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  1. CouplingGuru

    Diesel Driven Vertical Turbine Pump (875HP)

    This doesn't sound like a very complicated application. I am sure your coupling supplier will be able to provide a solution for you once you provide them the application specifics. When it comes to couplings we are always here to help. WWW.PSCCOUPLINGS.COM
  2. CouplingGuru

    Tolerance of Distance Between Shaft End (DBSE)

    The tolerance of distance between shaft ends of the placed equipment for most couplings isn't what is critical. It is the distance between mounting planes (hubs) that is critical. So when positioning the equipment, I would suggest using the coupling designed DBSE as the absolute minimum...
  3. CouplingGuru

    API 671 coupling , hydraulic fit , maximum pressure .

    JJPellin is correct, the hub will not explode. What will happen is it will yield at the weakest point which will compromise its usability when re-installing. If you have a coupling drawing we can provide you the calculation of where this point is. The tough thing about hydraulic fit hubs is that...
  4. CouplingGuru

    Motor pump bearing problem

    That is a fairly fast application for a gear coupling. 3000 rpm tends to cause the grease to move away from the lubricated teeth which then can cause a binding scenario and put a lot of axial force on the shaft. and If you have thermal growth this scenario would resist movement, further...
  5. CouplingGuru

    Coupling Angular Misalignment

    Electricpete, You are exactly correct, but all couplings are not created equal when it comes to restoring forces (reactionary forces). A couplings ability to withstand misalignment is mainly predicated on the design and material selection of the flex element. so although the fatigue limit of...
  6. CouplingGuru

    Coupling Angular Misalignment

    You get 0.75 degrees per coupling half. But the key thing to understand about misalignment it that all misalignment resolves back to angular misalignment of the coupling flex element. So the angular rating of the coupling flex element in your case is 0.75 degrees, but that is the maximum value...
  7. CouplingGuru

    Shaft Coupling

    in order to size the pins you need to use a combined stress formula. however being that you are using the bolts perpendicular to the shaft the stress in tension (axial) torsion (torque direction) will both resolve back to shear on the bolts. This shear will only apply once the friction carrying...
  8. CouplingGuru

    How to buy the right size of coupling disc packs?

    Shaharudin, You can replace the disk packs, however depending on the speed of the application you may have a balanced coupling. In that case you may want to replace the entire transmission assembly (adapter - disc pack- center member -disc pack - adapter) with another balanced unit. You may...
  9. CouplingGuru

    add or adjust backlash

    This sounds like a custom coupling with an adjustable torsion spring across the center member assembly. Won't be cheap but it would allow you the flexibility to adjust the backlash based on the desired level of torque you are trying to transmit. Increase the spring pre-load to decrease backlash...
  10. CouplingGuru

    Deep hole tolerance costs

    We have to make holes of that nature periodically for hydraulic relief ports. Granted our application isn't as tolerance critical, but because it is low volume we just ED bore them. It isn't too bad in price. If you are making 10,000 a year, may not be the way to go. But if you are making a few...
  11. CouplingGuru

    Worn Involute Spline?

    Splines are not meant to take up misalignment. This is an improper application of a spline. If this is a floating connection between 2 shafts, then you really need a coupling designed to take up misalignment. Once this spline starts to wear, little particles that get ground off will actually...
  12. CouplingGuru

    motor spline failure

    when it comes to splines, the most common modes of failure I see are as follows 1.) Dissimilar hardness, (typically the easier/less expensive to replace side is slightly less hard) 2.) Dissimilar designs, (Making sure the female and male are not only the right pitch but also similar...
  13. CouplingGuru

    Small pump with constant failures

    This would be a great case study for us. I see you are using a Woods Sureflex on a 3.5" BE. Because you don't have space to align, the ability to measure flex element gaps and aligning off of that would be a great option for you. If you don't get a solution, give us a call, this would be a great...
  14. CouplingGuru

    Vibration level increased after precision laser shaft alignment

    A very short distance between shaft ends makes alignment harder to achieve. So using cheap elastomeric couplings comes at a cost, in alignment difficulties and are prone to maintenance. With that being said, you have aligned the shafts or the coupling hubs? always align the shafts, sometimes...
  15. CouplingGuru

    Shearing bolts of the fixation of the coupling between the turbine and the generator (09 MW)

    Thanks for the picture, It looks like there is groove machined in the middle of bolt shoulder? Then it failed right through the middle of that. We would need a close up picture of the fracture surface to actually see how it started and if it follows classic shear or if there is striations which...
  16. CouplingGuru

    Shearing bolts of the fixation of the coupling between the turbine and the generator (09 MW)

    ismail06, With out photos it is pretty hard to diagnose the problem. However, a sheared bolt is 99% of the time due to over torque. The question is did you actually have a shear failure, with out pictures that will be tough to diagnose. One thing I would definitely look into though is thermal...
  17. CouplingGuru

    Repeated Feed Pump Bearing Failures

    jsalas1, Fluid couplings are great, but they aern't really "couplings" per say. A power transmission coupling's primary responsibility is two fold; Transmit torque and Take up misalignment. The fluid coupling is more like a clutch it does great attenuating torque spikes and allowing for line...
  18. CouplingGuru

    Dealing with unbalance tolerance on fasteners in high speed coupling (statistical vector combo?)

    Well said Tmoose, Abor balancing is inherently limited, It is much better to roll a rigidized coupling, but even then you will find that the biggest issue is your bore and how well it is placed inside the the hub in comparison to the geometric constraints in manufacturing. Lots of coupling...
  19. CouplingGuru

    Gearbox Backlash

    Gustavo, Seems like based on your numbers if you have less than a 3" pitch diameter sprocket coming off that gearbox you would be pushing that chain very hard, especially in a reversing torque application. I would recommend at least a 3" diameter, maybe even a 4" because of its reversing...
  20. CouplingGuru

    Gearbox Backlash

    Well sounds like the chain was the weakest link in the system, (no pun intended). And the operator pressed it too much and snapped the chain. What is the reduction ratio of the gearbox and the output shaft diameter of the gearbox? Direct coupling it will definitely solve the chain issue, but...

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