The reef knot, or square knot, is an ancient and simple binding knot used to secure a rope or line around an object. It is sometimes also referred to as a Hercules knot or Heracles knot.Weight for weighing gold dust - Knot MHNT.
The purpose of this NASA Technical Standard is to set forth requirements for interconnecting cable and harness assemblies that connect electrical, electronic or electromechanical components. See full list on s3vi.ndc.nasa.gov The documents listed in this section contain provisions that constitute requirements of this Standard as cited in the text. Use of more recent issues of cited documents may be authorized by the responsible Technical Authority. The applicable documents are accessible via the NASA Standards and Technical Assistance Resource Tool at http://standards.... See full list on s3vi.ndc.nasa.gov This Standard establishes requirements for (enter specific purpose from Scope) but does not supersede nor waive established Agency requirements found in other documentation. Conflicts between this Standard and other requirements documents shall be resolved by the responsible Technical Authority. See full list on s3vi.ndc.nasa.gov The following acronyms apply to terms used in this Standard. AC ASTM Alternating Current American Society for Testing and Materials AWG CVCM DC DWV EMI ESD ESDS FEP GHz GSFC IR JPL NASA NASA-STD NPR OD PET PTFE PVDF RF RFI RH RMS SDS American Wire Gage Collected Volatile Condensable Material Direct Current Dielectric Withstanding Voltage Electromag... See full list on s3vi.ndc.nasa.gov Either precision mechanical tools or thermal strippers shall be used for insulation stripping. Thermal strippers shall have variable temperature control. The tools shall not nick, ring, gouge, or stretch conductors or remove plating so that the base metal shows. Superficial scraping of conductors is acceptable providing conductor base materi... See full list on s3vi.ndc.nasa.gov Installation stress and final lay (e.g., ease of bending, flexibility in twisting, stress relief). Electrical isolation. Ability to fit into confined spaces or near or around mechanical edges. Thermal management. Current and voltage derating. Voltage drop. Repairability and reliability (e.g. redundancy, not using connector contact locations, spare ... See full list on s3vi.ndc.nasa.gov Use of constraints that locate similar connectors built into interconnecting cables and harnesses so they cannot be interchanged. Selection of different sizes for connectors to be located adjacent to each other. Polarization or dissimilar keying of adjacent, similar connectors. Ensure clarity in marking and coding connectors. Use of confidence loop... See full list on s3vi.ndc.nasa.gov Lockstitching shall terminate with a closing stitch before each large breakout or branch of the harness. The lacing shall start anew with a starting stitch on the opposite side of the breakout on each branch. See full list on s3vi.ndc.nasa.gov They shall be uniformly shrunk to assure a tight fit where required. The part shall be positioned according to drawing or specification requirements. The shrinkable sleeving shall firmly grip the item over which it has been installed. The shrinkable part shall be free of cracks, punctures, blisters, and burned areas. See full list on s3vi.ndc.nasa.gov After removal of the insulation segment, the remaining conductor insulation shall not exhibit any damage such as nicks, cuts, crushing, or charring. Conductors with damaged insulation shall not be used. Scuffing from mechanical stripping or slight discoloration from thermal stripping is acceptable. After removal of the conductor insulation,... See full list on s3vi.ndc.nasa.gov Cracks in the plating or base metal. Tarnishing or discoloration of the plating. Plating removal or flaking. Out-of-roundness of the wire well entrance. Exposed base metal. See full list on s3vi.ndc.nasa.gov Full-Cycle Ratcheting. Crimp tools shall contain a full-cycle ratcheting mechanism which shall prevent the indenters from releasing before the crimp cycle has been completed. Number of Indenters. Each crimp tool shall have four or more indenter blades (preferably double-indenter blades). Calibration Adjustments. The calibration adjustments shall... See full list on s3vi.ndc.nasa.gov Note: CAUTION: WHERE SOLDER CONTACTS HAVE FLOAT, FLUX MAY RUN DOWN ONTO THE MATING SURFACE OF THE CONTACT DURING SOLDERING AND CAUSE INTERMITTENT AND OPEN CIRCUITS. See full list on s3vi.ndc.nasa.gov Note: Care should be used when using shrink sleeving. The outer diameter of the sleeving should be small enough to allow use of extraction/insertion tools. See full list on s3vi.ndc.nasa.gov Note: CAUTION: CARE SHOULD BE EXERCISED WHEN POSITIONING AND TORQUING CONNECTOR BACKSHELL TONGS, STRAIN RELIEF CLAMPS AND OTHER STRAIN RELIEF MEMBERS. THE PROPER POSITIONING OF THESE DEVICES WILL PREVENT THE SHARP BENDING OF AND SUBSEQUENT DAMAGE TO HARNESSES DURING THEIR INSTALLATION OR OPERATIONAL USE. See full list on s3vi.ndc.nasa.gov Many types of RF connectors and coaxial contacts are available. Electrical performance, together with other considerations, affects the selection of the connector and coaxial cable. Depending on the requirements, assembly procedures vary from normal shop practice for cables operating at less than 1 gigahertz (GHz) to precision techniques for thos... See full list on s3vi.ndc.nasa.gov The identification marking shall be capable of passing all environmental testing that may be required for the projected use and remain legible. Each connector shall be identified. Connector identification may be placed directly on the connector or on the cable near the connector. In all cases, identification shall resist abrasion, either as a... See full list on s3vi.ndc.nasa.gov Assurance of cleanliness shall be an ongoing effort. Practices for mission assemblies shall include assembly in a clean environment and the use of protective plastic sheeting or other coverings over harnesses not undergoing active assembly. See full list on s3vi.ndc.nasa.gov Solvent cleaning by brushing or vacuum methods may be used Flux residue, solder splash, metal flakes, moisture, and other contaminants that may jeopardize the integrity of the connector system shall be cleaned from contact surfaces of pins, sockets, and connector bodies (see Figure 15-1). Crimp-type multipin and coaxial electrical connectors shal... See full list on s3vi.ndc.nasa.gov Verification that the circuit has been de-energized shall be performed prior to connector mate and demate operations (not applicable to circuits containing batteries). Prior to mating, connectors shall be examined for contamination, and pin, socket, grommet and connector body damage. All flight qualified, AC/DC power interface and test equipment co... See full list on s3vi.ndc.nasa.gov Note: CAUTION: THERE SHOULD BE NO RELATIVE MOTION OF THE CABLES OR THE CONNECTOR BODIES WHILE THE CONNECTOR IS BEING TORQUED. See full list on s3vi.ndc.nasa.gov Splices may be configured as a simple splice, having one conductor joined to another conductor, or as a complex splice with one or more conductors joined to one or more other conductors. Splices may be completed using crimping or soldering processes. See full list on s3vi.ndc.nasa.gov Solder-style splices are primarily designed for the termination of a single conductor to a single conductor, but may be used for the termination of multiple conductors (i.e., a branch or fan-out circuit), providing the splice design is appropriately configured/sized to accommodate all the conductors without modifications. Solder-style splices prod... See full list on s3vi.ndc.nasa.gov Solder ferrule splices shall only be fabricated as an end splice. The ferrule selected for use shall fit over the inserted tinned wires, but not over the wire insulation with a maximum insulation clearance equal to the diameter of the ferrule. The minimum insulation clearance shall ensure that insulation does not interfere with the natural formatio... See full list on s3vi.ndc.nasa.gov Crimping wires into contacts or crimp ferrules is a method for splicing wires together without soldering. When crimping multiple wires into a contact or ferrule, the total circular-mil-area (CMA) of all the wires must be calculated into an Equivalent Wire Size (EWS) in order to select the properly sized contact or ferrule. See full list on s3vi.ndc.nasa.gov Verify that all tests, inspections, and measurements, including contact retention tests, specified by this document have been performed. Verify that all personnel who assemble or inspect hardware in accordance with this document have been trained and certified to the applicable requirements herein. Use in-process surveillance of all assembly operat... See full list on s3vi.ndc.nasa.gov This appendix provides information about problem areas and failures that result from poor connector design, faulty assembly instructions, or wrong choice of materials for certain types of coaxial cable assemblies. B.1.1 Plastic Jacket Layer in the Compression System. Certain manufacturers' RF-connector designs or assembly instructions allow the ja... See full list on s3vi.ndc.nasa.gov This appendix provides information about problem areas and failures that result from poor connector design, faulty assembly instructions, or wrong choice of materials for certain types of coaxial cable assemblies. B.1.1 Plastic Jacket Layer in the Compression System. Certain manufacturers' RF-connector designs or assembly instructions allow the ja... See full list on s3vi.ndc.nasa.gov This appendix provides information about problem areas and failures that result from poor connector design, faulty assembly instructions, or wrong choice of materials for certain types of coaxial cable assemblies. B.1.1 Plastic Jacket Layer in the Compression System. Certain manufacturers' RF-connector designs or assembly instructions allow the ja... See full list on s3vi.ndc.nasa.gov This appendix provides information about problem areas and failures that result from poor connector design, faulty assembly instructions, or wrong choice of materials for certain types of coaxial cable assemblies. B.1.1 Plastic Jacket Layer in the Compression System. Certain manufacturers' RF-connector designs or assembly instructions allow the ja... See full list on s3vi.ndc.nasa.gov This appendix provides information about problem areas and failures that result from poor connector design, faulty assembly instructions, or wrong choice of materials for certain types of coaxial cable assemblies. B.1.1 Plastic Jacket Layer in the Compression System. Certain manufacturers' RF-connector designs or assembly instructions allow the ja... See full list on s3vi.ndc.nasa.gov This appendix provides information about problem areas and failures that result from poor connector design, faulty assembly instructions, or wrong choice of materials for certain types of coaxial cable assemblies. B.1.1 Plastic Jacket Layer in the Compression System. Certain manufacturers' RF-connector designs or assembly instructions allow the ja... See full list on s3vi.ndc.nasa.gov This appendix provides information about problem areas and failures that result from poor connector design, faulty assembly instructions, or wrong choice of materials for certain types of coaxial cable assemblies. B.1.1 Plastic Jacket Layer in the Compression System. Certain manufacturers' RF-connector designs or assembly instructions allow the ja... See full list on s3vi.ndc.nasa.gov This appendix provides information about problem areas and failures that result from poor connector design, faulty assembly instructions, or wrong choice of materials for certain types of coaxial cable assemblies. B.1.1 Plastic Jacket Layer in the Compression System. Certain manufacturers' RF-connector designs or assembly instructions allow the ja... See full list on s3vi.ndc.nasa.gov This appendix provides information about problem areas and failures that result from poor connector design, faulty assembly instructions, or wrong choice of materials for certain types of coaxial cable assemblies. B.1.1 Plastic Jacket Layer in the Compression System. Certain manufacturers' RF-connector designs or assembly instructions allow the ja... See full list on s3vi.ndc.nasa.gov This appendix provides information about problem areas and failures that result from poor connector design, faulty assembly instructions, or wrong choice of materials for certain types of coaxial cable assemblies. B.1.1 Plastic Jacket Layer in the Compression System. Certain manufacturers' RF-connector designs or assembly instructions allow the ja... See full list on s3vi.ndc.nasa.gov This appendix provides information about problem areas and failures that result from poor connector design, faulty assembly instructions, or wrong choice of materials for certain types of coaxial cable assemblies. B.1.1 Plastic Jacket Layer in the Compression System. Certain manufacturers' RF-connector designs or assembly instructions allow the ja... See full list on s3vi.ndc.nasa.gov This appendix provides information about problem areas and failures that result from poor connector design, faulty assembly instructions, or wrong choice of materials for certain types of coaxial cable assemblies. B.1.1 Plastic Jacket Layer in the Compression System. Certain manufacturers' RF-connector designs or assembly instructions allow the ja... See full list on s3vi.ndc.nasa.gov This appendix provides information about problem areas and failures that result from poor connector design, faulty assembly instructions, or wrong choice of materials for certain types of coaxial cable assemblies. B.1.1 Plastic Jacket Layer in the Compression System. Certain manufacturers' RF-connector designs or assembly instructions allow the ja... See full list on s3vi.ndc.nasa.gov This appendix provides information about problem areas and failures that result from poor connector design, faulty assembly instructions, or wrong choice of materials for certain types of coaxial cable assemblies. B.1.1 Plastic Jacket Layer in the Compression System. Certain manufacturers' RF-connector designs or assembly instructions allow the ja... See full list on s3vi.ndc.nasa.gov This appendix provides information about problem areas and failures that result from poor connector design, faulty assembly instructions, or wrong choice of materials for certain types of coaxial cable assemblies. B.1.1 Plastic Jacket Layer in the Compression System. Certain manufacturers' RF-connector designs or assembly instructions allow the ja... See full list on s3vi.ndc.nasa.gov This appendix provides information about problem areas and failures that result from poor connector design, faulty assembly instructions, or wrong choice of materials for certain types of coaxial cable assemblies. B.1.1 Plastic Jacket Layer in the Compression System. Certain manufacturers' RF-connector designs or assembly instructions allow the ja... See full list on s3vi.ndc.nasa.gov This appendix provides information about problem areas and failures that result from poor connector design, faulty assembly instructions, or wrong choice of materials for certain types of coaxial cable assemblies. B.1.1 Plastic Jacket Layer in the Compression System. Certain manufacturers' RF-connector designs or assembly instructions allow the ja... See full list on s3vi.ndc.nasa.gov View all This page describes and illustrates recommended procedures for lacing and tying wires with knots that hold tightly under all conditions. For the purposes of this discussion, the following terms are defined: Good workmanship shows up in lacing and binding done with the skill and neatness that prove pride in workmanship. This is one place where you can't count on a coat of paint to hide a poor job. 2. PURPOSE OF LACING AND BINDING. This is done using waxed cord or flat lacing tape, often made of nylon or polyester. Where most people reach for plastic or Velcro zip ties to do this job, Ive found that spending some time to use string is quite enjoyable. This chapter describes and illustrates the recommended procedures for harnessing, lacing and tying wire groups or bundles, using knots which will hold tightly under all conditions; and for installing self-clinching plastic cable straps. Calculate how different knots reduce rope breaking strength. Enter rope specs and knot type to find effective strength, working load limit, and safety margins.
As we can see from the illustration, Knot Linear Weight For Lacing Compression has many fascinating aspects to explore.
Fourth of five different lacing methods on Guy's shoes. Finished off with Ian's Secure Shoelace Knots. Photo 2180.More details on the Technical Info page. This extra security is fast becoming indispensable as more and more shoes nowadays are sold with round, slippery laces.
Explanation: For the design of laced columns: I) The thickness of the lacing flat for a single lacing system should be not less than 1/40 of its ef.V) The lacing for compression members should be proportioned to resist transverse shear equal to 2.5% of the axial force in the column.
As we can see from the illustration, Knot Linear Weight For Lacing Compression has many fascinating aspects to explore.
