NASA/George C. Marshall Space Flight Center, Procurement Office, Marshall Space Flight Center, AL 35812

66 -- ULTRASONIC IMMERSION TANK SOL 8-1-0-ED-C7007 DUE 050500 POC Gloria J. Coffey, Contract Specialist, Phone (256) 544-9187, Fax (256) 544-8688, Email gloria.coffey@msfc.nasa.gov -- Michael R. Sosebee, Contracting Officer, Phone (256) 544-0415, Fax (256) 544-8641, Email michael.sosebee@msfc.nasa.gov WEB: Click here for the latest information about this notice, http://nais.msfc.nasa.gov/cgi-bin/EPS/bizops.cgi?gr=D&pin=62#8-1-0-ED-C7007. E-MAIL: Gloria J. Coffey, gloria.coffey@msfc.nasa.gov. The purpose of this amendment is to open this procurement to interested parties on a Small Business Set-Aside basis. All qualified small business sources may submit a quote which shall be considered by the Agency. An ombudsman has been appointed -- See internet Note "B." Prospective offerors shall notify this office of their intent to submit an offer. It is the offeror's responsibility to monitor this site for the release of the solicitation and amendments (if any). Potential quoters will be responsible for downloading their own copy of this solicitation and amendments (if any). Any referenced notes can be viewed at the following URL: http://genesis.gsfc.nasa.gov/nasanote.html . The following Statement of Work (Description of Effort) is to be used in the preparation of quotations. The closing date is extended to CLOSE OF BUSINESS (COB) May 5, 2000. The revised (updated) effort for the Ultrasonic Immersion Tank, Quantity: 1, is as follows: Salient Features of Ultrasonic Immersion Tank 1-ED-C7007 Solicitation This tank will replace an existing ultrasonic immersion tank with current tank size of : 48"W x 33" Depth x 54" length, and active X-Y scan area of 40"W x 45"L. The existing tank is desired as a trade-in if possible, to make room for the new tank and to reduce the cost. The current tank is a Testech Model LS-86. The new tank should have the following salient features: ALL THE DISTANCES ARE MEASURED CENTER LINE OF SEARCH TUBE TO CENTER LINE OF SEARCH TUBE. SPEED RAMP UP AND RAMP DOWN DISTANCES AND WATER SPLASH SHOULD BE TAKEN INTO ACCOUNT. Tank Size: 48" W x 42"D x 84" L Active X-Y Scan area: 32"W x 76"L Two independently driven Y axes 36" usable water level in non-turntable area: 36" from tank bottom Water over the turntable: at least 25" Active area X Scan with dual Z index (passing over turntable): 26"D x 76"L Active area -- X scan with dual Z index (non-Turntable area): 36" D x 42" L A vertical scan rate of 10"/sec The bridge design will be a three rail design to insure stability and accuracy All AXES WILL BE SERVO DRIVEN The manipulator registration shall be very good with complete scan coverage in water giving close to 1 dB loss but not much more, over the whole area of scanning capability. There will be a degree of orthogonality with all axes being within .01" per foot of travel. Straightness of axes will be 0.01" per foot of travel. A hand held pendant will be provided that can control all of the setup parameters and all of the possible 10 axes. Clock & direction signals or quadrature signals will be provided to interface with an existing SONIX C-Scan Data Acquisition system containing a 8100D A/D board. BACKLASH allowed will be .003" for X, Y1, Y2, Z1, Z2. BACKLASH allowed for gimbal/swivel will be .05 degree. The repeatability for X, Y1, Y2, Z1, Z2 will be .003" after backlash is removed. The repeatability for gimbal/swivel is 0.05 degree after backlash is removed. The System components will include: 1. Immersion tank: inside dimensions of 48"W x 42"D x 84"L 2. Bridge rail assembly 3.X-Axis Drive -- consisting of inverted fine pitch racks mounted to the front and rear of the immersion tank 4. Bridge Assembly -- With dual independently driven Y carriages 5. Manipulators -- Two (2) three-axis motorized manipulators with gimbal/swivel motion. 6. 24" diameter turntable with three jaw self-centering chuck 7. Water conditioning system 8. Motor Control -- Ten axis servo/encoder control with system computer and monitor The immersion tank will be stainless steel lined inside. A 14" viewing window will be provided at the front of the tank. Emergency stop switches will be placed in front and rear of tank and front and rear of bridge. A dual carriage bridge with: X travel of 76" and Y1 and Y2 travel of 32". The turntable will be no more than 10" tall from bottom of tank, leaving about 26" of water above the table and then 6 more inches from the top of tank (assume water level is 6" below top). The adjustable centerline distances between the manipulator tubes will be adjustable from 8" minimum to 40" maximum. There shall be a 36" travel along each Z axis. Turntable will have 2000 pound capacity and run from 1-20 RPM smoothly. The contractor will provide installation labor of all tank components. The contractor will provide two (2) days of operator training for two (2) NASA personnel after system installation is complete. THE Y-AXIS (transverse) One primary Y axis and a secondary Y axis. Both work the same and are independently driven. They can both be slaved and work together as well. The Y-axis carriage will be driven by precision ground ball screw. The screw will be suspended in large bearings, turned by a belt coupled, high quality DC servo motor with encoder. Axis resolution = 1 encoder pulse per 0.001" of travel. There will be no backlash. With the secondary Y-axis manipulator, a crash limit and shock absorber will be installed to prevent mechanical damage between the carriage assemblies. A tachometer should be included to add more motor control. THE X-AXIS (Longitudinal) This axis also will include hardened ball bushing shafts, supported along their entire length. This axis should ride along longitudinal shafts on both sides of the entire tank and have at least four mounted adjustable linear ball bushings that suspend the bridge on the hardened ball bushing shafts. This X-Axis will include a high quality DC servo motor with encoder. A tachometer should be included to add more motor control. The encoder line count will provide axis resolution of one encoder pulse per .001" travel. MANIPULATOR ASSEMBLIES The two (2) manipulator assemblies will be motorized in the Z, gimbal (pitch) and swivel. The Z-axis will include: a bearing housing with a bearing spread of 15 inches, a high quality DC servo with encoder coupled to a spur gear transmission utilizing precision custom made gears, a tachometer, a transmission output shaft which contains a precision pinion gear that engages in a precision hardened stainless steel rack mounted to the search tube, an axis resolution of 0.001", a fail safe brakingsystem (when power is removed), homing limits, physical stops and shock absorbers. The search tubes will be stainless steel, ground to a 2.0" diameter, and will contain a precision, hardened, >" wide stainless steel rack. The rack will be radiused to the tube surface and will be restrained via cam followers in a bearing housing. The gimbal and swivel drives consist of high quality DC servo motors encoders directly coupled to a harmonic transmission. The gearing will produce axis resolutions of 0.01 degree. The gimbal range will be 210 degrees and the swivel range will be 360 degrees. THE TANK The tank skin will be fabricated from welded stainless steel sheet and be a minimum of 1/8" thick. All welds will be ground smooth, passivated and watertight. The standard tank structure will support evenly distributed weight of approximately 350 pounds per square foot. The exterior frame assembly will be primed and finish painted with blue polyurethane based paint. A suitable drain/fill system will be provided where a hose can be mated and draining and filling operations can be performed by flipping a switch or lever. No exchanging of tubes or fittings will be made to distinguish the two operations. THE TURNTABLE A stainless steel turntable with a continuous turning design and indexing capability will be provided. It will be driven by a DC servo motor with an encoder outside the immersion tank. The turntable can be sealed to a machined stainless steel plate welded to the bottom of the immersion tank. The turntable motor assembly will produce feedback for proper calibration in the setup. All materials will be non-corrosive. The speed will be up to 20 RPM and as slow as 1 RPM. Diameter of turntable will be 24". The resolution of turntable will be 0.05 degree. The turntable will run clockwise and counter-clockwise. The load capacity will be an evenly centered load of 2000 pounds. Provide outriggers which will limit face plate deflection for loads up to 750 pounds and protect the bearings from damage. A three jaw chuck assembly will be provided for final centering of a part. MOTOR CONTROL A ten axis motor control will be provided. A PC computer will be used as the interface. The scan types that will be available: X scan Y1 index Y1 Scan X index X scan Z1 index X scan Z1 and Z2 Synchronous Index TT scan Z1 index TT Scan Z1 and Z2 index TT scan Y index TT scan X index Z1 scan X index Z1 & Z2 Synchronous Scan with X index Z1 scan with TT index Z1 & Z2 Synchronous Scan with TT index The user will be able to input scan speed, scan limit, index increment, total index, scan direction, index direction or any other useful scan inputs. User feedback will be provided for motor limits or scan limits that are exceeded by the user on input. The data acquisition interface will be discussed but there should be connector outputs to interface with from the motor control. THE WATER SYSTEM The water recirculating system should have a 25 GPM pump at least with a filter housing (25 micron filter) and a pressure gage. All drain, fill lines and valves are PVC. The pump will have an automatic thermal overload protection circuit. Water will be drawn into the pump from a self adjusting tank mounted surface skimmer and the tank bottom. The surface skimmer shall adjust to water level changes. The system will be used to pump out the tank and/or gravity drain. A non-optional warranty against factory defects in materials and workmanship under normal tank use will be provided for at least 6 months from installation and checkout date. Posted 04/13/00 (D-SN444554). (0104)

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