Morehouse UCM - Page 18

Universal Calibrang Machine
(UCM) Manual
(PM-5201)
Morehouse Instrument Company, Inc.
1742 Sixth Ave., York, PA 17403-2675 USA
Phone: (717) 843-0081
www.mhforce.com
Page 18
Rev. 3/2024
Next, as shown in Figure 14, place a hardened alloy steel loading ball (B) of the proper size and load rang in
the ball seat of the reference standard (C) and lower the upper yoke platen (A) unl the ball seat of the platen
rests on the ball.
Figure 13: Proving Ring Adapters
A) Lower Boss of Reference Standard
B) Ring Alignment Bushing
C) Jack Ram
Figure 14:
A) Upper Yoke Platen
B) Hardened Steel Alloy Load Ball
C) Jack Ram Upper Boss of Reference Standard
If the reference standard is not provided with a ball seat, a suitable adapter should be used. Do not confuse a
lathe center, oen found on instruments, with properly machined ball seats.
Note: Do not interchange hardened alloy steel loading balls or retainer clips with hardened alloy steel loading
balls between dierent reference standards. They should be matched with a reference standard and used only
with that standard.
When the reference standard does not have a ball seat, proper axial alignment is dicult to achieve without
the proper accessories and adapters. To maintain proper axial alignment, it is recommended that a reference
standard with a ball and ball cup be used whenever possible.
If the reference standard is a proving ring, an adapter should be used to properly align and secure the refer-
ence standard (Figure 13, A) on the jack ram (Figure 13, C).