Vibration Control System - UCSD Department of Physics
Contents
1. Hex Nut Support Plate Spanner Wrench ee Figure 3 Isolator Leveling Wrench 1 Refer to Figure 4 As shown use one of the special wrenches to hold the hex nut stationary Insert the prongs of the second wrench into the holes on the bottom of the support plate Rotate the plate using the top wrench to adjust the height 2 Place a level on the table top approximately in the center 3 For each isolator adjust the support plates as required to bring the table to a level condition Be sure to check the level using both the length and width axes of the table Verify that the centering disks are centered in and resting on their respective guides Figure 4 Support Plate Isolator fully down Hex Nut on stops no air applied ne DS cor 2 55 in 65 mm Bolt amp Clamp a Nominal St Centering Guide Figure 4 Level Adjustment of Isolators 2 3 2 3 1 4 When the table is completely level ensure by eye that every isolator support plate is snug against the table bottom and that each centering disk is centered in its guide Figure 4 5 Use the level to confirm that the table top is still level and equally supported by all isolator support plates Tighten all isolator clamp bolts snugly to secure the table to the isolators 6 Loosen the two screws securing each leveling valve to its bracket Slide the valve body until it is approximately 0 060 inches 1 5mm below the2. 8 2 3 1 Installing Leveling Valves nnn eeree ennen 8 DIZ Conmectime Ar LANGS sne hee a 10 2 3 3 Adjusting Leveling Valve Sensors eeen 13 2 4 Installing tables with the Doubler Interface eee 14 3 Operation 17 3L Ponc Meso Operom nenten eerden dian ied ieee nce wee 17 3 2 Perormance Adjustments screeni E A 17 F Mineri Oene a a a a 18 IL TC TC AIG a ER 18 Io AO aa Dentencrwentetauneed 19 4 Troubleshooting 20 Ab Table Top Does NobRIOat tiers mentele Le 20 4 2 Poor Isolation Performance unssnnnnnnnssererseennennnensseen 20 4 3 4 4 4 5 4 6 Table Top OSCiMAteS oroen nE i 21 System Leaks Air Constantly eeen eeenensenerseeeven 21 Oil Geak Prom ISOM OR ssensnrden dated eenderde dendert leidde aasndan 21 Adds Danie Oil steenen ordnnbekenteentdendteienehele 21 Factory Service 23 yi List of Figures Pieure Isolator POSION vorir O E 5 Figure 2 Isolator Clamps and Mounting Holes cc eeeeeseeeeeeeeeeees 6 Fiure s Isolator Leveling Wreneh eren okewioleteedi nied 7 Figure 4 Level Adjustment of Isolators sans eneeeneeennnnnnnenn 7 Proure IPV eveline MAINE oons armere wetalnscxctrean access are 9 Figure 6 Valves attaching to isolator ess eeneeeenenenennnnnnnenen 9 Figure 7 Orientation of Control Arm ssseeeeeereeeessssssssssssseseeeeereeeeess 10 Pisure 3 A Ame ROUNE sceteidatspeaicaetebediet ebnaeetnidatatendatebebendabetebindeis 11
3. CAUTION AN Bottled carbon dioxide CO is not recommended since icing can occur during rapid filling of the isolators 1 7 Warranty Information Warranty information may be found on the page preceding the Table of Contents in this manual Should it become necessary to exercise the watranty contact your Newport representative to determine the proper course of action Newport Corporation maintains offices throughout the United States and other locations worldwide 2 2 1 2 1 1 2 1 2 Assembly Assembling the System Table Installation Assistance Optical tables are heavy Even a small table top weighs over 500 pounds 227 Kg Contact Newport or your local sales representative for help in preparing your facility Positioning the Isolators Figure shows the correct isolator positions for standard table sizes Table 1 shows the correct dimensions A B amp C for each table size Figure 1 Isolator Position Table Width Table Length A B C ft mm ft mm in mm in mm in mm 3 900 6 1800 14 341 30 733 35 5 899 5 1500 12 3600 38 941 70 1720 82 75 2054 16 4800 Table 1 Isolator Positions 2 1 3 Installing Table Top If your table is equipped with a Doubler Interface be sure to follow the instructions in Section 2 4 for assembling the table sections prior to installing them on the isolators WARNING Table tops are heavy Use a forklift or other appropriate equi
4. Detail of Valve Connections Single Isolator 2 Close the metering needle valve Figure 9 on each valve and then open it turn for each isolator that is connected to it For example if the valve controls two isolators the needle valve is opened 1 full turn Please note If you have a minimum load on your optical table top open the metering valve about of a turn 3 Turn on the air supply and adjust the regulator for the pressure calculated using the formula given in Section 1 6 This pressure must not exceed 95psig 6 7 kg cm Figure 10 Detail of Valve Connections Two Isolators 4 Check all connections for leaks Correct or repair any leaks before proceeding 5 If the table does not float within several minutes increase the air pressure until the table floats or adjust the value height sensors to hold 2 3 3 13 the control arms further down Confirm that the needle valves are open Y turn per isolator supplied NOTE If the table oscillates after it floats decrease the air pressure or close the needle valves slightly In clean room applications the EXH exhaust port on the valves may be connected to the clean room vacuum system to capture the valve exhaust NOTE Exhaust must be routed to a vacuum system Backpressure in the tubing will cause the exhaust air to leak from the valve Adjusting Leveling Valve Sensors l After the table floats check the position of the centering guide a
5. Figure 9 Detail of Valve Connections Single Isolator 12 Figure 10 Detail of Valve Connections Two Isolators 12 Figure 11 Floating Height Adjustment and centering cc eeeeeeeeeeeee 14 Figure 12 Typical Double Interface System ceeeeeeeeeeeeeeeeees 14 Figure 13 Double Bolt Tightening Sequence cc eeeeeeeeeeeeeeeeeees 16 Broute A Systems ta ality a e E elek eed 18 1 1 1 2 1 3 General Information Introduction The Newport Vibration Control System provides an ideal working platform for vibration sensitive devices such as interferometers microscopes and balances The table surface is isolated from floor motion using the Stabilizer pneumatic suspension system The versatile Newport Vibration Control System is available in a variety of sizes working surfaces and options These systems integrate Newport s rigid laminated honeycomb panel technology and pneumatic isolation systems to provide a mounting platform which is rigid yet thin and light weight It is possible to tailor the system to a wide variety of applications using the entire range of sizes and working surfaces A typical Newport Vibration Control System consists of an optical table and vibration isolators The S 2000 Stabilizer isolation system is capable of supporting 2000 pounds per isolator Caution must be observed to ensure that heavy payloads are not located off center on the tab
6. valve Air line to isolator Over pressure relief valve Table height adiustment screw Mounting screw holes Figure 5 IPV Leveling Valve Table height adiustment screw Peet Re Mance Row Isolator Figure 6 Valves attaching to isolator The valves should be attached to the isolators as shown in Figure 6 after installing the table top 1 Set the table height adjustment screw on each valve to the center of its travel Figure 6 2 Attach the leveling valve to the isolators as shown in Figure 6 Secure the valve to the bracket using the two mounting screws and the nutplate Position the valve at the bottom of the bracket slots until after the table is installed and leveled Rotate the control arm on valves A in Figure 7 so that they point towards the nearest corner of the table Rotate the control arm on valve B in the figure so that it points toward the table s center midway between the isolators that it controls For systems with more than four isolators use the same basic setup just described Two valves control the height of the two end corners A amp A while the third valve B controls the height of the opposite end Figure 8 lsalatar IAN va P i vo pe Control Arm Table Top Figure 7 Orientation of Control Arm 2 3 2 Connecting Air Lines l Connect air lines to the isolators as shown in Figure 8 When cutting tubing be sure the en
7. If the combined center of gravity of the payload and table top is within the stable region the system will be stable If the combined C G is inside the may be stable region the 3 3 3 3 1 system may be stable If the combined C G is outside both regions the system will probably be unstable May Be Stable Ragion F q 4 Figure 14 System Stability 3 Improving leveling response times If the system is stable the re leveling response time may be decreased by increasing the system pressure In addition the needle valves may be opened until the system oscillates and then closed slightly This is desirable if components are moving over the surface of the table For systems where the loads are seldom changed slower re leveling may be beneficial This is accomplished by closing the needle valves slightly and or decreasing the system pressure All needle valves should be opened the same amount for each isolator that they supply 4 Table loads and or load positions change If the loads are moving or changing significantly the control arms may require adjustment Each time the load is changed check the relationship of the centering guide to the flange on each isolator If the desired inch is not maintained adjust the overall system pressure and or the sensor positions Newport Vibration Control Systems require little maintenance No periodic maintenance is required Maintenance Cleaning Newport op
8. LIED INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE NEWPORT CORPORATION SHALL NOT BE LIABLE FOR ANY INDIRECT SPECIAL OR CONSEQUENTIAL DAMAGES RESULTING FROM THE PURCHASE OR USE OF ITS PRODUCTS First printing 2009 2009 by Newport Corporation Irvine CA All rights reserved No part of this manual may be reproduced or copied without the prior written approval of Newport Corporation This manual has been provided for information only and product specifications are subject to change without notice Any change will be reflected in future printings Newport Corporation 1791 Deere Avenue Irvine CA 92606 USA Part No 90030352 Rev B Table of Contents NN IGAO en eneen dennen A E i TaDle OF COMMS ernas estar ieesteamiaieenestadedaresrereiaes 1V LASCO TIDO CS aa E det denees vi 1 General Information 1 PE AMO ON enen lopaes fovzecea wiaetec to necedien l EZ Gemine Sae anke asthenie l L3 Unpackins and IMS pe Cu 6 nerens l L4 Batey Considera ONS ean a a N 2 Po Table PICe ment eene dede 2 L6 Amr Supply Requirements ersiersiuipnnnaininen epaia 3 LE Warni inlonnaioi eas a a a nas 4 2 Assembly 5 2k Assembine the SysteM irene a a S 5 2 1 1 Table Installation Assistance nnn oeneeeenennnen 5 2 1 2 Positioning the Isolators annsnnnnnnnereeneennenn 5 DAS Astellas Table ToP eccere detains 6 22 Leveling the Taberei emelten 7 2 Asolating the Table LOPE mennen a N
9. Vibration Control System S 2000 Stabilizer Vibration Isolators and Optical Table Installation Manual User s Manual Ss Newport Experience Solutions Warranty Newport Corporation warrants that this product will be free from defects in material and workmanship and will comply with Newport s published specifications at the time of sale for a period of one year from date of shipment If found to be defective during the warranty period the product will either be repaired or replaced at Newport s option To exercise this warranty write or call your local Newport office or representative or contact Newport headquarters in Irvine California You will be given prompt assistance and return instructions Send the product freight prepaid to the indicated service facility Repairs will be made and the instrument returned freight prepaid Repaired products are warranted for the remainder of the original warranty period or 90 days whichever first occurs Limitation of Warranty The above warranties do not apply to products which have been repaired or modified without Newport s written approval or products subjected to unusual physical thermal or electrical stress improper installation misuse abuse accident or negligence in use storage transportation or handling This warranty also does not apply to fuses batteries or damage from battery leakage THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMP
10. bottom of the table Be sure the valve is not tilted then tighten the screws Figure 6 Isolating the Table Top Installing Leveling Valves The IPV leveling valve is shown in Figure 5 Three valves are used in all systems regardless of the number of isolators as only three points are required to determine a plane The leveling valve locations are selected such that they form the largest triangle possible under the table The larger the triangle the more stable the system will be When two or more isolators are controlled by the same valve they act as a single large isolator supporting the table at the center of force of the several isolators The floating height of the system is determined at the valve position Therefore ideally the valves should be located at the center of force of the isolators they control In practice however simply grouping the isolators and their control valves 1s sufficient The groups of isolators and their valves act as three legs for the system The center of gravity of the combined table and payload must be within the triangle formed by the centers of force of the isolator groups for the system to float Figure 8 shows valve and isolator arrangements for rectangular tables Complex table shapes require isolator and valve layouts designed specifically for each application Table height sensor Control arm Isolator pressure gauge N Air supply gt cS AD Metering wa TE needle
11. ds are round and cut squarely This is best done with a single edge razor blade scissors will deform the tubing causing leaks The connections are detailed in Figures 8 9 and 10 a Use translucent tubing to connect the air supply to each of the leveling valves Use Tee connectors as required Press the free end of the tubing into the yellow collar of the valve s IN connector Be sure the connection is firm by tugging on the tube b Connect a length of grey tubing supplied with the valves for use on the valve barb fitting between the hose barb on the valve and the inlet connector on the isolator Figure 9 If more than one isolator is supplied by a valve use Tee connectors as required Figure 10 Connect the grey tube from the valve to the Tee and use translucent tubing between the Tee and each isolator 11 3 Isolator Schematic Leveling Valves CLN A 3 Reqd leenen T Vt 7 Table Width Air IN Regulator J a Less 12 Filter E Typ All Tables ae Air Supply st a A m a 4 Isolator Schematic ZN Leveling Valves j 3 Reqd yy Air a Regulator Filter Air Supply ar Leveling Valves i 3 Reqd A Ait Regulator Ss Filter Air Supply ap 8 Isolator Schematic A l _ ns hen Leveling Valves 3 Reqd Air Regulator Filter Air Supply ar Figure 8 Air Line Routing 12 Metering needle valve Figure 9
12. he following instructions are applicable only to those tables equipped with the Doubler Interface Figure 12 shows a typical Doubler Interface System 1 Use the procedures in Section 2 1 2 and 2 3 1 to assemble the isolators for both table sections 2 Carefully uncrate each table top noting the correct orientation indicated on the crates Carefully check the doubler faces for any damage that might prevent them from fitting tightly together Tabla Table Section Saction ae 1 tt A r A r d AA a a a il A Figure 12 Typical Double Interface System 3 Position the isolators for one table section as described in Section 2 1 2 Install valves on the appropriate isolators as shown in Figure 8 4 Install the first table section on the isolators as described in Section 2 1 3 i Do not force the bolts The second table section should be 10 11 12 13 15 NOTE It may be necessary to use jack stands to support the first table section if fewer than four isolators are located under the section Position the second table section on three jack stands mounted on dollies Adjust the position of the table so that it is at the same height as and adjacent to the first table section Align the two table sections using a straight edge Carefully roll the second table section toward the first so that the alignment dowel pins engage in their mating holes Be sure the bolts are aligned with t
13. heir corresponding holes Draw the two table sections together approximately inch Smm using the two outermost top bolts CAUTION easily pulled up to the first Figure 2 13 shows correct bolt head position during assembly Do not cause the first table section to shift sideways on its isolators Doing so could damage the isolators Tighten all of the bolts until they are finger tight or until they just begin to move the table sections together Do not force or over tighten the bolts Repeat steps G and H until the two table sections are completely drawn together When all bolts are snug apply a final torque of 60 pound feet 80 N M to all bolts using the sequence shown in Figure 13 Jack up the assembled table as required to install the remaining isolators and leveling valves Install the isolators and valves as described in Section 2 1 Remove the jack stands and level the table as described in Section 2 3 Install the air lines and float the table as described in Section 2 3 16 Female Table Male Table Incorrect See CAUTION Figure 13 Double Bolt Tightening Sequence 3 1 3 2 17 Operation Principles of Operation The S 2000 Stabilizer Isolators provide one of the best methods of vibration isolation for critical applications The system operates on the principle of air pistons which are equivalent of soft springs The main advantage of the Newport system over other designs are low ver
14. iculty during the leveling of the table top if their irregularity 1s outside of the adjustment range of the isolators The S 2000 Stabilizer isolator must be mounted so that its axis is not more than 0 5 degrees from vertical This is necessary for the isolator to function properly in the horizontal mode Note 0 5 degrees is equal to 0 09 2 2 mm inches in 10 0 inches which is the isolator base diameter A typical spirit level will easily measure 0 5 degrees and can be used to check the vertical alignment of each isolator If the floor where the isolators are being mounted has a depression of more than 0 09 inches under one side of the base then the floor should be grouted or shimmed level at this location If the system is not located on the ground floor of the building it should be located near primary vertical structures such as exterior walls or support columns By locating the table near these structures the effects of low frequency floor motion will be minimized thus increasing the performance of the table It is also advisable to avoid locations adjacent to major sources of vibration from operating machinery such as elevators air conditioning plants or factory equipment 1 6 WARNING The table top is attached to the isolators with clamps and hex head bolts In the event of an earthquake the table may collapse For areas susceptible to earthquakes we recommend that Newport Earthquake Restraints be installed on each Vibrat
15. ion Control System WARNING The table top is a metallic electrical conductor For installations where electrical shock is a possibility the table top should be grounded to prevent personal injury Air Supply Requirements A constant supply of air must be connected to the Vibration Control System during operation After initial setup and filling the isolators consume air only when the leveling valves adjust the pressure to compensate for changes in the load on the table Bottled nitrogen or mechanically compressed air may be used The required pressure is determined by dividing the total load including table weight by the total isolator diaphragm area 25 9 in per isolator plus 5 10 psig For example if the table plus load is 2850 pounds and will be mounted on 4 isolators the required pressure 1s 2620 lbs 4x 25 9 in Note that the maximum operating pressure for the system is 95 psig 6 7 kg em 10 psig 37 5 psig The Newport Model ACGP air compressor is an extremely quiet source of clean pressure regulated air If another compressor or plant air is used the Newport model ARF Air Regulator Filter should be used to ensure maintenance free operation These filters prevent water and dirt from getting into the leveling valves and causing the valves to fail due to clogging The supply should include a valve so that the air may be shut off during maintenance or extensive setup when the load is changed drastically
16. le surface This could cause overloading of one isolator even though the average load per isolator is below the 2000 pound limit Getting Started Heavy payloads with very high centers of gravity C G may cause the isolation system to oscillate Please consult Section 3 2 of this manual or Newport Applications Engineering for high C G applications Please read this instruction manual thoroughly before assembling the table system The individual components have been assembled at the factory and require only final system assembly and performance adjustment Unpacking and Inspecting The components of your Newport Vibration Control System are packed in individual labeled boxes Be sure the number of boxes you received is equal to the total number listed on the label for example if a box is labeled 1 of 4 there should be 4 boxes 1 4 1 5 Safety Considerations Carefully inspect all components for shipping damage Report any shipping damage immediately to the shipping company and Newport The following terms are used in this manual that relate to your safety WARNING Warning is used to indicate dangers that could result in personal injury CAUTION Caution is used to indicate situations that may result in damage to components of your Newport Vibration Control System Table Placement To ensure optimal performance from your Vibration Control System it should be located on a level surface Uneven floors may cause diff
17. ly refer to Section 2 3 2 If testing with soapy water indicates that either the isolator or valve are leaking contact Newport Customer Service Oil Leak From Isolator Damping oil may leak from the isolator if it is inverted or tilted more than 45 degrees If more than cup 30ml of oil is lost add additional oil available from Newport Corporation as directed in Section 4 6 Losses of less than s cup will not affect the isolator performance Total volume of damping oil per isolator is approximately cup 125ml Adding Damping Oil If the isolator loses damping oil additional oil may be added as follows 1 Remove the air pressure from the isolator and allow the piston to retract Ensure that the remaining isolators will support the table or use a jack stand to replace the isolator to be serviced Loosen the three bolts securing the support plate to the bottom of the table and slide the isolator from under the system WARNING The table top is heavy and may cause severe personal injury if it falls Be sure it is properly supported before getting underneath the table top or removing the isolator 2 Measure the height of the support plate relative to the centering disk Figure 2 4 Record this distance so that the isolator may be returned to its normal position 3 Unscrew the isolator support screw right hand thread and remove the plate and jack screw from the piston assembly 4 Use a funnel to add damping oil thr
18. nd flange of all isolators Figure 11 The gap between the guide and flange should be 4 Ns 6mm 1 5mm The center of the isolator centering disk should be aligned with the float height indicator tabs Figure 11 Adjust the Table Height sensor screw of each isolator Figure 5 as required to obtain this gap When all isolators are adjusted re check the level of the table NOTE this step should require only minor adjustments Do not move the small set screw near the pivot of the valve control arm If the table is no longer level you may have to remove the air pressure and re adjust the height of the isolator support plates as described in Section 2 Verify that the table is freely floating on the isolators Move the table gently from side to side about 14 You should not encounter any resistance Re check by moving the table up and down the same amount Again there should be no restriction of movement Push one corner of the table down approximately 14 and release it The table should return to the original position within less than 4 seconds Response time may be adjusted as described in Section 3 2 Support Plate P Y 5 ad 1 16 Centering disk Ps Float height indicator 14 Above alignment tabs Even with alignment tabs Below alignment tabs Incorrect centering Correct centering Figure 11 Floating Height Adjustment and centering 2 4 Installing tables with the Doubler Interface T
19. nd of moving air Repair or replace any clogged valve Use the ARF filter regulator to prevent this situation Poor Isolation Performance The following may lead to poor isolation performance of your system L Vibration may be transmitted to the table through direct physical contact of equipment with external sources of vibration Isolators that float too high too low or are not centered may conduct floor vibration to the table top Refer to Section 2 3 2 Figure 11 Centered isolators will remain centered unless the table and isolators are moved relative to each other Equipment on the table may be vibrating at a resonant frequency of other components Improve the rigidity of the mounting for that equipment or remove that item from the table Non level floor may prevent the horizontal isolation system from functioning properly see Section 1 5 4 3 4 4 4 5 4 6 21 Table Top Oscillates If the table top oscillates or hunts you may have a set up with a high center of mass Refer to the information in Section 3 2 or consult your Newport representative or Newport Corporation for further assistance System Leaks Air Constantly All Newport isolators and valves are pressure leak tested prior to shipment Check all tubing connections for leaks with soapy water Tubing that is crushed out of round or that is not cut squarely may not seal in the push in fittings Use a single edge razor blade to cut the tubing clean
20. ough the support shaft hole until the oil level is approximately 4 6 4mm from the bottom of the piston Allow time for the viscous oil to settle before measuring the oil level 22 Use a clean small diameter rod to check the level When checking the level be sure the rod sits on the bottom of the piston and not on the narrow ledge at the bottom of the support shaft Reverse Steps 2 and 3 to re assemble the isolator Return the support plate to the position noted in Step 2 Reinstall the isolator and apply air pressure Make any required adjustments to return the system to operation 23 Factory Service To obtain information concerning factory service contact Newport Corporation or your Newport representative Please have the following information available 1 Model number 2 Purchase order number 3 Complete description of the problem If components are to be returned to Newport Corporation you will be given a Return Number which you should reference in your shipping documents Please fill out the service form located on the next page and have the information ready when contacting Newport Corporation Include the completed service form with any parts or components that are returned
21. pment Be sure to use proper lifting procedures to avoid severe personal injury 1 With the isolators located as described in Section 2 1 2 raise the table top and position it above the isolators Be sure each isolator is centered within the tapped three hole patterns on the lower surface of the table Pal bh af lan Isolator Clamp mi N Hex Head bolt A ad af Pad ee Flat Washer i ri A 3 per Isolator ro Pa ee e p d k Nae a rs an a mi r4 ge a a Pi he Men K al i ba 7 C a i Oo 4 ep 5 Bae a 3 y 7 h ee B ee ee i aut ern N a En of Ne Ne S gt Age Pn a A Pans y B ae ef Y ee y p Table Bottom ADN Surface Pe 4 J on A aa AN Figure 2 Isolator Clamps and Mounting Holes 2 Gently lower the table so that is just above the top of isolators Install three isolator clamps in the corners where each isolator is located Figure 2 Loosely secure the clamps with the bolts Do not tighten the clamps at this time 4 Lower the table top until it rests on the isolator support plates CAUTION AN When lowering the table on to the supports do not allow the table to shift sideways Doing so could damage the isolators and cause degradation in performance 2 2 Leveling the Table Use the following procedure to level the table The special wrench Figure 3 is for all adjustments Support i Clamp E Bolts a Level Adjustment
22. tical resonant frequency with low amplification at resonance Q and a Pendulum horizontal decoupling system for effective isolation from low amplitude vibration Newport optical tables provide a working surface that is statically rigid with high internal tuned damping for high dynamic rigidity and minimal response to environmental disturbances The leveling valves provided with the system control the height of the table to within 0 01 0 3mm accuracy This tolerance is adequate for most applications More accurate valves are available for specialized applications Performance Adjustments Once the system is assembled and the table floating it is possible to make minor adjustments to suit your individual needs These adjustments involve the system air pressure the control arms and needle valves WARNING Once the table is floating keep fingers away from the area between the centering guide and outer clamp of the isolators Any object between these points may be caught if the table load or air supply changes causing personal injury 1 Stabilizing high center of mass loads If your load has a high center of mass or if the load is particularly heavy the table may oscillate In this case lower the system pressure or close the needle valves slightly This may improve stability and reduce the oscillation or hunting 2 A rule of thumb for determining high center of gravity C G system stability is shown in Figure 14
23. tical table tops are made of 400 series stainless steel This material is relatively corrosion resistant It may be cleaned by applying non abrasive liquid household cleaner to a rag and wiping the table top Avoid abrasive cleaners as they will foul the mounting holes All other surfaces on the table top or isolator system may be cleaned in the same manner 3 3 2 19 Air Quality Oil water or debris in the air supply may contaminate the leveling valves or isolator damping system and degrade performance Use of the Newport model ARF Air Regulator and Filter in the air supply will prevent this occurrence The filter does require occasional cleaning 20 4 4 1 4 2 Troubleshooting Table Top Does Not Float Use the following procedure if the table top does not float or lift up when pressure is applied to the isolators I Ensure that the supply pressure is 5 10 psig 0 4 0 7kg cm above the pressure reading of any of the leveling valves If the load is increased the pressure should be increased to maintain the difference between supply and valve pressure Refer to Section 1 6 Check to see if all air lines are connected properly and the supply pressure is adequate see step 1 Refer to Figures 8 9 and 10 Be sure that the needle valves are not closed completely Check each leveling valve for clogging To do this press the control arm down Air should flow into the isolator accompanied by the familiar sou
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