# Bolt Clamping Force Calculation Pdf

Even if the bolt does not fail during assembly, it may later break under the external. The thermal loadings were of both spatially-uniform and spatially-nonuniform temperatures on the assemblies. is suitable for many joints, but in some cases, external tensile loads can reduce bolt clamping force to zero. For choosing optimal clamp dimensions (thicknesses, widths, bolts number, diameters, etc. 9(a) that the deformation occurs on the clamp, not on the piping systems, and the interference fits is relaxed. Proof load, Fp [ in tables 8-9,10,11 and is the tensile area table 8-1,2] Preload,. Bolts generate a lot of clamp load in a small area. Automation of clamping force calculation in fixture design Article in Turkish Journal of Engineering and Environmental Sciences 25(1):19-30 · January 2001 with 1,088 Reads How we measure 'reads'. ASTM's fastener standards are instrumental in specifying, testing, and evaluating the material, dimensional, mechanical, and metallurgical properties of the various forms of hardware fasteners. 5 times the bolt diameter for full strength connection (assumes nut and bolt are the same material). In a flange assembly, the gasket is placed between two flanges, which are then clamped together with bolts, studs, or other clamping devices. • Pre-stressing the clamp to its rated force prior to actual. Shear stress is the force, F, acting on a given section divided by the cross sectional area, A, of the section, calculated in the direction of the force. 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. The clamping force is released by pressurising the. unusual for the bolt to be overloaded. With this system, you can easily record and plot torque, angle, or clamp force versus time, torque and clamp force versus angle, tool rpm, and many other useful plots. Connection and Tension Member Design Notation: A = area (net = with holes, bearing = in contact, etc) A e = effective net area found from the product of the net area A n by the shear lag factor U A b = area of a bolt A g = gross area, equal to the total area ignoring any holes A gv = gross area subjected to shear for block shear rupture A n. of a force is the perpendicular distance. The results showed that the piping system saw both load increases and load decreases at various locations in the piping run. Forces on an object are usually balanced (if unbalanced the object accelerates): The cables pull downwards equally to the left and right, and that is balanced by the tower's upwards push. Torque Calculation. • Threaded rod, not bolt, inserted is through the plates –secured with nut • Clamping force applied using a hydraulic cylinder 49 ± 0. Turn back specified amount of rope from thimble or loop. Complete the mounting by assembling a cover plate and using the hex head bolts to tighten the upper clamp assembly. supported by only three of the six bolts originally envisioned in the design. • Using block and plane analogy with impending motion up the plane, calculate the clamping force with a force triangle. Techlok clamp connectors do not rely on the conventional flange gaskets and correctly tensioned bolts to maintain the integrity of the seal. If map is too big, and it's often the case, then it will downsize it until there are sufficiently few fighters so that the CPU can handle the job. The load distribution on the bolts is calculated on the assumption that rigid plates are connected by springs at the bolt positions. Draw a graph (plotting force versus time) showing three or four external load fluctuations, and corresponding curves showing the fluctuations in total bolt load and total joint clamping force. Bolt Torque. Bolt Tensioners: Torsion-free generation of tension force. 3 CALCULATION OF THE MAXIMUM AND MINIMUM PRELOADS The bolt strength criteria, the bolt fatigue and fracture criteria, and the joint separation criteria do not require that the preload be multiplied by yield, ultimate or joint separation factors of safety, yet any uncertainty in the preload must be taken into account. Push the gland toward the socket and center it around the pipe with the gland against the gasket. ) Suggested Tightening Torque1 Values To Produce Corresponding Bolt Clamping Loads Notes: 1. FEA to perform a finite element analysis of a 2” 3 segment clamp in order to gain an insight into its clamping efficiency. Clamping force Bolt Vc Max. Shear Strength is defined as the maximum load typically applied normal to a fastener’s axis that can be supported prior to fracture. SPIROL strongly recommends not to exceed 75% of proof load. The results reveal the efficiency of the head gasket sealing depends on the pre-stressing force of the. the tension in the stem bolt required to firmly hold the work piece is 22 720 N 2. The determinant factor that affects the clamping force is the ambient temperature, as indicated by the Korean standard B 2819. The following details the steps necessary to compute the stresses using FEA in SolidWorks. How to Solve Uneven Clamping Of the hundreds of variables involved in injection molding, clamping mechanisms and platens often get less attention than they deserve. This online metric bolt torque calculator is used to find the torque of the ecoguard, lubricated and dry metric bolts. The reasons for this lie in the dispersion range of torque values and the overall coefficient of friction, i. ECOTECH –. 4375 / 4 = 0. Achieving. A bolt functions similar to a spring, in that it needs to be stretched beyond it’s static length in order to apply a clamping force. hose clip/clamp or Jubilee clip) consists of a ﬂexible band of metal wrapped around a cylindricalobject(e. Additionally, the bolts and flanges must be robust enough to prevent warpage, distortion or separa-tion during service. The reasons for this lie in the dispersion range of torque values and the overall coefficient of friction, i. In fact, the bolt diameter is a little smaller and the nut diameter a little larger. CE 405: Design of Steel Structures - Prof. the change in preload at any given temperature for a given time can be calculated, and the affect compensated for by proper fastener selection and initial preload. I have any number of hose clamps butdon't have a torque wrench that small so I can;t offer numbers in refutation. clamping force of A490 bolt). Sheet and plate metalwork 279 As the bending force is gradually increased these stresses, both tensile and com-pressive, produced in the outermost regions of the material, will eventually exceed the yield strength of the material. 67 = 0 (Where P is the clamp force on the handle bar). 05 Minimum length of engagement Rm (mm) [meffmin] 12. Calculate torque and effort force acting on the lever arm. believed that high strength A325 bolts permit a fairly equal distribution of the load among each bolt when the load has reached its ultimate value. Forces on an object are usually balanced (if unbalanced the object accelerates): The cables pull downwards equally to the left and right, and that is balanced by the tower's upwards push. The force transfer in either case is discussed in more detail later. • HDPE and bolt-on fitting connections are vulnerable to forces experienced with expansion/contraction of the pipe and require special consideration. (1) Pull-through generally applies only to self-clinching studs and standoffs and is not shown in this chart. • Determine the required torque: 14 Example Problem 6-1: Torquing Methods – Using C = 0. For choosing optimal clamp dimensions (thicknesses, widths, bolts number, diameters, etc. With the ANSI standard set, the calculation is performed in English units, with corresponding bolt dimensions also included. A Bolt Torque Chart will give the estimated torque calculations. COPPER AS USED IN ELECTRICAL EQUIPMENT Engineers (IEEE) publish the leading industry standards for the design and testing of electrical equipment. This calculator assumes standard bolt holes, with members stressed only in shear (i. Nut Factor (K Factor) When working with fasteners of different frictional characteristics, the Nut, or K, Factor is used in place of a calculated coefficient of friction. Torque Wrench is the general name for a hand-guided screwing tool, and used to precisely set the force of a fastening such as a nut or bolt. The increase of bolt force is ∆Fb and the decrease of clamping force is ∆Fp with the deformation of joint δp,ext. The efficiency of chain-CVTs depends on friction forces and slip between the chain and the pulleys. Calculate the average, standard deviation, and percent standard deviation of the preload tensile force in the bolts at failure. the friction occurring under the bolt head and in the threads. The outer socket will rotate and tighten until the bolt reaches the required tension. bolt prying force calculation Action of the force in trying to cut through the material, such as of bolts, pins, rivets. The four basic elements of the Techlok clamp connector are hubs, sealring, clamps and bolting. 5 times the bolt diameter for full strength connection (assumes nut and bolt are the same material). The actuation of these mechanical devices can be manual or automatic by means of pneumatic or hydraulic means. Solved: Hi, In Moldflow for clamping force calculation (F = Proj. m, effective radius r e in m, frictional coefficient of brake lining material μ f & number of friction faces n are the key terms of this calculation. Snug tight condition is defined as the full ef-fort of a typical person as applied using an ordinary spud wrench. A bolt's clamping force, called preload, is generated as the bolt stretches during tightening. SILICON BRONZE HEX BOLT DATA. This vertical load is being resisted only by the clamping force which exists from the 2 u-bolts around the vertically oriented 2" dia. In high-temperature joints, adequate clamping force or preload must be maintained in spite of temperature-induced dimensional changes of the fastener relative to the joint members. It also introduced power screws which changes angular motion to linear motion, where it is similar in principle to screws and bolts. area * X times Inj. CE 405: Design of Steel Structures - Prof. Guidelines for U-Bolt Design www. Connectors Verbindungstechnik AG, rcherstrasse 53, CH-8317 Tagelswangen, Phone: 41 (0)52 354 68 68, Telefax: 41 (0)52 354 68 60. Start the tightening procedure by lubricating the nuts and bolts. Figure 3b: Progression of clamping force over torque in conventional sys-tems with clamping force offset and with hydro-mechanical torque sensors with a constant safety factor The LuK system, with its hydro-mechanical torque sensor, uses a constant safety factor, i. (b) If the allowable bending stress is 150 MPa, determine the. Schedule 40 pipe. is suitable for many joints, but in some cases, external tensile loads can reduce bolt clamping force to zero. Because those three bolts are carrying most of the load designed for six bolts, they are highly prone to failure. 0 [in] 1 F1554 Grade 36. The slots are made approximately 1. It is applicable, basically, to bolts, screws, studs and nuts made of carbon steel and alloy steel, whose mechanical properties are specified in ISO 898-1 , ISO 898-2 or ISO 898-6 , having ISO metric threads. If the clamping force is too low, the fasteners can work loose due to vibrations or movement between the component parts. construction of the transformer. WHAT DOES IT DO ? Clamping prevents the part from shifting or being pulled from the jig or fixture during the machining operation. Clamp Load Est. this value i get from some catalogue, is quite high in fact, i wonder it is the correct value, around 7000 newton, which is 1800 lbf for just a 5mm diameter screw. Grade 2 calculations only cover fasteners 1 ⁄ 4 “-3 ⁄ 4 ” in diameter up to 6″ long; for longer fasteners the torque is reduced significantly. Torque Why do we tighten screws？ T The purpose of tightening screws is to fix one object to another object. It is important for the v-band joint to have sufficient axial clamping force to prevent leakage and wheel damage. It is the clamping action of the bolt combined with the friction in the joint between the parts that enables shear forces to be transmitted across a joint. better than a traditional worm gear clamp. 17 Safety against stripping force to breaking force [SAE] 2. Linear spring calculations can be a hard task if you do not have all of the proper information needed. Procedure 12. Seems easy to test - two halves of a sample hose clamp arranged in a tensile load experiment with a force dyno and a settable inch lb torque wrench to collect data. The basic force model gives a very good estimation of the clamping force ratio of a pushbelt and is very well suited for calculating the minimal necessary clamping forces. Tightening torque values are calculated from the formula T = KDP, where T = tightening torque, lb-in. measured force the following graph is produced: Abbildung 1. K= T/N * 12/D Where: K = K or nut factor T = Torque N = Bolt Tension D = Nominal bolt diameter Example: ¾” x 2” TC Bolt. area, bolt tension, lubrication, fretting corrosion, etc. - One LC1D18xx, with screw clamp terminals, on the left hand side. Figure 1: The T-stub, anchor bolts in tension and base plate in bending, assumption of acting forces and deformations of the T-stub in tension. How External Loads Affect Bolted Joints. 5 times the rod diameter, minimum anchor bolt clamping force of 15% of the bolt yield strength is required 6. The amount of force on a fastener is called as torque. The friction force from the lower jaw of the clamp opposes the relative motion of block B. with tensile loads in which the bolts have been installed to provide a pretension in the installed bolt (clamping force on the faying surfaces), and with faying surfaces that have been prepared to provide a calculable resistance against slip. In order to keep the mold closed, this force must oppose the separating force, caused by the injection of molten plastic into the mold. Most accurate bolt torque calculator given its geometry and thread diameter, using vdi 2230 standard, Screw Clearance through the specific tool 3D model. • Describe a conical and a flat plate clutch. The methods selected to calculate the optimum torque values in our updated tables come from multiple prescribed sources. the thread galling prohibits achieving proper clamping in the joint. For the handle position given by a=10o and for a handle grip P=150 N, calculate the clamping force C produced. • Clamp load is approximately 75% proof load. The basic force model gives a very good estimation of the clamping force ratio of a pushbelt and is very well suited for calculating the minimal necessary clamping forces. • Optimal strength is created by converting radial clamping LATCHforce into axial sealing force. Bolts are lubricated to eliminate galling and to provide consistent clamping forces. 1 5SAC 18V5010 5SAC 18V7010 5SAC 18V9010 Each part number includes: 1. 1) Anchor bolts grouted in place 1/4 in. To initiate a new flange analysis, either a standard or user defined design must be selected. How External Loads Affect Bolted Joints. Nut height needs to be equal to 0. Furthermore lowers cost by eliminating the need for a washer. Bolt breaking force (N) [FmS] 87637. The clamping force is accomplished between the curved portion of the U-bolt and the crosspiece. The real force in Eq 7 is a function of the bottom of the pipe. It will be assumed for analysis purposes, that bolts are located precisely. For sealing drain bolts, gas and liquid The fixing force at this time is called the axial tension (tightening force), and the target of screw tightening is to“ apply an appropriate axial tension. The balance of the force is equilibrated by the reduction in contact between the plates. These fasteners are used to mechanically join or affix other hardware objects together, and come in many forms which include rivets, nuts, bolts, studs. Proper amount of tensioning of the bolts is vital. Clamp System Load Lines It is recommended that the two rings be within 70% of each other in radial and torsional (roll) stiffness, Reference 2. Morton Machine Works is a manufacturer of quality tooling components supplying to industrial distributors, catalog houses, and OEM's throughout the world. ABOUT AXIAL CLAMPING FORCE MONITORING AT POWER TRANSFORMER WINDINGS DURING THEIR ACTIVE LIFETIME Andrei Marinescu 1*, Carmen Livia Ungureanu 1ICMET Research Development and Testing National Institute for Electrical Engineering, Craiova 200515, Romania,*E-mail:[email protected] SOLUTION • Calculate lead angle and pitch angle. Furthermore lowers cost by eliminating the need for a washer. How to Solve Uneven Clamping Of the hundreds of variables involved in injection molding, clamping mechanisms and platens often get less attention than they deserve. U-bolts, stainless steel, galvanised, zinc plated, backing plates and a range of exhaust pipe clamps, clamps, clips, fasteners, chandlery , shackles, $ USD € EUR £ GBP Login WELCOME TO U-BOLTS-R-US THE ON LINE STORE FOR GRAPHSKILL LTD. EDP: 9042990250800 - Click to view details about this item. by the V-band clamp provides the clamping force required for the joint. The clamping force used should take care of the cutting forces likely to come and. A Free-Body Diagram (FBD) is a sketch of an object with everything else stripped away, and replaced with all the forces acting on the body. 5x the bolt diameter is considered a "good" length of thread engagement however the required clamping force can, in some cases, be attained with less engagement - as shown in the table. On the go? Download our Bolt Load Calculator app instead. The time available for the absorption of impact forces (the absorption rate) will also affect the degree of injury. In actual shear stress distribution, it is not uniform and the maximum shear stress will be higher than the average shear stress. Restraint must be considered when joining plain end pipe to ensure against pipe pull out. MITCalc Force shaft connection - Geometric designs and strength checks of force couplings of shafts with hubs (Interference fit, clamping connection). 1 Bolts Fasteners pass through clearance holes in both parts. Tightening torque values are calculated from the formula T = KDP, where T = tightening torque, lb-in. A=Pipe flow area (m 2) b=Pipe angle shown in the figure above (valid range is 0 to 2π radians or 0 to 360 o) d=Liquid (or gas) mass density (kg/m 3) D=Pipe diameter (m) F=Resistive (reaction) force (N). clamping force of A490 bolt). In order to keep the mold closed, this force must oppose the separating force, caused by the injection of molten plastic into the mold. To allow for this effect, the Interaction Equation of AS 4100 (Rule 9. Figure 4- Exploded view of saddle clamp Seat rail clamp Seat rail clamp Compression wedge. If the applied torque increases, then the clamping force also increases. RAKENNUSTEKNIIKKA Olli Ilveskoski 30. In torque control, a specified torque is placed on the fastener, typically with a torque wrench. To ensure the joint is secure, a certain amount of clamp force must be developed - too much may cause warping of the joint or a broken bolt, and too little may risk a loose, unsecured joint. For compressor foundation, post-tensionin anchor bolts are used to prevent the generation of crack. To meet current market demands, designers require reliable material data and. based on the size of the bolt and clamping force required. Generally, flexible joints lose bolt load. Insert T-bolts and hand tighten nuts. That is, the bolt should be sized so that its clamp force is equal to the external load after a factor of safety has been included. Fp= Preload Force Fc = Clamping Force Fs = Shear Force Ft = Tension Force. The unit for the required mold clamping force is N (Newtons), or kfg, of tf. Screw Jack Calculator - without Friction - Imperial Units. For the condition with prying, the force on the bolt is the applied tension per bolt plus the prying force, q. Also called the fastener preload or initial load. To prevent riser damage, a three-jaw gripping system with a six-point gripping arrangement is used. For practical purposes, the clamp force in an unloaded bolted joint is assumed to be equal and opposite of the preload. S = Support spacing (ft) (page 2-1, table 1). that the bolt cutters had longer handles and thus gave you more leverage, and that is partially correct. these bolts has not been favoured for use on Indian Railways. Carbon steel will corrode as long as oxygen is present. thats what i have been told. The nut has to be strong enough to be able to impart the necessary torque to the bolt and also withstand the force during the life of the structure. For a more accurate calculation contact your moulding machine supplier. • Threaded rod, not bolt, inserted is through the plates –secured with nut • Clamping force applied using a hydraulic cylinder 49 ± 0. bolt (torque) at some point causes it to stretch (tension). We call this force to fix axial tension. Grade 2 calculations only cover fasteners 1 ⁄ 4 "-3 ⁄ 4 " in diameter up to 6″ long; for longer fasteners the torque is reduced significantly. Clamping forces may be transmitted by a number of mechanical means including screw, cams, levers or wedges. When you place your hand in front of this hose, you will feel the force of the water. A rule of thumb is to load the bolt to 60% of the material’s yield strength[5]. These can theoretically be mathematically calculated, but calculation is difficult in many cases. SPIROL strongly recommends not to exceed 75% of proof load. Clamp loads are based on 75% of the minimum proof loads for each grade and size. For a clamping force equal to 25% of. Bolts are lubricated to eliminate galling and to provide consistent clamping forces. Bolt length calculation Tekla Structures uses values from the bolt catalog and the bolt assembly catalog when calculating the bolt length. Fasteners Nut Bolt Weight Calculator, Check bolt weight calculator in mm, bolt weight calculator in kg, hex bolt weight calculator, foundation bolt weight calculator in kg, ss bolt weight calculator, nut weight calculator in kg. They are placed under the head of a bolt or above a nut to distribute clamping force and prevent fasteners from pulling through materials. SAE bolt torque and strength specification. The greater the resistance to turning, the greater the torque or force required to turn the item. In this example the tie force is less than the shear force. ) Suggested Tightening Torque1 Values To Produce Corresponding Bolt Clamping Loads Notes: 1. In addition to offering a full line of standard components, Morton has the engineering experience and capabilities to produce custom parts to your specifications. It is a function of the materials' frictional characteristics, which are based on surface finish, coatings and so on. Demonstrate how to calculate the load on the sling using the load angle factor for various load angles. You could use F + B/2 + 6 which is the distance from the top of the U to the bolt tips. Torque = Force × Distance to fulcrum × sin (θ) Remember that work was also force multiplied by the distance, but it was the dot product and used the cosine of the angle between the force and distance: force × distance × cos(θ). An example is where the applied torque must fall within a defined window of acceptability when reaching a specified clamp load. Smaller rivets and bolts are, of course, very important, but strength is not such a prominent matter in their design. clamp the parts together. Eccentric Clamp Bolt SLEC-B of NBK, Check out the variety of configurable, Eccentric Clamp Bolt SLEC-B of NBK,MISUMI has other mechanical components, Press Die, and Plastic Mold products available. 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. A screw thread is essentially a variation of a wedge or inclined plane and can provide very high mechanical advantage before you even consider the leverage of the wrench/driver used. This interfacial shear is due to the clamping force applied by the bolt when it is torqued down. · The fatigue strength of bolt under repeated load should not exceed the speciﬁed tolerance. The 4 bolt face plate spreads out clamping pressure thru the 4 bolts, so that each bolt will only need a fraction of the 9Nm to effectively clamp a handle bar in place. The clamp is a steel collar around a 2800mm DIA reinforced concrete pier, with a four (4) bolt configuration each side of the clamp. (Equation 26) DB L Equivalent diameter of torque bearing surfaces (Equation 53) d2 L Effective diameter of internal (nut) threads db L Nominal bolt diameter and externally threaded material. Input is similar to the pipe flange design program, with: input data panels (see right, top & below) specific to the pipe connector hub, clamps, bolting, and gasket. The reasons for this lie in the dispersion range of torque values and the overall coefficient of friction, i. , m) F = the clamp load tension force (lb. Keep the joint straight during assembly. Thread Standards and Definitions. area, bolt tension, lubrication, fretting corrosion, etc. In the case of a connecting rod bolt, the clamping force must exceed the tensile load imparted by the attached components during high rpm operation. Unfortunately, for large-scale production, no particular method has yet been developed to allow us to do this. Though this load may seem straightforward to calculate when dealing with forces that are directly up and down or side to side, it is not so straightforward to calculate when the force vector is pointed in a direction between these two absolute poles. They are of two types, metric flange bolts and metric hex bolts. Chapter 2 Review of Forces and Moments 2. , bolt fatigue), bolt preload can make all the difference between a safe, long-‐lasting structure or catastrophic failure. 785 in^2 gives 143kg. For a realistic analysis of the two designs different calculation algorithms and different gasket factors are required. This preload ensures that the clamped parts remain in contact and in compression throughout the life of the joint. Steam Turbines: Force/Moment Calculation 1 Comment NEMA – SM 23 requires that the forces and moments acting on steam turbines due to the steam inlet, extraction, and exhaust connections should be evaluated by simple set of force/moment calculation similar to centrifugal compressors. 2) The force of the tightening torque is the force at the effective diameter of bolt (2*torque/D), which equals the clamping force multiplied by a geometry factor involving the helix angle of the pitch (pitch * pi * D). I am an Mechanical Engineer and work in the vehicle repair industry. CE 405: Design of Steel Structures – Prof. • Clamping force applied using a hydraulic cylinder 49 ± 0. CFA Article - Tightening torques explained 2 of 4 Ensuring best fixings practice So we have established that there is a direct relationship between the torque and the clamping force we are looking for. In this tutorial we will discuss about all the design parameters except the selection of washer. Force can be described as the amount of push or pull between two objects. the change in preload at any given temperature for a given time can be calculated, and the affect compensated for by proper fastener selection and initial preload. · The proper axial tightening force for a bolt should be calculated within an elasticity range up to Load 70% of the rated yield strength when the torque method is used. The clamp force generated by a bolt can be indirectly controlled by regulating the applied torque. clamping forces. between plies in areas adjacent to the bolt or bolt group in bringing the joint into ﬁrm contact. be roughly 5 to 10% of the force used to install the fastener. The tightest bolt can end up doing the work of 4 or 5 bolts, and as a result, finally fail. CH-8 LEC 36 Slide 4 Dr. For example, a 4-bolt faceplate on a stem with a maximum torque value 9Nm printed on it may not mean tighten each bolt to 9Nm. • Pre-stressing the clamp to its rated force prior to actual. • Threaded rod, not bolt, inserted is through the plates – secured with nut. The total is 1,852 inches lbs. For Steel: Material Thickness X Inches of Cut x 25 = Press Tonnage Example:. ~ Tite-Force ~ Torque Calculator for bolts, flanges and clamp. Conclusion The minimum clamping force which are enough to hold the workpiece are determined. – Force paths at different levels – Mechanical behaviour – design aspects • Basic force transfer mechanisms – Compression – Shear –Tension – Bending - torsion • fib Bulletin on –Structural connections. Browse our Pictorial Index, or use the Search bar at the top of this page to find the product you’re looking for. Grade 2 calculations only cover fasteners 1 ⁄ 4 “-3 ⁄ 4 ” in diameter up to 6″ long; for longer fasteners the torque is reduced significantly. The stretch of a bolt or metal rod loaded in tension is calculated by use of the following equation. Since clamping force is a function of the condition of the U-bolt, the damaged threads of the used U-bolt will make reaching this force very difficult. (Equation J3-1) ΦRn =0. Finally, the structural behavior of the bolted joint was analyzed in terms of stress distribution, deformation state by varying clamping force and. The calculated value is the minimum amount of force needed to exactly offset the cutter forces generated. The clamping force is the main factor that is needed in controlling a fastened joint. 5 Clamping force calculation 7. It is desirable that a U-bolt be tightened or loosened quickly and efficiently. Eccentric Clamp Bolt SLEC-B of NBK, Check out the variety of configurable, Eccentric Clamp Bolt SLEC-B of NBK,MISUMI has other mechanical components, Press Die, and Plastic Mold products available. Guidelines for U-Bolt Design www. · The proper axial tightening force for a bolt should be calculated within an elasticity range up to Load 70% of the rated yield strength when the torque method is used. It takes more force to tighten a 3/4-10 bolt than to tighten a 318-16 bolt because it is larger in diameter. It is the clamping action of the bolt combined with the friction in the joint between the parts that enables shear forces to be transmitted across a joint. To initiate a new flange analysis, either a standard or user defined design must be selected. Before restarting a serial machining operation and in between the maintenance intervals the clamping force should be checked by means of a load cell. When using high strength bolts, we can apply the same level of axial force with smaller bolts. Bolt breaking force (N) [FmS] 87637. The unit for the required mold clamping force is N (Newtons), or kfg, of tf. Conclusion The minimum clamping force which are enough to hold the workpiece are determined. connector: A device that joins two or more conductors for the purpose of providing a continuous electrical. Torque Calculation. 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). 6, strap clamp is usually made to at least the same width as the washers under the head of the bolts used to tighten the clamp. Custom Bolt Tightening Solutions Standard Product Bolt Tightening Solutions We are very aware that there are many diverse and spe-cialised types of bolted joints being used throughout the industrialised world. because it can be used to more-accurately calculate bolt stresses than using the sum of preload and external load. The following is based on the use of proper size U-Bolt clips on new rope. In fact, this is the main function of the clamping force. 2 dGEOMETRY OF THREAD Look at Figures 5. Torque Dry: Assumes a coefficient of friction of 0. · The proper axial tightening force for a bolt should be calculated within an elasticity range up to Load 70% of the rated yield strength when the torque method is used. unusual for the bolt to be overloaded. The goal of this thesis was to find actual profile and splice plate stresses and bolt shear forces of the splice with FEA model and to study, how the corresponding results can be achieved with a theory, where stresses and bolt shear forces are calculated by the stiffnesses of the parts. • Threaded rod, not bolt, inserted is through the plates – secured with nut. Preload or clamping force in the bolt is achieved by using a torque wrench. This is the force required to "push" the spring into the flat position. 0 BOLTS AND BOLTING Bolts used in steel structures are of three types: 1) Black Bolts, 2) Turned and Fitted Bolts and 3) High Strength Friction Grip (HSFG) Bolts. I have set the connections between the clamping structures and the plates as frictional, with a coefficient of 0. Before restarting a serial machining operation and in between the maintenance intervals the clamping force should be checked by means of a load cell. With too little clamping force, the joint may loosen. total clamping force, damping force per bolt at 90% proof load strength, amount of force per bolt, find the required number of bolts to hold the hydraulic cylinder together, solve for bolt spacing requirements, estimate a safety factor based on proof load strength, nut shear. Clamping force Bolt Vc Max. If the bolt is torqued all the way to proof, the bolt will. 20 Torque Lubricated: Assumes a coefficient of friction of 0. 68 181027 181056 900 914. Torque application increases tension in the fastener and clamping force between components. Custom Bolt Tightening Solutions We aim to provide special tensioner solutions within one week of receiving the enquiry. Bolt Load Calculation Software Hydratight introduces Informate: the next generation of software that provides bolt loads and tool pressures on a huge range of flanged joints and clamped connections. The nut has to be strong enough to be able to impart the necessary torque to the bolt and also withstand the force during the life of the structure. ) and the proper preload of the bolts a set of design rules has been developed in order to achieve acceptable stress levels in the clamp at maximum design load and sufficient friction capacity in case of torsional loads. Preload or tightening torques. Enter the force applied perpendicular to the lever arm. Pressure is the resistance to flow of a liquid, and is in part responsible for creating the force in a hydraulic system. 555 N # m-80 cos 15°(0. 05 Minimum length of engagement Rm (mm) [meffmin] 12. bv = actual shear force on the bolt. At Tensile Area of a bolt used for thread tear out calculations (See Section 8. With the ForceCheck collet force gauge, the clamping forces on collets and hydraulic tool holders can be measured to obtain accurate machining specifications while fulfilling ISO standard requirements. The calculator below can be used to calculate the torque required to achieve a given axial bolt force or load. Finally, the structural behavior of the bolted joint was analyzed in terms of stress distribution, deformation state by varying clamping force and. clamp force comes from bolt load. Birkemoe and IN. This is the moment of force or turning force generated by a force applied at a specified distance from the axis of rotation. What happens if full contact cannot be achieved between faying surfaces of slip-criti-cal joints? Slip-critical joints rely on a clamping force (between the faying surfaces) that results from installed pretension in the fasteners. Since one side of a brake chamber diaphragm is exposed Page 2 For example, if 60 psi is admitted to a type projections for rotochambers and bolt projections for 30 brake chamber, the lineal force on the end of the push clamp type brake chambers. 1/2'' the pretension torque is 65 ft. Clamping force Clamping force CON-EDML-039 WORK HOLDING REVISION AA-06/21/2011. Pressure) , does it use any safety factor (X) for calculation. In a cyclic condition, if the cyclic stress does not exceed the pre-load stress, then the mean fatigue.