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NUT RUNNERS
Page 76
Page 77
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WITH the increasing difficulty in obtaining good workshop staff the greater output required from the workshop can only be obtained by more mechanization. It is no longer acceptable to allow a fitter to spend a whole morning struggling with a set of axle U-bolt nuts, for the time involved not only affects the shop output but must also be reckoned as vehicle downtime. Power-operated and geared spanners have gained popularity in recent years; units available are covered in this review.
THE ARO CORPORATION (UK) LTD
Caernarvon, North Wales.
THE SEVEN air impact wrenches in the ARO range cover bolt sizes of *in. up to 11-in. All the wrenches are heavy-duty types.
Bolt capacities of the 8102-LC wrench are from +in. to gin., the square drive being gin. or lin. The wrench can be supplied with a On. hexagonal ball-lock adaptor and with 3in, and 4in, extension anvils. The 8102-APC-1 is a pistol-grip version of the 8102-LC and has the same specification. Having a bolt range of 4,,in./tin., and square drives of and iri., the 8103-PC wrench is available with Zin. hexagon ball-lock adaptor and 3in. and 6in. extension anvils.
A technical specification common to the 8106-S0 wrench and a pistol-grip version, the 8106-PC (each of which is equipped with a bail handle and a side handle) includes a bolt range of Zin./1in., tin. square drive and a choice of fin. hexagonal ball-lock adaptor and 3in. and 6in. extension anvils. In the case of the two versions of the 8110 wrenches, the 8110-PC is the pistol-grip type and the 8110-SC is the stirrup-grip model. The bolt range in each case is the square drive is of 1in. and there is a choice of a *in. hexagonal ball-lock adaptor, 1iin. spline drive and Sin, and 6in. extension anvils. Ball and side handles are standard to both models. 64, the rotating hammer is connected direct to the motor which stores up energy for the blow. This is transmitted to the anvil through an eccentric clutch jaw. The motor operates without a governor.
The five models have no-load speeds of 11,000 rpm, 10,700 rpm, 8,500 rpm, 4,750 rpm and 3,750 rpm respectively, the LMA 05, LMA 054 and LMA 20 producing 1,000 impacts/min. and the LMA 40 and LMA 64, 950 and 600 impacts/min. respectively. Both the LMA 05 and the LMA 054 have a torque-application range of 15/22 ft.lb. while the range of the LMA 20 is 30/100 ft.lb, The ranges of the LMA 40 and LMA 64 are 110/325 ft. lb. and 325/1,100 ft.lb. respectively. Weights vary between 2ilb. and 341b.
An adjustment device fitted to the LMA 05, LMA 20 and LMA 40 models provides for four, five Of six tightening torques depending on the model. The LMA 054 and LMA 64 have throttling nuts. The 793SH-6-99 is equipped with the company's 793SH-6 air wrench, LAthitworth sockets of lin.. lin. and +kin., 4/F sockets of 175;in. and 14-in, and a 1in. square drive. In the case of the 7935H-100 snd 793SH-98 Air-Karts, the 793SH air /wrench is employed. The 793SH-100 las Whitworth sockets of In., iin., lin. snd 1in., A/F sockets of Rin., I Ain. and and a lin. square drive, Whitvorth sockets of lin.. Nin., lin., din. and :in, are included in the 793SH-98 kit.
The CP734 Whippet air wrench has a iolt size of +in, and a 4-in. square drive Ind four kits are based on the model. It is lesigned as a general-purpose tool with a orque control that enables the operating orque to be pre-set. An angle head is irovided 'for jobs on normally inaccessible tuts and one version, the 734-2, has a extended shank and a -flip socket" hat enables the size to be changed from kin. hexagon to lin, hexagon, which can particularly useful when removing vheel nuts. The 734-32, 734-33 and '34-34 are supplied with six sockets of tin. A/F to -in. A/F, the 734-34 being the nodel supplied with a lock-on-angle head.
A more powerful model, the Titan 772, as a bolt size of lin. and a lin, square drive. t has a power regulator that provides for ipplications to cylinder-head nuts at one :nd of the scale and stubborn wheel and 1-bolt nuts at the other. The 772-6 version if the Titan has a built-in 6in. extension hank and the 772-6-73 kit has six sockets
ain. Whitworth to iin. Whitworth. A )ck-on angle head is a feature of the 72-72 kit which has a standard 772 air wrench, while the 772-75 kit has 10 ockets comprising six A/F lin. to 14-in. nd four Whitworth Ain. to lin. sockets.
One of the most powerful CP air wrenches, he Tork-Rite 793SH power-regulated nodel has a bolt-size of 11in, and a 1in. quare drive. It is said to be able to loosen he most stubborn wheel nuts of up to lin, bolt size and is particularly suitable Dr work on road springs and so on. It can
e supplied with a lock-on angle head.
Based on this model, the 793SH-94 it has a lock-on angle head and a set of five ockets together with a universal joint and 1in. to lin. adaptor. Features of the '93SH-6-91 kit include five sockets and a lin, extension bar, while the 793SI-1-93 it is based on the standard model and also as a lock-on angle head. The 793SH-97 it is supplied with a set of eight sockets, universal joint and a 6in. extension bar.
Also made for heavy-duty work, the '91-F Jumbo air wrench has a bolt size f 11in, and a 1in. square drive. It is availble with a 6in. extension shank, and with he extension fitted is particularly suitable Dr wheel-nut applications.
Intended for work on carburetters, lnition equipment, radiators, bodywork nd so on, the 720 Midget has a bolt size ,f lin. and a square drive of the same size. eatures include a power regulator, a utterfly throttle (that provides instant 3rward reverse action) and a lock-on angle ead. It weighs 21lb. flywheel, while the Plarad is a planetary geared torque-increasing unit designed for manual tightening.
The flywheel of the Collmann is driven by a set of seven V belts and the machine is mounted on a trolley with rubber tyres. It operates without clutch, brakes or gearing and is said to be capable of removing badly rusted nuts with the minimum of noise. According to the maker's description of the principle, the socket shaft is turned by the impact of the flywheel, which is rotatable in either direction. It is suitable for sockets of 17mm to 46mm or equivalent sizes in inches and weighs 100kg while the working level is adjustable from 240mm to 800mm. The motor is a three-phase unit developing 1.1 hp on a voltage of 220 or 380. The machine is available with a control system giving automatic loosening and tightening.
In standard form, the Collmann costs £275 while the cost of the automatic model is £324. Extras include a spotlight at £6 17s. and the 11 sockets in the range vary in price from £1 7s. for the iin. Whitworth/Ain. BSF socket to £6 10s. for the liin. Whitworth/1i-in. BSF socket.
The Plarad XV planetary-geared wrench provides a drive ratio of 12 to 1 and torques up to 3.600 ft.lb., direct drive being employed when increased torque is not required. In the case of the smaller Plarad XVK wrench the drive ratio is 6 to 1 and it can be used to apply a torque of up to 2,000 ft.lb. Both models are available with a ratchet.
The XV costs f4.4 10s.. while the XCK is priced at £22 105.
INGERSOLL-RAND CO LTD
165 Queen Victoria Street, London EC4.
AIR and electric impact wrenches are made by this company with bolt sizes up to 14-in. and torque ranges up to 600/1,400 ft.lb. A total of eight air wrenches is produced and seven electric wrenches.
The 401 and 402 wrenches have a maximum bolt size of fin. and a square drive of the same size. the torque ranges being 15/45 ft.lb. and 20/75 ft.lb. respectively. Average impacts per minute are 2,075 and 1,200 respectively and respective weights are 24-lb. and 441b. In the same category the 2U electric wrench has a bolt size of lin, and a square drive of tin., the torque range and impacts/min. being 50/75 ft.lb. and 2,100 respectively. The 401 can be supplied with a quick-change angle attachment and the 401 A3 kit has six sockets of On. to -in.
A maximum bolt size of and a square drive of 4-in, are features of the 403 B heavy-duty, 405 extra heavy-duty and 406 super-duty air wrenches, the torque range of the 403 B and the 405 being 75/200 ft.lb. and impacts-min. averaging 1.250 and 1,350 respectively. The torque range of the 406 is 75/250 ft.lb. while impacts/min. average 1,350.
Having the same bolt size and square
drive size (4in.) the W550 standard-duty 5U-HD heavy-duty and 5UT "torque
control" electric wrenches have torque ranges of 90/130 ft-lb., 90/130 ft. lb. and 20/90 ft.lb. respectively, while the impacts/ min. average 2.000, 1,900 and 1,600 respectively.
Features of the 4038 include a power regulator and this model together with the 405 and the three electric models is available in kits with six sockets of 4-in. to Rim hexagon. The 406 is specially recommended for heavy commercial vehicle work and can be supplied in kit form. Adjustable torsion bars are incorporated in the torque control system of the 5UT electric wrench which stops the tool when a pre-set torque is reached.
Large-capacity wrenches in the range comprise three electric types, the 8U, 8U-12 and the 34U and three air wrenches, the 411, the C435 and the 435. The maximum bolt sizes of the electric tools are fin., fin. and 1lin. respectively, the corresponding square drives being Pm, lin, and lin. Respective torque ranges are 175/250 ft.lb., 175/230 ft.lb. and 450/750 ft.lb. The 8U and the 8U-12 are available in kit form with four hexagonal sockets of fin. to 'Gin. Maximum bolt sizes of the air tools are lin., 1lin. and 1lin. respettively, while the corresponding torque ranges are 350/575 ft. lb., 600/1,400 ft.lb. and 600/1,400 ft. lb. respectively. Respective sizes of the square drives are ain 1in. and 1n.. the 435 being provided with an 8in. extension. The three models are equipped with a power regulator and the 411 can be supplied in kit form with four sockets of fin to 1lin. A wide variety of accessories is available.