ASME B107.18 pdf free download

ASME B107.18-2003 pdf free download.PLIERS: WIRE TWISTER.
Wire twister pliers shall incorporate a device, which, when actuated, will cause the pliers to rotate about its longitudinal axis. The halves of the pliers shallbe perma- nently joined with a through fastener that shall act as the pivot or fulcrum point of the pliers. A locking device, when engaged, shall hold the handles in a closed posi- tion in such a marner as to cause the jaws to firmly and securely grip and hold strands of lock wire. A wire clearance opening shall be provided between the two jws and located between the gripping and cutting areas of the jws. This opening shall be ofa size and design which will peroit the user to swiftly and easily deflect double strands of wire out of the sides of the jaws and away from the cutting edges when per- forming continuous (multiple) lock wiring operations. The nose design shall be as shown in Figs 1 through 4 and blend with the radius of the sides of the pliers in accordance with good comrumercial practice. The maxi- mum permnissible opening at the top of the jaws, when closed, shall be as shown in Figs. 1 and 2
5.2 Materlal , The materials used in the marufacture of the pliers shall be such a to produce pliers conforming如the requirements specified herein.
5.3 Finish Surfaces shall have a nust preventive treatment and be essentialy free from pits, nodules, burs, cracks, and other conditions that would adversely affect the per- formance or safety of the tool. When provided, coatings shall be adherent, smooth, continuous, and free from any conditions that would interfere with their protective value, safety, and function.
5.4 Marking Pliers shal be marked in a plain and peronanent man- ner with the manufacturer’s name or with a trademark of such known character that the source of manufacture and country of origin shall be readily determined. Mark- ing shall be as pernanent as the normal life expectancy of the pliers to which it is applied (providing the marked surface has not been subjected to a fretting or abrading action) and be capable of withstanding the deaning pro cedures normally experienced during is intended use.
5.5 Handles Handles shall have a hardness of 36 HRC to 50 HRC, shall be shaped to provide a comfortable handgnip and shal be free from rough edges and sharp comers.
5.6 Jaws 5.6.1 Hardness. Jaws shall have a hardness of36 HRC to 50 HRC. The gripping portion of the jaws and wire cutter shall be heat treated to a hardness of 56 HRC to 64 HRC. ]Jaw surfaces and edges shall not damage the wire being twisted. 5.6,2 Cushlon 6rIp Throat. Cushion gnip throat when provided, shafl grip and retain cut wire end. The cushion grip thrat shal be nonmetallic and capable of with- standing noral use without deteriorating or rubbing of and shall pass the solvent resistance test in para.6.4. Cushion grip throat shal renain permanently attached under normal use.
5.7 Joint Fastener The fastener shall have a hardness of 25 HRC to 50 HRC 5.8 Spinel Mechanlsm The spiral mechanism shall be apable of producing a dlose, uniform twist in safety wine without binding of or damage to the mrchanism. This mechanism shall be mnounted between the handles of the pliers and shall be permnanently affixed to one handle in such a position that the longitudinal axis of the mechanism shal come spond to the longitudinal axis of the pliers. The mecha- nism, when achuated, shall cause pliers如rotate about its longitudinal axis in its intended direction(s). Fach full actuation of the mnechanism shall cause the pliers to make the following minimum nunber of complete rotabions: (a) for6 in. (152 mm) size, 2% rotations (with auto- matic return, 2 rotations) (b) for9 in. (229 mm) size, 3 rotations (with automatic retum, 2’5 rotations) ic) for 12 in. (305 mm) size, 4 rotations (with autonatic retum, 3h rotations} (Type u Reversible, 3 rotations) The design of the mechanism shall permnit a comfort- able, adequate grip by the operatDt.ASME B107.18 pdf download.