This
ensures that there is no possibility of abutment shift and
consequent loss of accuracy in reading that always exists with
bolted abutments.
The dial gauge and anvil are mounted on U-brackets
clamped to the ring body by set screw. The dial gauge is fitted
with a special back cover and threaded bush. Which does
not permit any shift from the original dial alignment, coaxial
with the loading boss centres, that is set at the factory before
calibration.
For all compression proving rings and tension
compression proving rings up to and including 5 KN
capacity the loading bosses have female threading ½" BSP
(16 TPI)
The boss faces are ground and polished and are plane
parallel to within 0.2mm total DTI run out. Tension
compression rings have their integral loading bosses male
threaded, 1.25" dia, 8 tpi square thread, 1.25" long. Caps
are provided for use when loading in compression
Repeatability is as stipulated in IS 4169 The rings are
supplied complete with dial gauge and Works
calibration Chart. Individually packed in polished wooden.
Boxes. NCCBM Calibration can also be arranged for any
proving ring at an additional cost. Proving rings to meet
special requirements are also available on request.
Separate polished and ground pair of Loading Pads FOR
Compression Proving Rings and Pair of Shackles for Tension
Proving Rings are provided to suit each proving ring, at extra
cost.