Morehouse UCM Guide

ISO/IEC 17025 / ANSI/NCSLI Z540.3 Accredited
Morehouse Instrument Company, Inc.
1742 Sixth Ave., York, PA 17403-2675 USA
P: [phone]
F: [phone]
[e-mail]
www.mhforce.com
PM-5201
Rev. 11/2021
Operation and Instruction Manual
Universal Calibrating Machine (UCM)

Universal Calibrang Machine
(UCM) Manual
(PM-5201)
Morehouse Instrument Company, Inc.
1742 Sixth Ave., York, PA 17403-2675 USA
Phone: [phone]
www.mhforce.com
Page 2
Rev. 11/2021
Table of Contents
1.Introducon
1.1 Origin and Use ...........................................................................4
1.2 Funconal Operaon......................................................................4
1.3 Design ..................................................................................5
1.4 Reference Standard .......................................................................5
1.5 Overview ...............................................................................6
2. Descripon
2.1 General .................................................................................7
2.2 Construcon.............................................................................7
2.3 Hydraulic Jack Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.4 Loading Power Supply .....................................................................9
3. Preparaon for Use
3.1 Unpacking..............................................................................13
3.2 Installaon .............................................................................13
3.3 Installaon of a Reference Standard ........................................................14
3.4 Preparing the Hand Pump for Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.5 Preparing the Jack Assembly for Use ........................................................16
4. Operaon
4.1 Operang Condions ....................................................................17
4.2 Compression Setup ......................................................................18
4.3 Tension Setup...........................................................................21
4.4 Hand Pump Operaon....................................................................23
4.5 Universal Hydraulic Pump .................................................................24
4.6 Calibraon .............................................................................24
4.7 Tare Load ..............................................................................25
5. Service, Inspecon, Maintenance, & Lubricaon
5.1 Tools ..................................................................................27
5.2 Service Inspecon .......................................................................27
5.3 Maintenance ...........................................................................27
5.4 Lubricaon .............................................................................28
5.5 Rust Prevenon .........................................................................28

Universal Calibrang Machine
(UCM) Manual
(PM-5201)
Morehouse Instrument Company, Inc.
1742 Sixth Ave., York, PA 17403-2675 USA
Phone: [phone]
www.mhforce.com
Page 3
Rev. 11/2021
Table of Contents
6. Disassembly, Repair, and Reassembly
6.1 Disassembly and Reassembly ..............................................................29
6.2 Air Bleed Procedure for Hydraulic Jack ......................................................29
6.3 Service Instrucons for Hydraulic Hand Pump ................................................30
6.4 Repair .................................................................................30
6.5 Drawings & Parts Lists ....................................................................31
7. Accessories & Adapters for use with Morehouse Universal Calibrang Machines......................34

Universal Calibrang Machine
(UCM) Manual
(PM-5201)
Morehouse Instrument Company, Inc.
1742 Sixth Ave., York, PA 17403-2675 USA
Phone: [phone]
www.mhforce.com
Page 4
Rev. 11/2021
1. Introducon
1.1 Origin and Use
Morehouse Universal Calibrang Machines were originally developed to make use of the inherent high accura-
cy of Morehouse Proving Rings to calibrate working load cells. Today, calibrang machines are used extensively
in industrial, government, and military laboratories not only for the calibraon of load cells, but for calibrang
force transducers, dynamometers, load rings, force links, and other force measurement devices.
1.2 Funconal Operaon
The Morehouse Universal Calibrang Machine is a device for simultaneously applying a force to a high accu-
racy calibraon reference standard, and the device to be calibrated (unit under test). The force is produced by
a hydraulic jack acvated by a manually operated pump, specially designed to perform precise and accurate
calibraon work. The calibrang machine is used to calibrate compression type and tension type instruments.
The calibraon reference standard is always loaded in compression, even when calibrang an instrument in
tension.
Figure 1: Morehouse Universal Calibrating Machine 1,000,000 lbf Capacity

Universal Calibrang Machine
(UCM) Manual
(PM-5201)
Morehouse Instrument Company, Inc.
1742 Sixth Ave., York, PA 17403-2675 USA
Phone: [phone]
www.mhforce.com
Page 5
Rev. 11/2021
1.3 Design
The design of the machine has one purpose, ulmate accuracy. The force produced by the calibrang machine
is transferred directly to the unit under test without any machine loss or mechanical interference. Fricon
between the reference standard and the unit under test has been eliminated. This is essenal because even
slight fricon, which is inherent in other types of calibrang machines, frequently results in gross inaccuracies.
Non-axial loading, another factor contribung to inaccurate calibraon, is also eliminated by the design of the
machine and its accessories.
1.4 Reference Standard
While a reference standard, such as a load cell, is essenal to the funcon of calibraon, it is not supplied as
part of the Universal Calibrang Machine. Only compression reference standards need to be purchased for use
with the machine because whether performing a tension or compression calibraon, the reference standard
is always loaded in compression. Since compression reference standards are less expensive than dual mode
tension and compression type standards, the cost of reference standards for use with a Morehouse Universal
Calibrang Machines is less than for other types of machines.
Figure 2: Morehouse Ultra-Precision Load Cell