Alignment, wear of elastomeric element, bolt torques, and exing The greater the axial distance from one flex plane to the other), the greater the parallel misalignment. Due to less misalignment, there is less movement in the parts.
Shaft Alignment Tolerances
As an example, a machine with a short flexible coupling running at 1800.
For coupling diameters of 100 mm or 10.
Rexnord® thomas® flexible disc couplings overview a flexible coupling is a device used to connect the ends of two shafts, transmit torque, and at the same time, accommodate slight misalignments which develop in service. Just because a flexible coupling can tolerate some amount of misalignment, does not mean it doesn’t need to be precision aligned. Measuring in the horizontal and vertical planes produces four deviations, each of which must be within the specified tolerance values. There is an ongoing debate on what tolerances are acceptable when aligning your rotating equipment.
The primary functions of all flexible couplings are:
Decreased mtbf, longer life expectancy, longer bearing and seal life. To transmit power from one shaft to another, efficiently and. • up to 72,480 in.lbs.; Tolerance table offers guidelines how accurate should alignment be?
Shortly after initial operation and periodically thereafter, where applicable, inspect coupling assembly for:
If actual coupling diameter is required, multiply the value from the table by the appropriate factor. If coupling assembly vibrates or makes beating sound, shut down immediately, and recheck alignment. It is important, therefore to check the coupling for alignment with the setting gauge supplied before tightening the grub screws in the two hubs on their respective shafts. For a flexible coupling to accept both parallel and angular misalignment there must be at least two points where the coupling can flex to accommodate the misalignment condition.
Nylicon gear type flexible coupling compensates for a certain amount of misalignment, its life is greatly increased if any errors present are reduced as much as possible.
Coupling assembly should operate quietly and smoothly. (rpm) metric (mm) inch (mils) soft foot any 0.06mm 2.0 mils align machine to within “acceptable” tolerances based upon coupling type and rpm short flexible couplings acceptable excellent acceptable excellent offset 600 750 1500. The longer the sleeve (i.e. € (rpm) metric (mm) inch (mils) soft.
Values, the flex plane angles are used in the standard to establish alignment tolerances for flexible couplings.
Optalign® plus uses ’happy face’ symbols to show compliance to tolerances based upon coupling type and rpm € € € ’ex c elnto ra s fu i d € € ’a c ep t ab lo r n s fu i d € (no happy face+ ’bad’ = out of tolerance: The debate falls on the “published tolerances” provided by the coupling manufacturers and the tolerances “recommended” by alignment equipment companies, reliability associations and rotating. Coupling alignment fundamentals rexnord, 5555 s. In most cases a quick glance at the table will tell whether coupling misalignment is allowable or not.
Flexible couplings benefit from precision alignment just like other types of couplings or rotating machinery.
This leading to less axial and bending stresses development in the shafts. The flexible coupling is designed to calculate the torque and power transmission, considering the misalignment in any direction. When comparing the minimal ansi tolerances to the tolerances of the jaw coupling in thou:
