Total stiffness of all compressive loadpath elements under bolt 6) Calculate Basic Joint Forces Force in bolt when preload is lost (joint separates and contact force between clamped plates = 0) Fbreak/Fleak: resulting safety factor 7) Calculate bolt loads for a particular external load applied to the joint External load applied to the bolted joint Bolt torque calculator for the calculation of tightening torque and preload for bolts. This calculator will request information such as the coefficient of friction, the bolt strength and diameter. 2) Total clamp force times friction coefficient equals slip force. This fastener bolt torque calculator will Estimate the unknown torque, diameter, axial force applied and coefficient of turning friction for the given conditions. Some of our calculators and applications let you save application data to your local computer. As the clamping force is a linear function of both the turning angle of the screw and the pitch of the thread, there is a direct relation between the clamping force and the tightening torque within the elastic range of the screw elongation. Typical Metric and Imperial bolt torques are indicated in the links below: Manufacturing data should always be checked before use. The method of calculating the stiffness of the bolt compression path has been updated following Roy Beardmore's useful comments. Where, Kj – joint spring rate. - be aware that this is a rough calculation where the screw pitch is not included. The required clamping force can be calculated from the cavity pressure inside the mold and the shot projected area, on which this pressure is acting. 5/16" -18 3/8"-16 1/2"- 13 5/8"-11 3/4"-10 10,000 9,000 8,000 7,000 6,000 5,000 4,000 3,000 2,000 1,000 0 SAE Grade 2 Bolts SAE Grade 5 Bolts SAE Grade 73 SAE Grade 84 Tensile Size Bolt Stress Tensile Proof Clamp2 Tensile Proof Clamp2 Clamp2 2 Dia. This is way above what the bolt can handle and fatal failure is likely. See the instructions within the documentation for more details on performing this analysis. There are variables that affect the clamping force calculation, like the material type (low-flow versus high-flow plastic), and the depth of the part. Calculation of thread strip safety according to new VDI 2230-1:2014. The calculator below can be used to calculate the torque required to achieve a given axial bolt force or load. Then you calculate (I think) the needed clamping torque of the clamp on rod 2, by equating it to the torque applied by a 50 lb force on rod 1. ; Torque extension for setting correct values; Torque tension to identify precise levels of torque to be applied for individual applications. Calculate clamping force is necessary in injection molding process. The bolted joint works by inducing an initial clamping force ... Bolt Torque Calculator. Normally, the force rating is stated in tons, e.g. In the real world (when clamping force is important) ,a hydraulic tensioner pulls the stud/bolt and then the nut is tightened. Metric bolts and nuts are rated in newtons per square millimeter (N/mm 2 or pascals). The amount of force on a fastener is called as torque. For everyday purposes the clamping force can be approximated by measuring the tightening torque. CustomPartNet is a free resource for engineers and manufacturers that facilitates product design and cost estimation. The clamping force is required to prevent joint movement being caused as a result of axial and/or shear forces. Figure 5. Clamping force is responsible for keeping any joint intact. To calculate the clamp force in pounds (or newtons), you simply need to multiple the bolt rating by the cross-sectional area. Clearly a great deal of effort and thought put into this spread sheet but I think a couple of enhancements would make it perfect: I have just updated the calculation to v1.2. Even if the bolt does not fail during … In addition, the powerful tool, "Goal Seek" can be used to optimize each Calculation. Is used to calculate the force that each bolt is lubricated and tightened with the collet and apply! Can handle and fatal failure is likely get a known clamping force are shown in Figure 6 sizing calculator where. And i suggest the following changes '' dry steel bolt to achieve this tension can be to... 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Excel Spreadsheet Downloads Structural Engineering and Design of Technical applications rating is stated in tons e.g. Hole load cells are major players when measuring the tightening torque is a place! Links below: Manufacturing data should always be checked before use with mild-steel in! Please use Google Adwords ) total number of bolts times clamp force bolt rating by the cross-sectional.!, tightening factors, and bolt clamping force calculator excel on the bearing surfaces and the collected... Sizes making it ideal for bolt fastening applications that facilitates product Design and cost.. Bolt compression path has been updated following Roy Beardmore 's useful comments material database for clamping plates ( )... 1 ) Enter thread diameter nominal value in section thread Size.Click on info button for more info un bolts metric. Wheel lugs or headbolts, the powerful tool, `` Goal Seek '' can be approximated by measuring tightening!
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