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Installing the Crosshead Weights

 

M14-13655-EN

5-6

Installing the Crosshead Weights

Each standard Model 8250 impact test machine is equipped with the following weight
sets:

1 set

5.5 lbs. (2.5kg)

l set

10.0 lbs. (4.5kg)

1 set

25.0 lbs. (11.3kg)

1 set

50.0 lbs. (22.7kg)

2 sets

25.0 lbs. (11.3kg) (with dowel pins)

The exact mass of each crosshead configuration is labeled on each weight set.

The following sections provide information on installing weights. Refer to Figure 5-3 for
an illustration of installing the add-on weights.

Figure  5-3. Installing the Add-on Weights

Содержание 8250

Страница 1: ... M14 13655 EN Operating Instructions Instron Dynatup 8250 Drop Weight Impact Tester ...

Страница 2: ...d 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...

Страница 3: ...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 opera...

Страница 4: ... 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 t...

Страница 5: ...he 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 operatin...

Страница 6: ...n 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 th...

Страница 7: ...ring 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 S...

Страница 8: ...Preliminary Pages M14 13655 EN viii Maintenance and Troubleshooting 7 1 Scheduled Maintenance 7 2 Troubleshooting 7 5 Glossary ...

Страница 9: ... 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 ...

Страница 10: ...Preliminary Pages M14 13655 EN x ...

Страница 11: ...1 1 Introduction Chapter 1 Introduction Outline Introduction 1 2 About this Manual 1 4 Product Support 1 5 Installed Safety Features 1 6 ...

Страница 12: ...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...

Страница 13: ...roduction 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 ...

Страница 14: ...s 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 ...

Страница 15: ...ou 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 ...

Страница 16: ...shead 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 monit...

Страница 17: ...2 1 Specifications Chapter 2 Chapter 2 Specifications Outline Specifications 2 2 Technical Data Sheets 2 3 Energy and Velociy Table 2 5 ...

Страница 18: ... 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 Requir...

Страница 19: ... 19 48 D Max Component Height 22 56 E Depth of Drop Tower 20 51 F Depth of Motor Assembly 9 5 24 G Max Vertical Drop Height 46 117 H Inner Guide Rod Clearance 6 15 I Max 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 ...

Страница 20: ...ax Component Height 22 56 E Depth of Drop Tower 20 51 F Depth of Motor Assembly 9 5 24 G Vertical Drop Height 46 117 H Inner Guide Rod Clearance 6 15 I Max 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 ...

Страница 21: ...165 5 224 425 576 75 34 0 40 102 14 6 4 4 20 5 6 2 248 336 489 663 100 45 4 40 102 14 6 4 4 19 7 6 331 448 602 816 All values are approximate and based on using model 8902 tup Values will change depending upon tup selection test geometry and specimen thickness Contact Instron Dynatup for values pertaining to other testing specifications Available specimen support fixtures for specifications ASTM D...

Страница 22: ...4 4 331 448 All values are approximate and based on using model 8902 tup Values will change depending upon tup selection test geometry and specimen thickness Contact Instron Dynatup for values pertaining to other testing specifications Available specimen support fixtures for specifications ASTM D 3763 ASTM E 23 ASTM D 256 Charpy ASTM D 256 IZOD Boeing BMS 256 Composites Penetration Damage Fixture ...

Страница 23: ...tline 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 ...

Страница 24: ... 80cm clearance between the rear studs and any wall or obstructions and 18 inches 45cm between the studs and any obstructions to the side Figure 3 1 illustrates proper machine placement Figure 3 1 Foundation Layout For correct operation and reliable results the machine must be level and mounted directly to the foundation Do not use any rubber pads shims or vibration isolators between the machine a...

Страница 25: ...pe thread fitting and a barbed fitting are provided for connecting the air supply The electrical power required is dependent on the specification given at the time of the order Available configurations are 120Vac 60Hz 15A 100Vac 50Hz 20A 220Vac 50Hz 10A 220Vac 60Hz 10A If you are unsure of the configuration either contact Instron Dynatup or remove the back panel to the rear motor enclosure to expo...

Страница 26: ...e Use only the machine frame for tilting and lifting and lifting 1 Remove the top and side panels of the crate and the plastic sheeting covering the machine 2 Move the pallet with the Model 8250 still banded in place as close to the final position as possible Once uncrated the machine is difficult to move 3 Lift the Model 8250 and slide the base off the end of the crate Lifting the base of the mac...

Страница 27: ...rning Install the H bar to prevent the crosshead from falling before working Install the H bar to prevent the crosshead from falling before working within the safety enclosure within the safety enclosure The model 8250 is supplied with a safety H bar for the protection of the user The H bar clips to the guide columns and prevents the crosshead from falling Use caution when working in or around the...

Страница 28: ... depress the metal tabs and push the assembly over the connectors You can hear an audible click when the fittings lock in place 5 Route the cables that connect the tup and detector to the Dynatup data system under the back panel of the safety enclosure Refer to the section on Tup Installation 6 Connect the short 3 ft 1m tup lead to the long 20 ft 6 5m tup cable and secure the connectors in place w...

Страница 29: ...Connecting Utilities and Initial Set up 3 7 Installation Figure 3 3 Motor Enclosure ...

Страница 30: ...bers 4 If the fixture is a pneumatic clamp route the control hose under the back safety enclosure door and connect it to the fittings on the side of the rear motor enclosure Refer to the section on Utility Connections and Initial Set up Also make sure that the crosshead and tup do not touch the raised clamp plate when the crosshead is on the stop blocks or shock absorber snubbers T groove Baseplat...

Страница 31: ...using the 1 2 13 inch 1 2 inch screw 13 threads to the inch socket head cap screw The 15 kN 3 5 Kip tup Product No 8730 should have the 5 pin connector facing the rear safety enclosure door All other tups should have the connector facing the right guide column b Connect the short 3 ft 1m tup cable to the tup Attach the Amphenol connector round 5 pin connector of the long 20 ft 6 5m tup cable to th...

Страница 32: ...atch until the crosshead is engaged by the hook e Raise and lower the latch crosshead Verify that the crosshead and tup cannot touch the specimen support fixtures Also check that the stop blocks are the same height f Raise the latch crosshead to the top position g Press the ARM button Then without releasing the ARM button press the FIRE button until the hook opens and the crosshead is released If ...

Страница 33: ...on until the weight drops There may be a delay of 5 seconds e Release the two buttons If a pneumatic clamp is installed the system will go through a stripping sequence and then the latch assembly will automatically lower engage the crosshead and raise to the position of the height limit magnet mounted on the height scale f Repeat the gravity drop several times and check that the crosshead hand kno...

Страница 34: ...Initial Machine Operation and Checkout M14 13655 EN 3 12 ...

Страница 35: ...4 1 Function of Controls Chapter 4 Chapter 4 Function of Controls Outline Control Pendent 4 2 Ancillary Machine Controls 4 4 ...

Страница 36: ...that control the operation of the pneumatic clamping fixture if installed The crosshead control section contains the manual controls for crosshead positioning The pendent is shown in Figure 4 1 The following sections describe each section Figure 4 1 Control Pendent Mode Section Auto manual AUTO MAN SWITCH The manual mode lets you directly control all functions of the Model 8250 and the pneumatic c...

Страница 37: ...d for manual stripping of specimens and removing debris from the center bore of the pneumatic clamp Crosshead Control Section Up Down The UP and DOWN buttons control the hoist motor and raise or lower the latch assembly and crosshead These functions only work in the manual mode and are de activated when the system is in the pneumatic mode and the crosshead latch is in the top position Arm The ARM ...

Страница 38: ... Envrn Chamber connection is located on the left side of the Model 8250 motor enclosure This connection is used when the EC8250 environmental chamber is installed on the Model 8250 and allows the chamber to interface with the Model 8250 s safety interlock system Consult the EC8250 environmental chamber manual for specific installation instructions ...

Страница 39: ... on the pneumatic clamp unless the Clamp On Off button on the pendent is set to ON Pneumatic Assist Pressure Regulator Pneumatic Assist Air Pressure The Pneumatic Assist Air Pressure regulator is located at the back of the Model 8250 on top of the motor enclosure The regulator and gauge combination is used to vary the velocity of the crosshead when the test machine is in pneumatic mode GRAV PNEU s...

Страница 40: ...Ancillary Machine Controls M14 13655 EN 4 6 e Continue to initialize the VELOCITY command and adjust the pressure incrementally until the desired velocity is obtained ...

Страница 41: ...5 1 Preparation for Use Chapter 5 Preparation for Use Outline Adjusting the Velocity Detector 5 2 Adjusting the Stop Blocks and Shock Absorbers 5 4 Installing the Crosshead Weights 5 6 ...

Страница 42: ...ector To find the correct position of the velocity detector 1 With a specimen in the support fixture lower the crosshead until the tup rests on the specimen 2 Loosen the two screws that attach the velocity detector to its support bracket 3 Slide the velocity detector up or down until the edge of interest of the flag see Figure 5 2 is approximately 1 4 inch 6mm below the center line of the velocity...

Страница 43: ...vity Mode The velocity of the crosshead when operating in the gravity mode can be determined analytically with the following equation v 2 gh Where v theoretical velocity ft sec m sec g acceleration of gravity 32 17 ft sec2 9 8 m sec2 h drop height in ft m Figure 5 2 Velocity Detector and Flag ...

Страница 44: ...5 4 Adjusting the Stop Blocks and Shock Absorbers Refer to the following procedures for information on setting the stop block and shock absorber height Figure 5 3 illustrates the stop block and shock absorber setup Figure 5 3 Shock Absorber and Stop Block Setup ...

Страница 45: ...op blocks Be sure there is ample clearance between the tup and the fixture to allow for deflection of the stop blocks on impact 4 When the crosshead and tup are resting on a specimen the optimum distance between the top of the stop blocks and the bottom of the crosshead is generally about 1 inch 2 5cm Specimens with large deflections to failure may require the stop blocks to be set to a lower posi...

Страница 46: ...et 5 5 lbs 2 5kg l set 10 0 lbs 4 5kg 1 set 25 0 lbs 11 3kg 1 set 50 0 lbs 22 7kg 2 sets 25 0 lbs 11 3kg with dowel pins The exact mass of each crosshead configuration is labeled on each weight set The following sections provide information on installing weights Refer to Figure 5 3 for an illustration of installing the add on weights Figure 5 3 Installing the Add on Weights ...

Страница 47: ...obs must engage the back weight plate 3 Tighten the hand knobs 4 Slide the assembly up and down the guide columns If it binds and shudders lower the crosshead to the stop blocks loosen the hand knobs rock the weights from side to side and retighten If the crosshead continues to bind or shudder contact Instron Dynatup 25 lb and 50 lb 11 3kg and 22 7kg weight sets 25 and 50 lb weight sets are instal...

Страница 48: ...ch x 1 0 inch 25mm long socket head cap screws Assembly Check out With lighter weights lift the weights by hand to ensure that they glide easily up and down on the guide columns Alternatively drop the crosshead from a known height and verify that the velocity at the velocity detector is within a few percent 2 of the theoretical value Be sure to measure the drop height from the center line of the v...

Страница 49: ...6 1 Operation Chapter 6 Chapter 6 Operation Outline Performing a Test 6 2 ...

Страница 50: ...men in the specimen support fixture 4 Remove any tools other foreign objects and the safety H bar from the enclosure and close the doors The ARM button illuminates 5 Position the crosshead at the desired height using the UP and DOWN buttons 6 Press and hold the ARM button The audible alarm sounds and the pneumatic clamp if installed closes 7 While still holding the ARM button press the FIRE button...

Страница 51: ...closure 4 Place the specimen in the specimen support fixture 5 Remove any tools other foreign objects and the safety H bar from the enclosure and close the doors The ARM button illuminates 6 Press and hold the ARM button The audible alarm sounds and the pneumatic clamp if installed closes 7 While still holding the ARM button press the FIRE button The latch hook opens allowing the crosshead to fall...

Страница 52: ...b 45kg crossheads to velocities above 14 5 ft s 4 4 m s 2 Set the top control pendent switches to MAN and PNEU If the pneumatic clamp is installed set the clamp ON OFF switch to ON 3 Set the pneumatic assist air pressure using the regulator on the top of the rear motor enclosure 4 Place the specimen in the specimen support fixture 5 Using the UP button raise the crosshead to the top position 6 Rem...

Страница 53: ...s to AUTO PNEU and if a pneumatic clamp is installed set the clamp ON OFF switch to ON Note that when the AUTO button is pressed the crosshead automatically rises to the top position 3 Set the pneumatic assist air pressure using the regulator on the top of the rear motor enclosure 4 Place the specimen in the specimen support fixture 5 Remove any tools other foreign objects and the safety H bar fro...

Страница 54: ...Performing a Test M14 13655 EN 6 6 ...

Страница 55: ...7 1 Maintenance and Troubleshooting Chapter 7 Chapter 7 Maintenance and Troubleshooting Outline Scheduled Maintenance 7 2 Troubleshooting 7 5 ...

Страница 56: ...t use a heavy oil or grease Do not apply solvent to the crosshead bushings and be sure to remove any steel wool fragments when finished Occasionally lubricate the latch pin roller bearings on the crosshead and the hook pin with light machine oil Apply a drop of oil to each bearing Refer to Figure 7 1 for an illustration of lubrication points Check the condition of the hoist cable by raising and lo...

Страница 57: ...ock absorbers should not leak oil and should offer mild resistance when compressed by hand The elastomeric stop block tops should be intact Replace the tops immediately when damaged Variances in the performance of the two stop block tops or shock absorbers can damage the crosshead Visually check the tup tup insert and tup cables for damage Check the safety enclosure door handles hinges and the bac...

Страница 58: ...Scheduled Maintenance M14 13655 EN 7 4 Figure 7 1 Lubrication Points LUBRICATION POINTS ...

Страница 59: ...osshead cannot be lowered To lower the crosshead the switch must be set to the gravity mode Check door interlock switches pendent cable air connections and air supply The hoist motor will only run if the yellow pendent light is on and pressurized air is connected to the system If motor clicks but will not run disconnect the power and remove the back panel of motor enclosure Check the mechanical re...

Страница 60: ...0 120V power for the hoist motor 3 AMP fuse for 240V power If fuses only blow when the weights are raised to the top Contact Instron Dynatup If fuses blow when pulling the tup out of specimens tup may be penetrating material that is too thick or too ductile for the motor to pull the tup free Contact Instron Dynatup Figure 7 2 Hoist Hub and Pinch Roller Assembly ...

Страница 61: ...ed it may take up to 5 seconds for the weight to drop Check switch next to hook for damage Contact Instron Dynatup if you suspect it is damaged Problem Hook will not close Possible Solution Check the switch next to the hook for damage Contact Instron Dynatup if you suspect it is damaged Other Problems Problem Abnormal Velocity Possible Solution Check that the guide columns are free from dirt the w...

Страница 62: ...Troubleshooting M14 13655 EN 7 8 ...

Страница 63: ... initiated crack under impact conditions Impact A situation in which a moving body strikes another body either at rest or moving Impact energy Total potential and kinetic energy of crosshead at impact Impact velocity Rate of speed of the falling crosshead at point of impact Incipient damage During the impact event the point at which the specimen first experiences any damage Also referred to as ons...

Страница 64: ...Glossary M14 13655 EN A 2 ...

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