How do you determine tight torque?
The Torque/Tension Equation is a method used to estimate the torque/tension relationship in an assembly. T = (K D P)/12 can be used to developt a torque value that will achieve a certain tension or clamp load. T = Torque (ft. -lbs.)
What is rundown torque?
If the threads are damaged or covered with dirt, you can feel some resistance before the fastener actually pulls the parts together. This is called “run-down” torque. Then, as you apply more torque, the nut does NOT move until you reach a higher value of torque.
What torque should I use for screws?
The reason all applications should be evaluated to determine the optimum tightening torque is that the K factor in this formula is always an estimate. The most commonly used bolting K factors arc 0.20 for plain finished bolts, 0.22 for zinc plated bolts, and 0.10 for waxed or highly lubricated bolts.
Is tension equal to torque?
However, they use different means to accomplish it. “Torque” is simply a measurement of the twisting force required to spin the nut up along the threads of a bolt, whereas “Tension” is the stretch or elongation of a bolt that provides the clamping force of a joint. The finish used on the bolts.
What causes a fan to wobble?
Balance the Ceiling Fan Blades Ceiling fan wobble is caused by imbalances in the fan blades or blade holders, misalignment of blades, excess dust accumulation or just loose ceiling fan mounting. Restore your fan to its smooth-running days of old before you wear down the moving parts.
How do you calculate friction torque?
The frictional torque, therefore, is calculated as the difference between the applied torque and the resulting net, or observed, torque.
How do you do running torque?
Run the nut down to near contact with the washer or bearing surface and check the friction drag torque with a dial type torque wrench for the torque required to turn the nut. Add the friction drag torque to the desired torque.
What is tightening torque for bolts?
Torque tightening is the accurate application of torque to a nut so that a bolt can hold its load securely without breaking.
When to adjust tension on belt driven fan?
All belt manufacturers recommend re-adjustment of tension shortly after installation of the new belts (e.g. 24 hours of operation). This information should be passed on via notes in the TAB report or conveyed to the maintenance staff at some point.
How to calculate pitch diameter for belt driven fan?
1. Do not roll the belts off and on the sheaves while they are under tension. Relieve the tension prior to belt removal or replacement. 2. Use Pitch Diameter (PD) when calculating sheave diameters and belt lengths. (Outside diameters vary between manufacturers.)
What should I know before replacing a belt drive fan?
1. Do not roll the belts off and on the sheaves while they are under tension. Relieve the tension prior to belt removal or replacement. 2. Use Pitch Diameter (PD) when calculating sheave diameters and belt lengths. (Outside diameters vary between manufacturers.) 3. Double check sheave bore sizes before ordering replacement sheaves.
Is there a way to measure the tightening torque?
The problem is that there is no practical way to measure the clamping force in normal production situations. Consequently the value of the clamping force is usually referred to as the tightening torque.