ASME B107.18 pdf free download

ASME B107.18 pdf free download PLIERS: WIRE TWISTER
Wire twister ptiers shall incorporate a device, which,when actuated, wili cause the plers to rotate about itslongitudinal axis. The halves of the plers shall be perna-nently joined with a through fastener that shali act asthe pivot or fulcrum point of the pliers. A locking device,when engaged, shali hold the handles in a closed posi-tion in such a manner as to cause the jaws to firmly andsecurely grip and hold strands of loek wire.
A wire clearance openirg shall be provided betweenthe two jaws and located between the gripping andcutting areas of the jaws. This opening shall be of a sizeand design which will perut the user to swiftly andeasily deflect double strands of wire out af the sides ofe jaws and away fron the cutting edges when per-forming continuous (multiple) lock wiring operatians.The nose design shall be a5 shown in Figs 1 through 4and blerd with the radius of the sides of the pliers inaccordance with good conrerciai practice. The maxi-mun perinissible opening at the top of the jaws, whenclosed, shall be as shown in Figs. 1 and2
5.2 aterial
The rraterials used in the marufacture of the pliensshall be such as to produce pliers conforning to therequirements specified herein.
5.3 Fnish
Surfaces shall have a nust preventive treatnent andbe essentially free from pits, nodules, buTs, cracks, andother conditions that would adversely affect the per-formance or safety of the tool. When provided, coatingsshall be adherentsmooth, continuous,and free fromany conditions that would interfere with their protectivevalue, safety, and function.
5.4 Marking
Phers shall be marked in a plain and pernanent nan-ner with the manufacturer’s nane or with a trademarkof such known character that the source of manufactureand country of origin shall be readily determined.Mark-ing shall be as perEranert as the norral life expectancyof the pliers to which it is applied (providing the markedsurface has not been subjected to a fretting or abradingaction) and be capable of withstanding the cleaning procedurs rormally experienrced during its intended use.5.5 Handles
Handles shall have a hardness of 36 HRC to 50 HRC.shall be shaped to provide a comfortable handgrip, andshall be free fron rough edges and sharp corrLers.
5.6jaws
5.6.1 Hardness. Jaws shaill have a hardness of 361IRCto 50 HRC.The gripping portion of the jaws and wirecutter shal be heat treated to a hardness of 56 HRC to6A HRC. Jaw surfaces and edges shal not damage thewire being twisted.
5.6,2 Cushlon Grip Throat.Cushion grip throat whenprovided,shall grip and retain cut wire end. The cushiongrip throat shal be nonmetallc and capable of with-starding noraal use without deteriorating or rubbingoff and shall pass the solvert resistance tesi in para. 6.4Cushior grip throat shallrenain permanently attachedunder normal use.
s.7 Jolnt Fastener
The fastener shall have a hardness of 25 HRC to50HRC.
5.8Spir l Mechanlsm
The spiral mechanisn shalt be capable of producinga close, uniform twist in safety wire without binding ofor damage to the amrchanism. This mechanism shali bemounted between the handles of the pliers and shall bepermanently affixed to one haridle in such a poaitionthat the lorgitudinal axis of the mnechanism shal corre-spond to the langitudinal axis of the pliers. The mecha-nism, when achuated, shall cause pliers to rotate aboutits longitudinal axis in its intended directian(s). Fachfulactuation of the smechanjsm shall cause the pliersto make the following minimum nurnber of completerotations:
Jfor 6 in.(152 mm) size,2rotations (with auto-matic retun, 2 rotations)
(bfor 9 in. (229 mn) size,3 rotations (with automaticreturn,25rotations)
ffor 12 in.(305 amm) size,4rotations (with automaticreturn.31rotations) (iype u1l Reversibie, 3 rotations)