Dynatup 8250 User manual

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M14-13655-EN
Operating Instructions
Instron Dynatup
8250 Drop Weight Impact Tester

Electromagnetic Compatibility
Where applicable, this equipment is designed to comply with International
Electromagnetic Compatibility (EMC) standards.
To ensure reproduction of this EMC performance, connect this equipment to a low
impedance ground connection. Typical suitable connections are a ground spike or the
steel frame of a building.
Proprietary Rights Notice
This document and the information that it contains are the property of Instron
Corporation. Rights to duplicate or otherwise copy this document and rights to disclose
the document and the information that it contains to others and the right to use the
information contained therein may be acquired only by written permission signed by a
duly authorized officer of Instron Corporation.
© Copyright 1999 Instron Corporation
Revision A

Preliminary Pages
iii
General Safety PrecautionsGeneral Safety Precautions
Materials testing systems are potentially hazardous.
Materials testing involves inherent hazards from high forces, rapid motions and stored
energy. You must be aware of all moving and operating components which are
potentially hazardous, particularly the moving crosshead or pendulum in an impact
testing system.
Carefully read all relevant manuals and observe all Warnings and Cautions. The term
Warning is used where a hazard may lead to injury or death. The term Caution is used
where a hazard may lead to damage to equipment or to loss of data.
Ensure that the test set-up and the actual test you will be using on materials, assemblies
or structures constitutes no hazard to yourself or others. Make full use of all mechanical
and electronic limits features. These are supplied for your safety to enable you to prevent
movement of the actuator piston or the moving crosshead beyond desired regions of
operation.
The following pages detail various general warnings that you must heed at all times while
using materials testing equipment. You will find more specific Warnings and Cautions in
the text whenever a potential hazard exists.
Your best safety precautions are to gain a thorough understanding of the equipment by
reading your instruction manuals and to always use good judgment.

Preliminary Pages M14-13655-EN
iv
Warning
Disconnect the electrical power supply before removing the covers to
electrical equipment.
Disconnect equipment from the electrical power supply before removing any electrical
safety covers or replacing fuses. Do not reconnect the power source while the covers are
removed. Refit covers as soon as possible.
Disconnect power supplies before removing the covers to rotating
machinery.
Disconnect equipment from all power supplies before removing any cover that gives
access to rotating machinery. Do not reconnect any power supply while the covers are
removed unless you are specifically instructed to do so in the manual. If the equipment
needs to be operated to perform maintenance tasks with the covers removed, ensure that
all loose clothing, long hair, etc. is tied back. Refit covers as soon as possible.
Shut off the supply of compressed gas and discharge residual gas
pressure before you disconnect any compressed gas coupling.
Do not release gas connections without first disconnecting the gas supply and discharging
any residual pressure to zero.
Use protective shields or screens if any possibility exists of a hazard
from the failure of a specimen, assembly or structure under test.
Use protective shields whenever a risk of injury to operators and observers exists from
the failure of a test specimen, assembly or structure, particularly where explosive
disintegration may occur. Due to the wide range of specimen materials, assemblies or
structures that may be tested, any hazard resulting from the failure of a test specimen,
assembly or structure is entirely the responsibility of the owner and the user of the
equipment.
Protect electrical cables from damage and inadvertent disconnection.
Protect all electrical cables, particularly transducer cables, from damage. Never route
cables across the floor without protection, nor suspend cables overhead under excessive
strain. Use padding to avoid chafing where cables are routed around corners or through
wall openings.
Wear protective clothing when handling equipment at extremes of
temperature.
Materials testing is often carried out at non-ambient temperatures using ovens, furnaces
or cryogenic chambers. Extreme temperature means an operating temperature exceeding
60 °C (140 °F) or below 0 °C (32 °F). You must use protective clothing, such as gloves,
when handling equipment at these temperatures. Display a warning notice concerning
low or high temperature operation whenever temperature control equipment is in use.
You should note that the hazard from extreme temperature can extend beyond the
immediate area of the test.

Preliminary Pages
v
Warning
Take care when installing or removing a specimen, assembly or
structure.
Installation or removal of a specimen, assembly or structure involves working inside the
hazard area between the grips or fixtures. Keep clear of clamping devices and pinch
points at all times. Keep clear of the hazard area between the grips or fixtures during
crosshead or pendulum movement.
Keep clear of the operating envelope of a robotic device unless the
device is de-activated.
The robot in an automated testing system presents a hazard because its movements are
hard to predict. The robot can go instantly from a waiting state to high speed operation in
several axes of motion. During system operation, keep away from the operating envelope
of the robot. De-activate the robot before entering the envelope for any purpose, such as
reloading the specimen magazine.

Preliminary Pages M14-13655-EN
vi
WarningWarning
At no time should the machine be operated with any of the safety devicesAt no time should the machine be operated with any of the safety devices
by-passed or malfunctioning.by-passed or malfunctioning.
1. Keep entire body, especially hands, arms and head out of the path of the falling
weight and tup at all times.
2. Only one operator should operate the machine at any given time.
3. Install the safety "H" bar supplied to ensure weight cannot drop whenever weight is
raised and work is being done on system. The safety "H" bar clips to the guide
columns.
4. Perform regular maintenance.
5. Never use the 50 lb. (22.7 kg) or heavier weight set when operating at velocities
above 14.5 ft/s (4.42 m/s).
6. Do not leave tools, spare parts or debris inside the safety enclosure when operating
the impact machine.
7. Do not handle the guide columns. They are easily soiled, which can seriously effect
impact test results.
8. Do not strike non-deformable objects with instrumented tups. If the tup strikes the T-
grooved baseplate, specimen support fixture or a non-deformable specimen, the tup
will likely be damaged.
9. Frequently check the crosshead weight retainer knobs or screws for tightness. They
should be securely tightened before performing impact tests. If these bolts are loose,
the crosshead can bind on the guide columns.
10. Always unplug the power cord when servicing or repairing the Model 8250.
11. Frequently check the hoist cable for damage.
12. When the optional pneumatic assist is installed, frequently check that the large
springs used to accelerate the crosshead are securely screwed to the rods that hold
them.
13. Always use the shock absorbers when pneumatically assisting the crosshead.
14. To prevent potential damage to the crosshead, make sure that the shock set installed
matches the weight set attached to the crosshead. This can be quickly verified by
matching the background color on the sticker attached to the shock with the color
coded dot located on the weight plates.

Preliminary Pages
vii
Table of Contents
ChapterChapter PagePage
Introduction 1-1
Introduction.......................................................................................................................1-2
About this Manual .............................................................................................................1-4
Product Support.................................................................................................................1-5
Installed Safety Features....................................................................................................1-6
Specifications 2-1
Specifications....................................................................................................................2-2
Technical Data Sheets.......................................................................................................2-3
Energy and Velocity Tables...............................................................................................2-5
Installation 3-1
Preparing the Site..............................................................................................................3-2
Uncrating the Machine .....................................................................................................3-4
Securing the Model 8250 in Place....................................................................................3-5
Connecting Utilities and Initial Set-up................................................................................3-6
Installing Specimen Support Fixtures .................................................................................3-8
Installing the Tup................................................................................................................3-9
Initial Machine Operation and Checkout .......................................................................3-10
Function of Controls 4-1
Control Pendent ................................................................................................................4-2
Ancillary Machine Controls ...............................................................................................4-4
Preparation for Use 5-1
Adjusting the Velocity Detector .........................................................................................5-2
Adjusting the Stop Blocks and Shock Absorbers................................................................5-4
Installing the Crosshead Weights.......................................................................................5-6
Operation 6-1
Performing a Test...............................................................................................................6-2

Preliminary Pages M14-13655-EN
viii
Maintenance and Troubleshooting 7-1
Scheduled Maintenance ..................................................................................................7-2
Troubleshooting.................................................................................................................7-5
Glossary

Preliminary Pages
ix
List of Figures
FigureFigure PagePage
Figure 1-1. Dynatup 8250 Drop Tower........................................................................ 1-3
Figure 3-1. Foundation Layout.................................................................................... 3-2
Figure 3-2. Uncrating .................................................................................................. 3-4
Figure 3-3. Motor Enclosure ........................................................................................ 3-7
Figure 4-1. Control Pendent........................................................................................ 4-2
Figure 4-1. Motor Enclosure ........................................................................................ 4-4
Figure 5-1. Velocity Detector Flag .............................................................................. 5-2
Figure 5-2. Velocity Detector and Flag ...................................................................... 5-3
Figure 5-3. Shock Absorber and Stop Block Setup ..................................................... 5-4
Figure 5-3. Installing the Add-on Weights .................................................................. 5-6
Figure 7-1. Lubrication Points...................................................................................... 7-4
Figure 7-2. Hoist Hub and Pinch Roller Assembly........................................................ 7-6

Preliminary Pages M14-13655-EN
x

1-1
Introduction
Chapter 1
Introduction
Outline
•Introduction.....................................................................................................1-2
•About this Manual...........................................................................................1-4
•Product Support ..............................................................................................1-5
•Installed Safety Features..................................................................................1-6

Introduction M14-13655-EN
1-2
Introduction
The Model 8250 drop weight impact test machine is used to test the impact
characteristics of an extensive variety of materials and components over a wide range of
impact velocities. Data from these tests can then be used in the evaluation of material or
component performance.
The Model 8250 drop weight impact test machine consists of the frame, two guide
columns, hoist motor, drop-weight mechanism, control pendant, and accessories. Various
weights are available, providing the ability to reach many impact energy ranges. A tup
secured to the lower crosshead provides the load data for the attached data acquisition
system. A photo-detector/flag system provides velocity information.
Figure 1-1shows the Dynatup 8250 Drop Tower.
Data Acquisition
Data can be acquired with the Instron Dynatup Model 930-I data acquisition system or
other general-purpose data systems. The data acquisition software runs on a personal
computer connected to the Model 8250. Test parameters, test setup information, test
results and statistics are available from the software program. Further information on data
systems can be obtained from Instron Dynatup.
Modes of Operation
The Model 8250 operates in either manual or automatic modes, and can be supplied with
an optional pneumatically assisted crosshead for high impact velocities.
Fixturing is available to conduct tests on manufactured specimens (Izod, Charpy),
components, sheet specimens (plaques, discs, film) and extruded structural shapes (pipes,
channels), to the following standards, as well as to numerous non-standard specifications:
•ASTM D-3763, Plastic Sheet Penetration
•ASTM E-23, Charpy and Izod
•ASTM D-256, Charpy and Izod
•BOEING BMS-256, Composites Penetration/Damage
•NASA ST-1, Composites Damage
•ASTM D-2444, Plastic Pipe
•BOEING 7260, Composites Damage
•MCDONNELL DOUGLAS MDC-J1938A

Introduction
1-3
Introduction
Figure 1-1. Dynatup 8250 Drop Tower
Specimens up to six inches wide (15.24 cm) are tested above the upper baseplate and
between the guide columns. Larger specimens are tested below the upper baseplate of
the machine.

About this Manual M14-13655-EN
1-4
About this Manual
This manual provides a basic understanding of the 8250 machine and its operation. It
contains specifications, installation instructions, descriptions of the machine controls,
information for preparation and use, and basic maintenance and troubleshooting
information.

Product Support
1-5
Introduction
Product Support
If you encounter problems with your machine, or to order accessories or replacement
parts, contact Instron service using the information below:
•In the United States: 1-800-473-7838
•In Canada: 1-800-461-9123
•In all other regions: contact your nearest Instron Office.

Installed Safety Features M14-13655-EN
1-6
Installed Safety Features
Several features have been incorporated into the Model 8250 to insure operator safety.
Read this section carefully before installing or using your machine.
•Each door is made of tempered safety glass, letting you view the tests without the
danger of flying debris or specimens. The doors have safety interlocks to prevent
machine operation when any of the doors are open.
•The latch hook is designed to positively engage the crosshead. The more weight or
force applied to the hook, the more it closes.
•In the pneumatic mode, a steel rod, called a shear pin, holds the latch and crosshead
assemblies in a fixed position against compressed springs. The safety system ensures
the shear pin is correctly seated before operation.
•In the event of a power loss or a loss of air pressure, the system automatically shuts
down. Air pressure is monitored at all times. The system can not operate if pressure
falls below 20 psi (140 kPa).
•A cable tension switch and hoist height-limiting switch ensures correct operation of
the latch assembly.
•Overpressure relief valves prevent accidental damage to the machine if excessive air
pressure is applied.

2-1
Specifications
Chapter 2Chapter 2
Specifications
Outline
•Specifications..................................................................................................2-2
•Technical Data Sheets .....................................................................................2-3
•Energy and Velociy Table...............................................................................2-5

Specifications M14-13655-EN
2-2
Specifications
Impact Velocity:
Gravity
(GRAV) mode 2.0 to 12.7 ft/sec
(1,440 to 9,144 in/min;
.61 to 3.87 m/sec;
3,658 to 23,225 cm/min)
Pneumatic (PNEU) mode 12.7 to 44 ft/sec
(9,144 to 3l,680 in/min;
3.87 to 13.41 m/s
23,225 to 80,467 cm/min)
Drop Weight: 5.5, 10, 25, 50, 75, 100 lbs.
(2.5, 4.5, 11.3, 22.7, 34.0, 45.3kg)
Impact Energy:
Gravity (GRAV) mode 0.5 to 223 ft-lb. (.67 to 302 Joules)
Pneumatic (PNEU) mode 14.0 to 326 ft-lb. (19.0 to 442 Joules)
Overall Dimensions:
Height 107.06 inches (272cm)
Width 23.0 inches (58.4cm)
Depth 29.3 inches (74.4cm)
Power Requirements:
Standard 120V, 60 Hz, 15 AMPS
Optional 220V-240V, 60 Hz, 10 AMPS
220V-240V, 50 Hz, 10 AMPS
100V, 50 Hz, 20 AMPS
Air Requirements:
Pressure 85-95 psi (585 - 650 kPa)
Flow 1.0 SCFM (28 L/min at atmospheric
pressure)

Technical Data Sheets
2-3
Specifications
Technical Data Sheets
Model 8250HV
Dimension Description English
(inches) Metric (cm)
AOverall Height 107 272
BTotal Width 23 58.5
CMax. Component Width 19 48
DMax. Component Height 22 56
EDepth of Drop Tower 20 51
FDepth of Motor Assembly 9.5 24
GMax. Vertical Drop Height 46* 117*
HInner Guide Rod Clearance 6 15
IMax. Component Depth 14 35.5
* Values dependent upon specimen tup selection and specimen thickness.
Overall system weight: 1300 lbs (588 kg)
Power requirement: 100V – 240V, @ 50-60 Hz, 20 Amps
Air requirement: 0.3 cfm (8.5 lpm) @ 90 psi (6.21 bars)

Technical Data Sheets M14-13655-EN
2-4
Model 8250NP
Dimension Description English
(inches) Metric (cm)
AOverall Height 107 272
BTotal Width 23 58.5
CMax. Component Width 19 48
DMax. Component Height 22 56
EDepth of Drop Tower 20 51
FDepth of Motor Assembly 9.5 24
GVertical Drop Height 46* 117*
HInner Guide Rod Clearance 6 15
IMax. Component Depth 14 35.5
* Values dependent upon specimen tup selection and specimen thickness.
Overall system weight: 1300 lbs (588 kg)
Power requirement: 100V – 240V, @ 50-60 Hz, 20 Amps
Air requirement: 0.3 cfm (8.5 lpm) @ 90 psi (6.21 bars)