259 Каталог GEDORE 2014 Профессиональный слесарный инструмент и оборудование Стр.257

Каталог GEDORE 2014 Слесарный инструмент Стр. 257 0259 ENG Lab2u

GEDORE How is the torque measured The torque is calculated by multiplying the force "F" applied to the lever with the distance from the pivot point to the point of application "L" (length of the lever). Mathematically that is expressed as follows Torque MA Force F x Lever L a Working principle v Force F 20 newtons I The diagram shows dependencies of force F and lever L on the torque on the base of 2 examples. In order to determine the relevant torque we employ the formula MA F x L. (1) Ma F x L 20 N x 1 m 20 N-m (newton meters) (2) Ma F x L 20 N x 2 m 40 N-m (newton meters) This means that the actual torque applied to the screw changes if the hand's position on the wrench changes. Also applies for DREMASTER Handgrip with user aid Operable without inaccuracies DREMOMETER Type MINI - F In the DREMOMETER we got around the physical principle explained above using constructional cleverness. Irrespective of where you apply the force - whether it be in the middle of the handgrip or at another position ot the DREMOMETER whether it be with both hands or using an extension tube - the torque set by you is always achieved exactly - without shifts in value By virtue of an axial position of the pivot point and the output square drive the DREMOMETER is a tool which is operable without inaccuracies. By contrast to conventional torque wrenches this single lever enables tightening without shifts in the measured value and without actuation away from the handgrip adversely affecting the accurancy. Please note that most conventional torque wrenches can only be actuated at the middle of the handgrip because otherwise considerable shifts in value could occur. Do you want to play it safe Then choose DREMOMETER. The set torque (MxW) when using special spanners is determined along the following lines Ma x lw Lever bearing area Pivot point impact point IIIllll an 3- DREMOMETER TYPE MINI 279 DREMOMETER with spanners When the DREMOMETER is actuated with a special extension spanner the single lever mentioned above is no longer the case. The attached spanner alters the conditions to the extent that the pivot point is now situated outside of the output square drive and thus a so-called double lever acts upon the screw connection. That has the consequence that the hand's pressure "F" can now only be applied to the middle of the handgrip. Every other pressure point would inevitably lead to shifts in value. Set torque Our DREMOMETER and SE operate in accordance with the same principle. Here the position of the pivot point also shifts to the front. These wrenches must also be actuated at the middle of the handgrip. However if you are using our spanner end fittings then the setting torque does not have to be re-calculated on the basis of the below-specified formula. Keep the depth gauges in the certificate in mind. Note Do not use end fittings together with a DREMOMETER with integrated ratchet F Hand pressure MxW Set torque which has to be set on the scale of the DREMOMETER Ma Tightening torque used to tighten the screw or nut lw Distance from the middle of the square drive of the DREMOMETER to the middle of the handgrip lx Distance from the middle of the square drive of the DREMOMETER to the middle of the screw or nut (also called depth gauge end fitting) lx + lw L L w 257