Tolerance variations between the hermetic seal and ma-. SMK Solder Type Straight Plugs For Semi-rigid Cable 1 2 3 4 2 3 5 6 1 2 3 4 6 Bead Assy. The SMA RF Connector and Associated Tools Whitham D. The SMA’s original design was based on using 0.141 in diameter semi-rigid cable in a system that. SMA RF Connector Specifications and Interface Dimensions. Using a threaded interface, SMA 5. Ohm connectors are semi- precision units that provide excellent electrical performance from DC to 1. GHz and outstanding mechanical durability. SMA connectors feature stainless steel or brass construction and . Built in accordance with MIL- C- 3. CECC 2. 21. 10/1. SMA connectors can be mated with all connectors that meet these specification mating diameters regardless of manufacturer. Related Products. SMA Adapters. SMA Accessories. Features and Benefits. Light weight, compact and vibration proof design. Low cost commercial grade (Brass SMA) available in nickel or gold plating Terminates to all standard flexible coaxial cables, low- loss (LMR) type cables and industry standard semi- rigid and conformable cables. Applications. Base stations. Antennas. Telecommunications. Instrumentation. PC/LANSMA Specifications. Coaxial cable, or coax (pronounced / . Many coaxial cables also have an. Micro-Coax offers a full range of coaxial cable solutions. Today, we are the world’s largest manufacturer of semi-rigid cable and they are available in bulk or for custom. Base stations; Antennas.141' &.085' O.D. Copper Jacket Semi-Rigid Cable: 0-18 GHz: Flexible. A leading cable manufacturer for over 50 years, Micro-Coax specializes in coaxial cable, cable assemblies. Direct solder attachment of connectors to semi-rigid cable. ![]() Electrical Impedance. Ohm. Frequency Range . Copper Jacket Semi- Rigid Cable. GHz. Flexible Cables. GHz. Voltage Rating RG- 5. RG- 1. 22, 1. 74, 1. Dielectric Withstanding Voltage (max.) . Copper Jacket Cable. GHz)RG- 5. 5 Group. GHz)RG- 1. 22 Group. GHz)RG- 1. 78 Group. GHz)VSWR for Angle Connectors . Copper Jacket Cable. GHz)RG- 5. 5 Group. GHz)RG- 1. 22 Group. GHz)RG- 1. 78 Group. GHz)Insulation Resistance. M. B) except at high temp test @ + 2. B) 5% salt solution. Vibration. MIL- STD- 2. Method 2. 04 (test cond. D)Shock. MIL- STD- 2. Method 2. 13 (test cond. I) No Discontinuity Permitted. Moisture Resistance. MIL- STD- 2. 02 Method 1. Weatherproofing Crimp Typeheat shrink tubing. Solder Type. Silicone rubber gaskets. Altitude. MIL- STD- 2. Method 1. 05 (test cond. C), no corona at 7. Min., 3. 00. N. cm. Torque. 15. 7. 6 N. Jacks. N/AReverse Polarity SMA Specifications. Electrical Impedance. Ohm. Frequency Range Semi- Rigid. GHz Flexible Cables. GHz. VSWR Straight Connectors: . B)Corrosion. Mil- STD- 2. Method 1. 01, Condition BVibration. Mil- STD- 2. 02, Method 2. Condition BMechanical Mating. Cable Affixment. Crimp or solder types. Center Conductor. Solder. Cable Retention. Interface Dimensions. Bending tool - GTE Laboratories Incorporated. BACKGROUND OF THE INVENTION1. Field of the Invention This invention relates to bending tools, and, in particular, to bending tools for semi- rigid coaxial cable. Accordingly, it is a general object of this invention to provide new and improved tools of such character. Description of the Prior Art Previously, semi- rigid coaxial cables were bent around any cylindrical object of the approximate size needed. Disadvantageously, this tended to produce flattened areas on the coaxial cables, causing transmission line discontinuities. The semi- cylinder has two sets of grooves for pipes of various gages. The pillar is reversible, with two sets of grooves corresponding to those in the semi- cylinder. Pardue, Jr., et al., U. S. 2,7. 96,9. 10, discloses a pipe bending machine including a cone- shaped bending die, and means for forcing a pipe to be bent into a die bed or insert therein. The bending die is provided with three groups of circumferentially spaced die beds or grooves, each bed extending circumferentially about the conical die through an arc of ninety degrees. Thus, at any given radius of turn, the die bed of each group has a different diameter bed from the other two beds. Insert shoes are releasably secured in the beds. SUMMARY OF THE INVENTIONAnother object of this invention is to provide a new and improved bending tool for semi- rigid coaxial cable, the use of which tool avoids the introduction of flattened areas onto such cable. Still another object of this invention is to provide a new and improved bending tool for semi- rigid coaxial cable, which tool is unitary, can be inexpensively manufactured, and can be used for providing multiple radii bends to coaxial cables of different diameters. Yet another object of this invention is to provide a new and improved tool for semi- rigid coaxial cable, which tool selectively can be firmly hand held or securely held in a vise. In accordance with one aspect of this invention, a coaxial cable bending tool includes a mandrel around which a semi- rigid coaxial cable may be bent or otherwise shaped. The mandrel, which extends along a fixed path, has an enlarged base portion adapted to be held to provide stability thereto. The mandrel includes a series of superimposed cylindrical portions of gradually diminishing diameters along the path. Each of the cylindrical portions is formed with a circumferential groove. With certain features of the invention, the fixed path is along a linear axis of the mandrel. Each circumferential groove has a like width and a like depth to another of the grooves. The base portion can include opposed flats formed thereon to provide stability in the event the base portion were to be held in a vise. The base portion includes a knurled surface to provide for stability in the event the base portion were to be hand held. With other features, each groove is defined by a first respective portion including opposed sidewalls spaced apart a fixed width, the opposed sidewalls being parallel to a fixed depth, each groove being further defined by a second respective portion coupled to respective sidewalls to form, in cross- section, a joining semi- circular bed having a radius equal to one- half the width. In accordance with another aspect of the invention, a mandrel for semi- rigid coaxial cables is set forth as an article of manufacture. The mandrel has an enlarged, generally cylindrically shaped support portion. The support portion has opposed flats formed thereon to provide for stability in the event the support portion were to be secured in a vise. Further, the support portion is formed with a knurled surface about its cylindrical periphery to provide for stability in the event the support portion were to be hand held. The mandrel includes a series of superimposed cylindrical portions of gradually diminishing diameters along one direction of a linear axis along which the mandrel extends. The mandrel includes a second series of gradually diminishing diameters along the opposite direction of the linear axis. Each cylindrical portion is formed with a circumferential groove. Each groove of the first series has a like width and a like depth as another groove of the first series. Each groove of the second series has a like width and a like depth as another groove of the second series. The like width of each groove of the first series is not equal to the like width of each groove of the second series. Likewise, the like depth of each groove of the first series is not equal to the like depth of each groove of the second series. In accordance with certain features of the invention, the dimensional relationships are such that the like width of each groove of the first series is w, the like depth of each groove of the first series is d, the like width of each groove of the second series is W, and the like depth of each groove of the second series is D, wherein 2d> w and 2. D> W. Each groove of the first series is defined by a first respective portion including opposed sidewalls that are parallel to a depth of (d- w/2) and a second respective portion coupled to the sidewalls to form, in cross- section, a joining semi- circular bed having a radius (w/2). Each groove of the second series is defined by a third respective portion including opposed sidewalls that are parallel to a depth of (D- W/2), and a fourth respective portion coupled to the sidewalls to form, in cross- section, a joining semi- circular bed having a radius (W/2). With certain features, w is equal to 0. W is equal to 0. 0. D is equal to 0. 0. FIG. 2 is an end view of the tool depicted in FIG. FIG. 3 is an enlarged fragmented view of a portion of the tool depicted in FIG. FIG. 1 and 2, there is depicted a bending tool 1. The tool 1. 0 is shown in plan view in FIG. FIG. The tool 1. 0, in one mode constructed by the inventor, was formed of a two inch aluminum rod. Other solid materials can be used, conditioned upon the material's strength, durability, cost, and machinability. The tool 1. 0 is designed to facilitate bends of semi- rigid coaxial cable with minimal effort and with minimal damage to the cable. The tool 1. 0 is used as a mandrel. A mandrel, as defined by Webster's New International Dictionary of the English Language Second Edition, includes a metal bar, used as a core around which metal or other material may be cast, molded, forged, bent, or otherwise shaped. As used herein, however, the term mandrel is defined broadly to include both a metal bar and a non- metallic bar, and can include synthetic material bars of plastic and ceramic. Preferably, the mandrel is a sturdy bar used as a core around which semi- rigid coaxial cable may be bent or otherwise shaped. The tool 1. 0 has a centrally located, enlarged, generally cylindrically shaped support portion 1. The tool 1. 0 is symmetrical about a linear axis 1. The support portion 1. To facilitate stability when secured in a vise (not shown), the tool 1. The mandrel 1. 0 is formed with a first series of superimposed cylindrical portions 2. The mandrel 1. 0 is formed with a second, unlike series of superimposed cylindrical portions 3. FIGS. Each cylindrical portion 2. Each groove 2. 5, 2. FIG. Each cylindrical portion 3. Each groove 3. 5, 3. FIG. As indicated in the drawing, the like widths and like depths of the first series of grooves 2. In a preferred mode, considered suitable for bending of both 0. The width W of each of the grooves 3. D of each of the grooves 3. The width of a groove should be less than (but can be equal to) twice the depth thereof. Each of the grooves 2. FIG. 3, includes a first respective portion including opposed sidewalls 4. FIG. 3), a joining semi- circular bed having a radius (w/2). The first portion distance, in the example set forth above, is 0. Each of the grooves 3. FIG. 4, includes a third respective portion including opposed sidewalls 5. D- W/2), and a fourth respective portion 5. FIG. 4), a joining semi- circular bed having a radius (W/2). The third portion distance, in the example set forth above is 0. The width of each of the grooves 2. The width of each of the grooves 3. The reasons why the width of a groove is larger than the diameter of a cable are to provide both for differences in tolerances of both cable and tool manufacture, and to provide for the expansion or deformation of a cable while being bent. A typical semi- rigid coaxial cable, suitable for use with the bending tool of this invention, has a bare center copper conductor and an outer, solid, thin walled, copper tube. In summary, the tool 1. Alternatively, the tool 1. A large diameter cable can be bent about any of the grooves 2. A smaller diameter cable can be bent about any of the second series of grooves 3. The grooves can be provided upon the bending tool by various methods including milling. Whereas, in the past, the bending of a semi- rigid coaxial cable about a cylindrical surface yielded a flattened area on the coaxial cable producing a variety of transmission line problems, the provision of carefully milled grooves obviates the problems of the past by uniformly distributing pressure on the cable during bending.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
December 2016
Categories |