With the smaller bolt, a larger percentage of the input energy is being converted to strain energy in the bolt/screw, which means more clamping force. T dry = (0.2) (20000 lb) (0.75 in) = 3000 (in lb) = 3000 (in lb) / 12 (in/ft) = 250 (ft lb) 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. Obviously, this cross-sectional area is different for each size of bolt. Obviously, this cross-sectional area is different for each size of bolt. With the ANSI standard set, the calculation is performed in English units, with corresponding bolt dimensions also included. They are of two types, metric flange bolts and metric hex bolts. 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. For ordinary applications like car wheel lugs or headbolts , the manufacturer has the experience to know the torque levels to apply. 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. Tightening Torque for Unlubricated Steel Bolts. 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. Bolt Fastening. Figure 5. The reduced torque can be calculated, Eq. Metric Bolt Torque Calculator. Bolts that are fully or partially threaded, with washers and nuts are called as metric bolts. The calculator below can be used to calculate the torque required to achieve a given axial bolt force or load. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! See the instructions within the documentation for more details on performing this analysis. Learn about the process cycle and design for manufacturing (DFM) guidelines for a wide range of manufacturing processes, including injection molding, metal casting, machining (milling and turning), and rapid prototyping. Bolt Science - Providing solutions to bolting problems. When various factors are typed into the Input cells, Excel will calculate results automatically. With the higher friction force of the larger bolt, friction is consuming a larger percentage of the (fixed) energy total. During the bolt tightening process, the length of the bolt increases and it behaves like an extension spring. I would just try it and see if it works. In the real world (when clamping force is important) ,a hydraulic tensioner pulls the stud/bolt and then the nut is tightened. ... (controlled clamping of the joint). Example - Required torque for tightening a Imperial bolt. Metric bolts and nuts are rated in newtons per square millimeter (N/mm 2 or pascals). ; Torque extension for setting correct values; Torque tension to identify precise levels of torque to be applied for individual applications. This is. Calculate the diameter of the bolt that can withstand the force that each bolt is subjected to, using the equation P=S/A. Looking further into your spread sheet, there are further enhancements which could be made. Bolt torque calculator metric (vdi 2230) Bolt torque calculator metric. The resultant force of the preload (Fp) and applied tensile load (Ft) is the clamping force (Fc) for the joint in tension. By over-tightening the bolt, one may exceed the proof load of the bolt. 2) In section Head Size and Type either select one fastener ISO with the "Select Standard for Type" option or enter manually the type and whether the fastener is socket or not in the right part of the page, once you have selected Custom option.. 3) Enter strength class of the fastener. Check out our bolt torque calculator based on the methodology described here. 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. Sometimes an approximate method is good enough. Where Does the Fastening Energy Go? Metric Bolts - Minimum Ultimate Tensile and Proof Loads, US Bolts - Tensile Strength and Proof Loads. Compare this against the rated torque spec and duty type for the gearbox. The fatigue strength of bolt under repeated load should not exceed the specified tolerance. We don't collect information from our users. Typical values for K with mild-steel bolts in range 1/4" to 1": Note! 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. by mobile, EU +44 113 8152220 The clamping force on a bolt is defined as the compressive force a fastener exerts on a joint. Our Donut/Thru Hole Series (LTH) offers a variety of capacities and inner diameter sizes making it ideal for bolt fastening applications. 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. Calculate the Needed Clamping Force using the equation in posting: (https: ... You do need to know whether this is in each bolt or is the total force provided by two bolts in parallel. T dry = (0.2) (20000 lb) (0.75 in) (1/12 ft/in) (1 - (0%) / (100%)) = 250 (lb f ft) You could make a test piece with a lever arm. Cookies are only used in the browser to improve user experience. Washers also serve to distribute the preload and applied force over a larger area, both on the bolt head and on … See the reference section … 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. Pipe Stress Clamping Force . This calculator can be used to calculate the force acting in a bolt. © 2007-2020 MoreVision Ltd. All Rights Reserved. I do agree and I suggest the following changes. In the real world (when clamping force is important) ,a hydraulic tensioner pulls the stud/bolt and then the nut is tightened. Updated material database for clamping plates (mat_p_2.dbf) and bolt material. + Toggle System: It is “toggle link”. The hand calculations were not my own. FUTEK's Donut/Thru Hole Load Cells are major players when measuring the tightening of load directly. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. - be aware that this is a rough calculation where the screw pitch is not included. 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. by mobile, Hello quick correction to previous comment. 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. 2) Total clamp force times friction coefficient equals slip force. 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 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. Note: Accessing this resource requires an active Premium Membership with Engineers Edge. 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. Thread Diameter. The fatigue strength of bolt under repeated load should not exceed the specified tolerance. Do the math backwards from that force (torque) to the clamping force. In addition the accuracy of a torque wrench is normally no better than +-25%. The contact force allows the joint to sustain a shear load (Fs) by friction. Pipe Stress due to Clamping Force Spreadsheet Calculator. In order to keep the mold closed, this force must oppose the separating force, caused by the injection of molten plastic into the mold. Instructions Formula Send us your comment. Clamping force is responsible for keeping any joint intact. A simpler version of this calculation is available here. Bolts that are fully or partially threaded, with washers and nuts are called as metric bolts. UN bolts and nuts are rated in pounds per square inch (psi). Use the radius of the bolt centerline from the shaft center, 19 mm in your case. The torque required for a 3/4" dry steel bolt with 0% lubrication to achieve this tension can be calculated as. CustomPartNet is a free resource for engineers and manufacturers that facilitates product design and cost estimation. We don't save this data. Bolt torque calculator for the calculation of tightening torque and preload for bolts. These applications will - due to browser restrictions - send data between your browser and our server. 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. The proof load for a M30 metric bolt grad 8.8 is 337000 N. The torque required to achieve this force with a dry bolt is calculated to 2022 Nm. You can target the Engineering ToolBox by using AdWords Managed Placements. I follow the same simple format on all my documents, so if you understand one you will understand them all. Using a torque calculator to determine the approximate tightening torque is a good place to start. This calculator will request information such as the coefficient of friction, the bolt strength and diameter. See the instructions within the documentation for more details on performing this analysis. The Bolted Joint Analysis calculator allows for stress analysis of a bolted joint, accounting for preload, applied axial load, and applied shear load. 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. Calculation of a bolted connection with prestress. Fc=Fp – [Kj / (Kb + Kj)]* Ft…………..eq1. Metric bolts and nuts are rated in newtons per square millimeter (N/mm 2 or pascals). To calculate the clamp force in pounds (or newtons), you simply need to multiple the bolt rating by the cross-sectional area. In addition, the powerful tool, "Goal Seek" can be used to optimize each Calculation. Updated databases with tightening methods, tightening factors, and friction coefficients. 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. 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. Bolt Science - Information related to bolted joints. Welcome to our technical resource library! Typical Metric and Imperial bolt torques are indicated in the links below: Manufacturing data should always be checked before use. You do need to know whether this is in each bolt or is the total force provided by two bolts in parallel. Grade 5 … The clamping force on a bolt is defined as the compressive force a fastener exerts on a joint. Most accurate bolt torque calculator given its geometry and thread diameter, using vdi 2230 standard, Screw Clearance through the specific tool 3D model. The required bolt clamping force for a joint is 20000 lbs. Sometimes an approximate method is good enough. This is way above what the bolt can handle and fatal failure is likely. Clamping Force Calculator Clamping force refers to the force applied to a mold by the clamping unit of an injection molding machine. Calculation of thread strip safety according to new VDI 2230-1:2014. By failure the bolt is lubricated and tightened with the same torque 2022 Nm. In order to keep the mold closed, this force must oppose the separating force, caused by the injection of molten plastic into the mold. The Bolted Joint Analysis calculator allows for stress analysis of a bolted joint, accounting for preload, applied axial load, and applied shear load. Some of our calculators and applications let you save application data to your local computer. The calculator is generic an can used for imperial and metric units as long as the use of units are consistent. 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). For everyday purposes the clamping force can be approximated by measuring the tightening torque. 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. The amount of force on a fastener is called as torque. The bolted joint works by inducing an initial clamping force ... Bolt Torque Calculator. Example – Required torque for tightening a Imperial bolt. 1 can be rearranged to express bolt force as, F = T / (K d (1 - l / 100))                      (1a). Compare this against the rated torque spec and duty type for the gearbox. See Torque Force Design Equations webpage and torque chart page for recommended fastener torque and equation data.. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. For ordinary applications like car wheel lugs or headbolts , the manufacturer has the experience to know the torque levels to apply. Some additional sources of post-yield response that can affect the amount of clamping force are shown in Figure 6. 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 The amount of force on a fastener is called as torque. The relation between applied torque and axial force - or load - in a bolt can be calculated in this general equation as, T = K F d  (1 - l/100)                    (1), K = constant that depends on the bolt material and size. Clamping-force calculations can be quite complicated. Step-by-step illustrated examples show how to use the spread sheet tools to optimize bolted joint designs. Here you will find pages, links, and information that will assist with your product selection and also answer questions you might have about our American Belleville springs and washers and industrial pressure switches. Clamping Force Calculator is a tool to calculate the Clamping Force in the injection molding machine based on the different area’s like part projected area, runner projected area, cavity pressure and number of cavities. Contact us today. Calculating a bolt’s clamping force. This fastener bolt torque calculator will Estimate the unknown torque, diameter, axial force applied and coefficient of turning friction for the given conditions. UN bolts and nuts are rated in pounds per square inch (psi). This post will explain about clamping device, calculation of the clamping force, projected area and injection pressure,… The clamping force is required to prevent joint movement being caused as a result of axial and/or shear forces. Below is a screen shot of the bolt sizing calculator. The calculations within this live spreadsheet will facilitate the initial design and engineering of many types of bolted and riveted joints. Very interesting Roy. 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. Where, Kj – joint spring rate. Google use cookies for serving our ads and handling visitor statistics. Use a Torque Calculator. by Skype or Grab it with the collet and then apply force to that arm until it slips. 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. 3) Slip force times radius = slip torque. Bolt Clamping Force vs. Preload Values. In order to keep the mold closed, this force must oppose the separating force, caused by the injection of molten plastic into the mold. Figure 6. Thanks. I am curious, why do you need to calculate the force? The calculation is carried out in metric or English units. by Skype or 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. 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 1) Total number of bolts times clamp force per bolt equals total clamp force. a 200 ton machine is capable of producing a maximum clamping force equivalent to a total of 200 tons. 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. Exerts on a joint is exposed to cyclical Loads, too little force... 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Bolt … the fatigue strength of bolt LTH ) offers a variety of and! Each calculation ads and handling visitor statistics US bolt clamping force calculator excel - Tensile strength and Proof.... For individual applications info button for more info Manufacturing data should always be checked before use *..... Promote your products or services in the links below: Manufacturing data should always be checked before.. As a percentage of the bolt material 's Tensile yield strength, S ty ) OP... Simply need to multiple the bolt material our ads and handling visitor statistics example – required torque tightening. Of clamping force for a joint answers are saved in our archive arm is fully extended yield... The torque levels to apply services in the links below: Manufacturing data should always be before... Mechanical power, but the force applied to a total of 200 tons need to multiple the bolt by... Understand one you will understand them all high-quality industrial pressure switch and Belleville spring product information arm. Browser to improve user experience Series ( LTH ) offers a variety capacities.