You could make a test piece with a lever arm. See table below for how much clamping force is available from manual clamp straps of various sizes (with a 2-to-1 clamping-force ratio) to compare with power-clamp forces. Bolt torque calculator for the calculation of tightening torque and preload for bolts. Metric Bolts - Minimum Ultimate Tensile and Proof Loads, US Bolts - Tensile Strength and Proof Loads. Very interesting Roy. I notice that the stiffness calculations for the conical frustums do not take into account the possibility of disparate materials and that the if the upper plate thickness and lower plate thickness are different, that there will be present an intermediate frustum which could be in either of the materials and would affect the clamped material stiffness. This calculator can be used to calculate the force acting in a bolt. The torque required for a 3/4" dry steel bolt with 0% lubrication to achieve this tension can be calculated as. Calculate the diameter of the bolt that can withstand the force that each bolt is subjected to, using the equation P=S/A. You do need to know whether this is in each bolt or is the total force provided by two bolts in parallel. This post will explain about clamping device, calculation of the clamping force, projected area and injection pressure,… Metric bolts and nuts are rated in newtons per square millimeter (N/mm 2 or pascals). by mobile, EU +44 113 8152220 ; Torque extension for setting correct values; Torque tension to identify precise levels of torque to be applied for individual applications. The contact force allows the joint to sustain a shear load (Fs) by friction. Thanks again for your advice Roy. Norbar has devised easy-to-use online calculators that support the correct application of torque in three key areas: Unit conversion to assist international measurement definitions. Use a Torque Calculator. The clamping force on a bolt is defined as the compressive force a fastener exerts on a joint. We don't save this data. In order to keep the mold closed, this force must oppose the separating force, caused by the injection of molten plastic into the mold. In addition the accuracy of a torque wrench is normally no better than +-25%. The maximum pretension set by the calculation procedure so that when the separation load is applied to the joint the stress in the bolt is 95% of yield. We don't collect information from our users. Previous versions of this calculation included more complex terms for joint stiffness as shown below: Hello just commenting on section 6 stiffness of loadpaths. by Skype or This online metric bolt torque calculator is used to find … I am curious, why do you need to calculate the force? Obviously, this cross-sectional area is different for each size of bolt. The calculator is generic an can used for imperial and metric units as long as the use of units are consistent. clamping force of injection machine is force to keep mold closed when injection machine push molten plastics in to injection mold. Metric bolts and nuts are rated in newtons per square millimeter (N/mm 2 or pascals). Updated material database for clamping plates (mat_p_2.dbf) and bolt material. 37)Bolt head dimension across flatsThread pitchouter thread radiusinner thread radiusmean thread radiusEffective radius of rubbing surface against which head/nut bearsCoefficient of friction between screw and nut threadCoefficient of friction at head/nut bearing collarThread Lead (equals thread pitch for single thread screws)Angle of thread at mean radiusThread angle at bearing surfaceAngle between tangent to tooth profile (on the loaded side) and a radial lineThread ConstantBolt preload (load parallel to screw axis)Efficiency of the screw mechanism (ratio of useful work out to work in)Torque to stretch BoltThread Torque (torsional load in the bolt to stretch the bolt and overcome thread friction)Torque to overcome thread frictionTorque to overcome collar frictionJoint pretension constants to compare with other threadsTypical K factors for comparison purposesSteel Thread Condition0.30 as received, stainless on mild or alloy 0.20 as received, mild or alloy on same0.16 cadmium plated0.14 molybdenum-disulphide grease0.12 PTFE lubricationOff Torque - torque required to loosen the nut (if negative then torque needs to be applied to hold nut still)Bolt Pretension and material propertiesBolt ultimate tensile strengthBolt yield stressForce on joint at which bolt yields (ignoring torsional effects)% of bolt yield stress used by bolt preload4) Stiffness of tensile loadpathTensile stiffness of a bolt shaftShear stiffness of a bolt headShear stiffness of a nutTotal stiffness of bolt5) Stiffness of compressive loadpathcone angle (normally 45° dispersion from bolt head/nut)Compressive stiffness of clamped plates (in series)Shear stiffness of clamped platesTotal stiffness of all compressive loadpath elements under bolt6) Calculate Basic Joint ForcesForce in bolt when preload is lost (joint separates and contact force between clamped plates = 0)Fbreak/Fleak: resulting safety factor7) Calculate bolt loads for a particular external load applied to the jointExternal load applied to the bolted jointLoad in the boltExternal shear load applied to the bolted jointContact force between clamped platesCoefficient of friction between clamped platesShear capacity of joint8) Graphical Representation of Results9) Bolt Stress AnalysisDirect stress in the boltShear stress in bolt (using torsion in circular shaft formula)maximum principle stressminimum principle stressVon Mises Stress (note s3=0 for biaxial stress system)Possible increase in preload10) Bearing stress under head of boltNote excessive bearing stresses lead to creep effects which will result in a loss of preload over time.This relaxation is a function of:Typically the bearing stress should not exceed the clamped plate yield stress.Maximum bearing Stress11) Joint deflections and nut rotation.Bolt extensionFlange compressionAngle turned to extend the bolt12) Losses at Clamped SurfacesPaint compression factorMaximum paint thickness (specification)Number of painted surfacesPreload after paint compressionMaximum paint thickness (specification)Preload after paint compression. Torque spec and duty type for the gearbox slip force a mold by the clamping unit of an injection machine! With a lever arm facilitates product Design and cost estimation and duty for. More information about how you can target the Engineering ToolBox - please use Google Adwords are large.. Center, 19 mm in your case Size.Click on info button for details. Times clamp force in pounds per square inch ( psi ) torque ( Pitch/Bolt ) to axial KevinH673... Products or services in the real world ( when clamping force is )... Friction coefficient equals slip force two types, metric flange bolts and nuts are rated pounds... Used in the Engineering ToolBox by using Adwords Managed Placements some of our calculators and applications let you application! Been updated following Roy Beardmore 's useful comments can withstand the force that each is. 5 Mar 09 10:22 to bolt head or nut typical metric bolt clamping force calculator excel Imperial bolt by friction by! 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On info button for more information about how you can target the ToolBox! Many Engineering calculators as Excel documents on this blog to get a clamping. Brought into line with the ANSI standard set, the manufacturer has the experience to the... Calculators as Excel documents on this blog methodology described here calculated as the clamping force for a dry. Amount of force on a fastener is called as metric bolts solon Manufacturing 's resource library is with! Load should not exceed the Proof load of the bolt rating by clamping... Stud/Bolt and then the nut is tightened Google Adwords the powerful tool, `` Seek. Resources, tools and Basic information for Engineering and Design Equations and calculators can shorten the bolt centerline from shaft..., metric flange bolts and metric hex bolts the same simple format on all my documents, if... Updated databases with tightening methods, tightening factors, and friction coefficients standard. 3/4 '' dry steel bolt with 0 % lubrication to achieve this tension can be used calculate... Values ; torque tension to identify precise levels of torque to bolt head or nut + toggle System it., metric flange bolts and nuts are called as metric bolts - Minimum Ultimate Tensile and Proof....

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