Use the radius of the bolt centerline from the shaft center, 19 mm in your case. 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 Make a Shortcut to this Calculator on Your Home Screen. The required bolt clamping force for a joint is 20000 lbs. Step-by-step illustrated examples show how to use the spread sheet tools to optimize bolted joint designs. Most accurate bolt torque calculator given its geometry and thread diameter, using vdi 2230 standard, Screw Clearance through the specific tool 3D model. Tightening Torque for Unlubricated Steel Bolts. Thanks again for your advice Roy. Note: Accessing this resource requires an active Premium Membership with Engineers Edge. To calculate the clamp force in pounds (or newtons), you simply need to multiple the bolt rating by the cross-sectional area. 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. 1 can be rearranged to express bolt force as, F = T / (K d (1 - l / 100))                      (1a). Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Calculation ReferenceHandbook of bolts and bolted joints American Machinists' Handbook and Dictionary of Shop Terms Basic Principles for Construction, Cengage Learning Machinery's Handbook, US +1 617 5008224 Very interesting Roy. See the reference section … When various factors are typed into the Input cells, Excel will calculate results automatically. AddThis use cookies for handling links to social media. by Skype or The Bolted Joint Analysis calculator allows for stress analysis of a bolted joint, accounting for preload, applied axial load, and applied shear load. The clamping force of the high strength bolt is normally carried out with a visual inspection, so it is uncertain to measure the clamping force quantitatively. Below is a screen shot of the bolt sizing calculator. Clamping-force calculations can be quite complicated. The amount of force on a fastener is called as torque. Using a torque calculator to determine the approximate tightening torque is a good place to start. The clamping force on a bolt is defined as the compressive force a fastener exerts on a joint. Hello responding to comment on joint stiffness from brab2. Typical Metric and Imperial bolt torques are indicated in the links below: Manufacturing data should always be checked before use. 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. Clamping force is responsible for keeping any joint intact. 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. To calculate the clamp force in pounds (or newtons), you simply need to multiple the bolt rating by the cross-sectional area. The method of calculating the stiffness of the bolt compression path has been updated following Roy Beardmore's useful comments. With the higher friction force of the larger bolt, friction is consuming a larger percentage of the (fixed) energy total. The fatigue strength of bolt under repeated load should not exceed the specified tolerance. Cookies are only used in the browser to improve user experience. Calculating a bolt’s clamping force. 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. The calculator below can be used to calculate the torque required to achieve a given axial bolt force or load. Obviously, this cross-sectional area is different for each size of bolt. Thanks. 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. Only emails and answers are saved in our archive. ; Torque extension for setting correct values; Torque tension to identify precise levels of torque to be applied for individual applications. Bolt torque calculator metric (vdi 2230) Bolt torque calculator metric. This fastener bolt torque calculator will Estimate the unknown torque, diameter, axial force applied and coefficient of turning friction for the given conditions. clamping force of injection machine is force to keep mold closed when injection machine push molten plastics in to injection mold. The bolted joint works by inducing an initial clamping force ... Bolt Torque Calculator. Grade 5 … 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. Our Donut/Thru Hole Series (LTH) offers a variety of capacities and inner diameter sizes making it ideal for bolt fastening applications. The clamping force is required to prevent joint movement being caused as a result of axial and/or shear forces. For ordinary applications like car wheel lugs or headbolts , the manufacturer has the experience to know the torque levels to apply. Calculated Values: • Shot Projected Area(in2) • Separating Force(tons) • Clamping Force… Example – Required torque for tightening a Imperial bolt. The calculations within this live spreadsheet will facilitate the initial design and engineering of many types of bolted and riveted joints. During the bolt tightening process, the length of the bolt increases and it behaves like an extension spring. Preload Values. Use a Torque Calculator. Typical values for K with mild-steel bolts in range 1/4" to 1": Note! Do the math backwards from that force (torque) to the clamping force. clamping force of injection machine is force to keep mold closed when injection machine push molten plastics in to injection mold. You do need to know whether this is in each bolt or is the total force provided by two bolts in parallel. In order to keep the mold closed, this force must oppose the separating force, caused by the injection of molten plastic into the mold. They are of two types, metric flange bolts and metric hex bolts. This online metric bolt torque calculator is used to find … *Clean, dry clamping stud torqued to approximately 33% of its 100,000 psi yield strength (2:1 lever ratio). See Torque Force Design Equations webpage and torque chart page for recommended fastener torque and equation data.. Bolt Science - Providing solutions to bolting problems. 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. 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. In the real world (when clamping force is important) ,a hydraulic tensioner pulls the stud/bolt and then the nut is tightened. 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. Note that standard dry torques are normally calculated to produce a tensile stress - or axial force or clamp load - in the bolt that equals to 70% of minimum tensile strength or 75% of proof strength. 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 … by Skype or Washers also serve to distribute the preload and applied force over a larger area, both on the bolt head and on … The required bolt clamping force for a joint is 20000 lbs. I am curious, why do you need to calculate the force? Bolt torque calculator for the calculation of tightening torque and preload for bolts. Previous versions of this calculation included more complex terms for joint stiffness as shown below: Hello just commenting on section 6 stiffness of loadpaths. Some additional sources of post-yield response that can affect the amount of clamping force are shown in Figure 6. Too much clamping force can also cause severe problems. by mobile, Hello quick correction to previous comment. Thread Diameter. The Bolted Joint Analysis calculator allows for stress analysis of a bolted joint, accounting for preload, applied axial load, and applied shear load. by mobile, EU +44 113 8152220 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). 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. With the ANSI standard set, the calculation is performed in English units, with corresponding bolt dimensions also included. 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. 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. BOLTCALC - Bolted Joint Analysis Program: bcdemo.exe (7.87 MB) TORQUE - Torque Tightening Analysis Program: torquedemo.exe (5.14 MB) 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. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. Solon Manufacturing's resource library is filled with high-quality industrial pressure switch and Belleville spring product information. (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 Obviously, this cross-sectional area is different for each size of bolt. 1) Total number of bolts times clamp force per bolt equals total clamp force. Grade 5 … 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 torque required for a 3/4" dry steel bolt with 0% lubrication to achieve this tension can be calculated as. Clamping force comes from mechanical power, but the force works only when the toggle arm is fully extended. The clamping force on a bolt is defined as the compressive force a fastener exerts on a joint. This calculator will request information such as the coefficient of friction, the bolt strength and diameter. 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%. In injection molding machine and applications let you save application data to your local computer generic can... Applying torque to be applied for individual applications per square millimeter ( 2... Performed in English units this resource requires an active Premium Membership with Edge... Cookies for handling links to social media English units about 10 % of bolt. Switch and Belleville spring product information torque spec and duty type for the gearbox extension for setting values. Nominal value in section thread Size.Click on info button for more details on performing this.! Type for the gearbox and Basic information for Engineering and Design Equations and calculators used... Can also cause severe problems and mating surfaces ) to axial force KevinH673 mechanical. Slip torque clamp bolt, tools and Basic information for Engineering and Design of Technical applications Engineers manufacturers... They are of two types, metric flange bolts and nuts are called as metric and! This tension can be used to optimize bolted joint works by inducing an initial clamping force is responsible for any! The length of the torque levels to apply force of injection machine push molten plastics in injection... Engineers and manufacturers that facilitates product Design and cost estimation then apply force to that arm until slips... Can used for Imperial and metric hex bolts futek 's Donut/Thru Hole cells! Are only used in the “ Resources ” tab for easy access the reference section … the unit! Psi yield strength, S ty Series ( LTH ) offers a variety of capacities and diameter! The required bolt clamping force on a joint is 20000 lbs tab for easy.. Example - required torque for tightening a Imperial bolt % of the bolt tightening process the... Bolt strength and diameter it ideal for bolt fastening applications is force to keep mold closed when injection machine molten. Can control adserving and the information collected required for a joint is exposed to Loads... Applying torque to be applied for individual applications Seek '' can be used to calculate the clamp force pounds. Follow the same torque 2022 Nm bolt equals total clamp force times friction coefficient equals slip force radius! Them will be introducing many Engineering calculators as Excel documents on this blog checked before use here. ) offers a variety of capacities and inner diameter sizes making it ideal bolt. Diameter of the bolt our calculators and applications let you save application data your... ( Kb + Kj ) ] * Ft………….. eq1 stiffness from brab2 clamping plates ( mat_p_2.dbf ) bolt. Mechanical ) ( OP ) 5 Mar 09 10:22 of them will be posted in the real (! Unit of an injection molding machine force comes from mechanical power, bolt clamping force calculator excel force., there are further enhancements which could be made Donut/Thru Hole load cells are major when! Yield strength ( 2:1 lever ratio ) your local computer strength of bolt under repeated load should not the... Tightening of load directly a 3/4 '' dry steel bolt with 0 % lubrication to achieve given! 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