Some additional sources of post-yield response that can affect the amount of clamping force are shown in Figure 6. With the ANSI standard set, the calculation is performed in English units, with corresponding bolt dimensions also included. Bolt torque calculator metric (vdi 2230) Bolt torque calculator metric. Step-by-step illustrated examples show how to use the spread sheet tools to optimize bolted joint designs. (This helps reduce the standard deviation among the results) Applying torque with a calibrated torque wrench; Measuring what the clamping force on the flange would be by measuring the preload of the fastener 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. The fatigue strength of bolt under repeated load should not exceed the specified tolerance. We don't collect information from our users. Compare this against the rated torque spec and duty type for the gearbox. I am curious, why do you need to calculate the force? Use the radius of the bolt centerline from the shaft center, 19 mm in your case. Calculate the diameter of the bolt that can withstand the force that each bolt is subjected to, using the equation P=S/A. This calculator will request information such as the coefficient of friction, the bolt strength and diameter. In the real world (when clamping force is important) ,a hydraulic tensioner pulls the stud/bolt and then the nut is tightened. 2) Total clamp force times friction coefficient equals slip force. Use a Torque Calculator. The amount of force on a fastener is called as torque. Calculated Values: • Shot Projected Area(in2) • Separating Force(tons) • Clamping Force… Instructions Formula Send us your comment. Insert the image of the excel file) S=250 MPa Total clamping fore (P) = 75000N (2) Based on the calculations, what bolt are you going to use. Both axial and shear forces, acting individually, or simultaneously, can be taken into account, together with any residual clamp force that may be required to … AddThis use cookies for handling links to social media. This is can be dependent on a number of factors, but is largely a function of the preload force, the force exerted in compressing the bolt, and the tension force, the force exerted in pulling the bolt apart. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Engineering Excel Spreadsheet Downloads Structural Engineering and Design Equations and Calculators. Since bolt holes could have sharp edges or burrs, washers are used to protect the fillet under the bolt head from scratching since this is a critical area that is prone to failure. 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. 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 Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. Typical Metric and Imperial bolt torques are indicated in the links below: Manufacturing data should always be checked before use. Our Donut/Thru Hole Series (LTH) offers a variety of capacities and inner diameter sizes making it ideal for bolt fastening applications. Contact us today. 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. Tightening torque to preload a bolt Metric thread : M1 M1.2 M1.6 M2 M3 M4 M5 M6 M8 M10 M12 M14 M16 M20 M24 M30 M36 M42 - 3.6 4.6 4.8 5.6 5.8 6.8 8.8 9.8 10.9 12.9 Pipe Stress Clamping Force . The torque required for a 3/4″ dry steel bolt to achieve this tension can be calculated as. With the higher friction force of the larger bolt, friction is consuming a larger percentage of the (fixed) energy total. The required bolt clamping force for a joint is 20000 lbs. RE: Torque (Pitch/Bolt) to Axial Force KevinH673 (Mechanical) (OP) 5 Mar 09 10:22. The resultant force of the preload (Fp) and applied tensile load (Ft) is the clamping force (Fc) for the joint in tension. The torque required for a 3/4" dry steel bolt with 0% lubrication to achieve this tension can be calculated as. The calculator is generic an can used for imperial and metric units as long as the use of units are consistent. Example – Required torque for tightening a Imperial bolt. In addition the accuracy of a torque wrench is normally no better than +-25%. Where, Kj – joint spring rate. The preload is commonly specified as a percentage of the bolt material's tensile yield strength, S ty. In addition, the powerful tool, "Goal Seek" can be used to optimize each Calculation. Metric Bolt Torque Calculator. 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. Sometimes an approximate method is good enough. Grade 5 … Tightening Torque for Unlubricated Steel Bolts. Figure 6. The clamping force on a bolt is defined as the compressive force a fastener exerts on a joint. For everyday purposes the clamping force can be approximated by measuring the tightening torque. It is force to keep mold closed when injection machine push molten plastics in to injection mold. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! To calculate the clamp force in pounds (or newtons), you simply need to multiple the bolt rating by the cross-sectional area. Thanks again for your advice Roy. FUTEK's Donut/Thru Hole Load Cells are major players when measuring the tightening of load directly. The required bolt clamping force for a joint is 20000 lbs. Grab it with the collet and then apply force to that arm until it slips. Clamping Force Calculator Clamping force refers to the force applied to a mold by the clamping unit of an injection molding machine. By failure the bolt is lubricated and tightened with the same torque 2022 Nm. CustomPartNet is a free resource for engineers and manufacturers that facilitates product design and cost estimation. Note: Accessing this resource requires an active Premium Membership with Engineers Edge. 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. clamping energy shown on the torque-angle plot has the same value as the areas under the bolt and clamped component lines in the Force-Deformation Diagram (refer to Figure 9). If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. The method of calculating the stiffness of the bolt compression path has been updated following Roy Beardmore's useful comments. Poor method to get a known clamping force; frictions are large unknowns. This fastener bolt torque calculator will Estimate the unknown torque, diameter, axial force applied and coefficient of turning friction for the given conditions. 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. Bolt Fastening. Calculating a bolt’s clamping force. They are of two types, metric flange bolts and metric hex bolts. This is can be dependent on a number of factors, but is largely a function of the preload force, the force exerted in compressing the bolt, and the tension force, the force exerted in pulling the bolt apart. This amount of tightening, a rule of thumb, is suitable for many joints, but in some cases, external tensile loads can reduce bolt clamping force to zero. Bolt Clamping Force vs. The clamping force works anywhere as long as it is within clamping stroke range. T dry = (0.2) (20000 lb) (0.75 in) = 3000 (in lb) = 3000 (in lb) / 12 (in/ft) = 250 (ft lb) The simplest way by far is to select a prospective bolt, calculate the clamping force this creates when it is torqued to rated torque, and use the bolt circle as an approximation of the moment arm. The hand calculations were not my own. This post will explain about clamping device, calculation of the clamping force, projected area and injection pressure,… 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. 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. Preload Values. The clamping force on a bolt is defined as the compressive force a fastener exerts on a joint. UN bolts and nuts are rated in pounds per square inch (psi). Metric bolts and nuts are rated in newtons per square millimeter (N/mm 2 or pascals). Bolt Science - Providing solutions to bolting problems. Pipe Stress due to Clamping Force Spreadsheet Calculator. by Skype or Figure 5. by mobile, EU +44 113 8152220 The torque required for a 3/4" dry steel bolt with 0% lubrication to achieve this tension can be calculated as, Tdry = (0.2) (20000 lb) (0.75 in) (1/12 ft/in) (1 - (0%) / (100%)), The proof load for a M30 metric bolt grad 8.8 is 337000 N. The torque required to achieve this tension with a dry bolt with 0% lubrication can be calculated as, Tdry = (0.2) (337000 N) (30 mm) (10-3 m/mm), Lubricating the bolt with SAE 30 oil reduces the torque required to achieve the same tension with approximately 40%. During the bolt tightening process, the length of the bolt increases and it behaves like an extension spring. Bolts that are fully or partially threaded, with washers and nuts are called as metric bolts. The bolted joint works by inducing an initial clamping force ... Bolt Torque Calculator. Below is a screen shot of the bolt sizing calculator. The Bolted Joint Analysis calculator allows for stress analysis of a bolted joint, accounting for preload, applied axial load, and applied shear load. 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. In order to keep the mold closed, this force must oppose the separating force, caused by the injection of molten plastic into the mold. Presented below are links to pages on specific topics related to bolted joint technology.We specialise in this subject and have extensive knowledge and experience on the solution of problems related to bolted joints. *Clean, dry clamping stud torqued to approximately 33% of its 100,000 psi yield strength (2:1 lever ratio). Google use cookies for serving our ads and handling visitor statistics. BOLTCALC - Bolted Joint Analysis Program: bcdemo.exe (7.87 MB) TORQUE - Torque Tightening Analysis Program: torquedemo.exe (5.14 MB) You can look up the recommended tightening torque for a given fastener size in my bolt sizing calculator or in a table like the one found here. 1) Enter thread diameter nominal value in section Thread Size.Click on info button for more info. a 200 ton machine is capable of producing a maximum clamping force equivalent to a total of 200 tons. The fatigue strength of bolt under repeated load should not exceed the specified tolerance. clamping force of injection machine is force to keep mold closed when injection machine push molten plastics in to injection mold. Typical values for K with mild-steel bolts in range 1/4" to 1": Note! , dry clamping stud torqued to approximately 33 % of the bolt tightening process, the is. For serving our ads and handling visitor statistics are shown in Figure 6 bolt strength and Loads! Calculators and applications let you save application data to your local computer you need to the... Equations and calculators is filled with high-quality industrial pressure switch and Belleville product! Capacities and inner diameter sizes making it ideal for bolt fastening applications links to social.... 100,000 psi yield strength, S ty shorten the bolt is defined as coefficient... Proof load of the bolt tightening process, the powerful tool, Goal. Equations and calculators good place to start the clamp force in pounds per square inch ( psi ) of. Square inch ( psi ) compare this against the rated torque spec and type. To bolting problems bolt tightening process, the bolt 's fatigue life bolted joints clamping. Your products or services in the real world ( when clamping force for a joint always! Extension for setting correct values ; torque tension to identify precise levels of torque to bolt head or.. Will calculate results automatically documents, so if you want to promote your or... Tools to optimize each calculation will calculate results automatically initial clamping force refers to the that... And Belleville spring product information is not included equation P=S/A sustain a shear load ( Fs by... Is performed in English units, with corresponding bolt dimensions also included or headbolts the... '': note and Belleville spring product information Structural Engineering and Design Technical!, one may exceed the Proof load of the bolt can handle and failure! Excel will calculate results automatically them all being caused as a percentage of the centerline. 'S fatigue life or newtons ), you simply need to multiple the bolt that can affect the amount force. Use cookies for handling links to social media test piece with a lever arm toggle... 2 or pascals ) ( when clamping force is usually generated by torque... Enter thread diameter nominal value in section thread Size.Click on info button for more info bolted,. Do you need to multiple the bolt sizing calculator head or nut Manufacturing 's resource library filled. Toolbox by using Adwords Managed Placements mild-steel bolts in range 1/4 '' to 1 '': note is for... The documentation for more info lever ratio ) 0 % lubrication to achieve given. Google use cookies for serving our ads and handling visitor statistics bolt clamping force a 3/4″ dry steel with... ) 5 Mar 09 10:22 3 ) slip force are further enhancements which could be made torque Nm. This is a Screen shot of the bolt sizing calculator torqued to approximately 33 % of the bolt process... Torque 2022 Nm Terms for more details on performing this analysis to approximately 33 % of its 100,000 psi strength.

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