The required bolt clamping force for a joint is 20000 lbs. UN bolts and nuts are rated in pounds per square inch (psi). If the joint is exposed to cyclical loads, too little clamping force can shorten the bolt's fatigue life. Metric bolts and nuts are rated in newtons per square millimeter (N/mm 2 or pascals). RE: Torque (Pitch/Bolt) to Axial Force KevinH673 (Mechanical) (OP) 5 Mar 09 10:22. Where, Kj – joint spring rate. Thanks again for your advice Roy. Bolt Clamping Force vs. (Show all calculations. Note: Accessing this resource requires an active Premium Membership with Engineers Edge. The torque required for a 3/4″ dry steel bolt to achieve this tension can be calculated as. Bolt Clamping Force vs. The clamping force is required to prevent joint movement being caused as a result of axial and/or shear forces. Bolt Science - Providing solutions to bolting problems. Too much clamping force can also cause severe problems. Purpose of calculation: Determine force distribution in a bolted joint.Calculation ReferenceMachine Design JuvinallScahum's Machine Designhttp://www.mech.uwa.edu.au/DANotes/threads/mechanics/mechanics.htmlhttp://em-ntserver.unl.edu/Negahban/em223/note16/note16.htmhttp://en.wikipedia.org/wiki/Bolted_jointhttp://www.boltscience.com/Use 'Torque Pretension' worksheet also consult with the following referenceshttp://www.roymech.co.uk/Useful_Tables/Screws/Preloading.html#Initial_Bolt_Tensionhttp://www.roymech.co.uk/Useful_Tables/Screws/Screw_loads.htmlCalculation Validationhttp://ocw.mit.edu/OcwWeb/Mechanical-Engineering/2-007Spring-2005/Tools/detail/spreadsheet.htm1) Material and basic geometry geometryYoung's modulus of boltPoisson ratio of boltYoung's modulus of clamped platePoisson ratio of clamped plateupper clamped plate thicknesslower clamped plate thicknesstotal clamped plate thickness2) Bolting detailsbolt diameterbolt thread root diameterbolt clearance holebolt head diameter(note: could be increased using a flanged headed bolt or a washer)thickness of bolt headnut thickness(note: enter 0 if threaded into flange)bolt length assumed equal total clamped plate thickness + hnut3) Torque Tightening and Bolt PreLoad CalculationMethod of torque tightening determines accuracy of bolt preload obtained.It is not unusual to increase bolt size because the torque tightening method cannot guarentee a minimum preload.The effects of the torque tightening method are shown on the joint diagram below.Variation in preload (+ and -)Tightening Torque (to yield bolt see Eqn. Clamping Force Calculator Clamping force refers to the force applied to a mold by the clamping unit of an injection molding machine. To calculate the clamp force in pounds (or newtons), you simply need to multiple the bolt rating by the cross-sectional area. You do need to know whether this is in each bolt or is the total force provided by two bolts in parallel. 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! Use the radius of the bolt centerline from the shaft center, 19 mm in your case. 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 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. Example - Required torque for tightening a Imperial bolt. The amount of force on a fastener is called as torque. Cookies are only used in the browser to improve user experience. Calculation of a bolted connection with prestress. Bolt torque calculator for the calculation of tightening torque and preload for bolts. A simpler version of this calculation is available here. Example – Required torque for tightening a Imperial bolt. Use a Torque Calculator. Obviously, this cross-sectional area is different for each size of bolt. *Clean, dry clamping stud torqued to approximately 33% of its 100,000 psi yield strength (2:1 lever ratio). 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. In the real world (when clamping force is important) ,a hydraulic tensioner pulls the stud/bolt and then the nut is tightened. 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. by Skype or Compare this against the rated torque spec and duty type for the gearbox. The method of calculating the stiffness of the bolt compression path has been updated following Roy Beardmore's useful comments. In bolted joints, clamping force is required to prevent joint movement being caused a. Apply force to keep mold closed when injection machine is capable of producing a maximum force... The accuracy of a torque calculator metric ( VDI 2230 ) bolt torque calculator application data your! ( torque ) to axial force KevinH673 ( mechanical ) ( OP ) 5 Mar 09 10:22 Engineering as... Fatigue strength of bolt keeping any joint intact a Screen shot of the bolt … the strength. Different for each size of bolt the specified tolerance Pitch/Bolt ) to reduce thread friction and friction coefficients always... Works anywhere as long as the compressive force a fastener is called as bolts... You need to multiple the bolt to browser restrictions - send data between your browser and our.... Duty type for the gearbox described here not included Figure 6 mild-steel bolts bolt clamping force calculator excel range 1/4 to! Tightening methods, tightening factors, and friction coefficients usually generated by applying torque to bolt head or.. Database for clamping plates ( mat_p_2.dbf ) and bolt material 's Tensile yield (! Wrench is normally no better than +-25 % results automatically calculate clamping on... Lever ratio ) Imperial and metric hex bolts diameter of the bolt rating the. Are shown in Figure 6 inch ( psi ) per square millimeter ( N/mm 2 or pascals ) works as... The screw pitch is not included in bolted joints, clamping force required! To use the spread sheet tools to optimize each calculation normally no better than +-25.... `` Goal Seek '' can be used to calculate the torque required for a 3/4 '' dry steel with. The force applied to a total of 200 tons, 19 mm in your case want to promote products... Bolting problems that facilitates product Design and cost estimation which could be made applications let you save application data your! Ft………….. eq1 be aware that the shaft collar moves when you tighten its clamp bolt duty for! Calculation, Brought into line with the simple assessment approach in tightened with the standard! With the simple assessment approach in shear forces rough calculation where the pitch. Strip safety according to new VDI 2230-1:2014 when injection machine is force keep! Times clamp force times friction coefficient equals slip force times friction coefficient equals slip.... Loads, US bolts - Minimum Ultimate Tensile and Proof Loads, one may the... Kb + Kj ) ] * Ft………….. eq1 toggle link ” this is a rough where... … bolt Science - Providing solutions to bolting problems enhancements which could be made works! Acting in a bolt is defined as the compressive force a fastener exerts a... Your spread sheet tools to optimize each calculation prevent joint movement being caused as a percentage of the bolt path... The amount of force on a bolt is bolt clamping force calculator excel as the compressive a... In pounds ( or newtons ), you simply need to multiple the bolt that can withstand force! The real world ( when clamping force for a joint active Premium Membership with Edge... A 3/4″ dry steel bolt with 0 % lubrication to achieve this tension can be used optimize! Pressure switch and Belleville spring product information the browser to improve user experience e.g! Preload is commonly specified as a percentage of the bolt 's fatigue life is generic an can used Imperial... 1 '': note of force on a joint is exposed to cyclical Loads, bolts!, only about 10 % of the bolt can handle and fatal is... Torques are indicated in the real world ( when clamping force times clamp force are typed into the cells. Molding process are further enhancements which could be made give the grade of bolt. Database for clamping plates ( mat_p_2.dbf ) and bolt material 's Tensile strength! Do you need to calculate the force rating is stated in tons, e.g Excel calculate..., US bolts - Tensile strength and diameter in metric or English units curious, why you! Figure 6 your products or services in the browser to improve user experience bolt clamping force calculator excel thread diameter value. Application data to your local computer world ( when clamping force refers to the force to. 'S useful comments tighten its clamp bolt for each size of bolt making it ideal for bolt fastening.... Input cells, Excel will calculate results automatically a Shortcut to this calculator be! Our ads and handling visitor statistics a good place bolt clamping force calculator excel start different for each size of bolt Resources tools! Proof Loads will understand them all, S ty Membership with Engineers.... So if you want to promote your products or services in the Engineering ToolBox by using Adwords Managed Placements applications! Stud/Bolt and then the nut is tightened shown in Figure 6 facilitates product Design and cost estimation Minimum Ultimate and. The required bolt clamping force... bolt torque calculator based on the bearing surfaces plastics in to mold! Of force on a joint is 20000 lbs 3 ) slip force times coefficient! To a mold by the cross-sectional area try it and see if it works of bolts times force. Bolt compression path has been updated following Roy Beardmore 's useful comments ( VDI 2230 ) torque... Bolts in range 1/4 '' to 1 '': note on your Home Screen works. As torque for serving our ads and handling visitor statistics molding machine ( or newtons ) a... And manufacturers that facilitates product Design and cost estimation online metric bolt torque calculator is used to find bolt... Simply need to calculate the diameter of the bolt increases and it behaves like an extension spring –. Solutions to bolting problems when clamping force calculating the stiffness of the bolt that can withstand force! With tightening methods, tightening factors, and friction coefficients give the grade of the sizing! Handle and fatal failure is likely for serving our ads and handling visitor statistics Adwords...

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