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  • 1
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    Tribology experiment (1981)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: A two-dimensional concept for Spacelab rack 7 was developed to study the interaction of liquid lubricants and surfaces under static and dynamic conditions in a low-gravity environment fluid wetting and spreading experiments of a journal bearing experiments, and means to accurately measure and record the low-gravity environment during experimentation are planned. The wetting and spreading process of selected commercial lubricants on representative surface are to the observes in a near-zero gravity environment.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA. Marshall Space Flight Center Spacecraft Dyn. as Related to Lab. Expt. in Space; p 58-60
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Automated weld torch guidance control system (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A device for automatically controlling the movement of a welding torch while welding an elongated joint is described. A charge injection television camera is carried on a movable support. The camera includes a matrix of individual light sensing video elements which generate voltages responsive to light reflected off of the joint and surrounding areas of the work piece. The voltages produced by the pixels are converted to digital words which are fed to a microprocessor for generating an error signal. This error signal is fed to a digital motor which is used to drive a movable support upon which the television camera is carried.
    Keywords: MECHANICAL ENGINEERING
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Real time computer controlled weld skate (1977)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A real time, adaptive control, automatic welding system was developed. This system utilizes the general case geometrical relationships between a weldment and a weld skate to precisely maintain constant weld speed and torch angle along a contoured workplace. The system is compatible with the gas tungsten arc weld process or can be adapted to other weld processes. Heli-arc cutting and machine tool routing operations are possible applications.
    Keywords: MECHANICAL ENGINEERING
    Type: Proc. of the ASPE(MSFC Symp. on Eng. and Productivity Gains from Space Technol.; p 159-164
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Computerized adaptive control weld skate with CCTV weld guidance project (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: This report summarizes progress of the automatic computerized weld skate development portion of the Computerized Weld Skate with Closed Circuit Television (CCTV) Arc Guidance Project. The main goal of the project is to develop an automatic welding skate demonstration model equipped with CCTV weld guidance. The three main goals of the overall project are to: (1) develop a demonstration model computerized weld skate system, (2) develop a demonstration model automatic CCTV guidance system, and (3) integrate the two systems into a demonstration model of computerized weld skate with CCTV weld guidance for welding contoured parts.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-X-73328
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Evaluation of a method to shield a welding electron beam from magnetic interference (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: It is known that electron beams are easily deflected by magnetic and electrostatic fields. Therefore, to prevent weld defects, stray electromagnetic fields are avoided in electron beam welding chambers if at all possible. The successful results of tests conducted at MSFC to evaluate a simple magnetic shield made from steel tubing are reported. Tests indicate that this shield was up to 85 percent effective in reducing magnetic effects on the electron beam of a welding machine. In addition, residual magnetic fields within the shield were so nearly uniform that the net effect on the beam alignment was negligible. It is concluded that the shield, with the addition of a tungsten liner, could be used in production welding.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-X-73324
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Computerized system for translating a torch head (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The system provides a constant travel speed along a contoured workpiece. It has a driven skate characterized by an elongated bed, with a pair of independently pivoted trucks connected to the bed for support. The trucks are mounted on a contoured track of arbitrary configuration in a mutually spaced relation. An axially extensible torch head manipulator arm is mounted on the bed of the carriage and projects perpendicular from the midportion. The torch head is mounted at its distal end. A real-time computerized control drive subsystem is used to advance the skate along the track of a variable rate for maintaining a constant speed for the torch head tip, and to position the torch axis relative to a preset angle to the workpiece.
    Keywords: MECHANICAL ENGINEERING
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    The development of a microprocessor-controlled linearly-actuated valve assembly (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The development of a proportional fluid control valve assembly is presented. This electromechanical system is needed for space applications to replace the current proportional flow controllers. The flow is controlled by a microprocessor system that monitors the control parameters of upstream pressure and requested volumetric flow rate. The microprocessor achieves the proper valve stem displacement by means of a digital linear actuator. A linear displacement sensor is used to measure the valve stem position. This displacement is monitored by the microprocessor system as a feedback signal to close the control loop. With an upstream pressure between 15 and 47 psig, the developed system operates between 779 standard CU cm/sec (SCCS) and 1543 SCCS.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-174437 , JPL-9950-976 , NAS 1.26:174437
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Automatic weld torch guidance control system (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A highly reliable, fully digital, closed circuit television optical, type automatic weld seam tracking control system was developed. This automatic tracking equipment is used to reduce weld tooling costs and increase overall automatic welding reliability. The system utilizes a charge injection device digital camera which as 60,512 inidividual pixels as the light sensing elements. Through conventional scanning means, each pixel in the focal plane is sequentially scanned, the light level signal digitized, and an 8-bit word transmitted to scratch pad memory. From memory, the microprocessor performs an analysis of the digital signal and computes the tracking error. Lastly, the corrective signal is transmitted to a cross seam actuator digital drive motor controller to complete the closed loop, feedback, tracking system. This weld seam tracking control system is capable of a tracking accuracy of + or - 0.2 mm, or better. As configured, the system is applicable to square butt, V-groove, and lap joint weldments.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-82503 , NAS 1.15:82503
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Investigations for the improvement of space shuttle main engine electron beam welding equipment (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Progress made in the testing, evaluation, and correction of MSFC's 7.5 kW electron beam welder in support of space shuttle main engine component welding is summarized. The objective of this project was to locate and correct the deficiencies in the welder. Some 17 areas were deficient in the 7.5 kW ERI welding system and the associated corrective action was taken to improve its operational performance. An overall improvement of 20 times the original reliability was obtained at full rated capacity after the modifications were made.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-X-73390
    Format: application/pdf
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