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  • Users: USMechE6
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  1. USMechE6

    Buckling Boundary Condition

    Hello, I am doing some calcs for a machine that uses a hydraulic cylinder, and I cannot find the Euler effective coefficient for the boundary condition as follows: Both ends guided translationally plus one end being hinged/pivoted/pinned/whatever notation you use. One end is of course the...
  2. USMechE6

    Altering Magnetic Field Strength at a Radius

    Hello, Please forgive my lack of knowledge on magnetism. I have an application in which I need a ring magnet of fixed strength on a piston to trip a sensor (reed switch) a certain radius away from the axis of travel (greater than the OD of the magnet). The sensor requires a field strength of...
  3. USMechE6

    Cartridge Valve Interchangeability

    Hi All, We currently are using a Sun CKGB-XCN in our hydraulic manifold. It needs to be replaced and I am considering Eaton 4SK140-3-S based on part availability. The application specs (pressure, flow, etc.) seem to be a match but I am not familiar enough with size standards to know if they can...
  4. USMechE6

    Check Cartridge Size/Interchangeability

    Hi All, We currently are using a Sun CKGB-XCN in our hydraulic manifold. It needs to be replaced and I am considering Eaton 4SK140-3-S based on part availability. The application specs (pressure, flow, etc.) seem to be a match but I am not familiar enough to know if they can be interchanged...
  5. USMechE6

    Combining Stresses

    Hi All, I need help calculating the combined stresses (max/critical stress) on the journal of a ball screw to determine FOS. I got the torsional stress and the axial stress (compression and tension), but I cannot remember how to combine them. I am trying to refresh on Mohr's circle from class...
  6. USMechE6

    Help Sourcing 4150 HRC Flat or Alternative

    Hello, I am need of providing a surface for a 440c roller that's mildly corrosion resistant. I thought hardening 4150 to HRC 60 and chrome plating would be perfect. I've seen this for round but cannot find anything flat. Does anyone know if it's even made flat (plate/sheet/strip)? I'm...
  7. USMechE6

    DA Hydraulic Cylinder Using Air on One Side

    Hello, Depending on the model, can a double-acting hydraulic cylinder be fed pneumatically on one side? The port is currently not being used and just has an air filter. It would be a much simpler retrofit for us to tie into our plant air.
  8. USMechE6

    Bearing Journal Rebuild

    Hello, We have a shaft's journal damaged from a locked bearing and are looking at options to refurb it. I know there are some processes to deposit more material down and then turn to spec - can anyone provide some guidance/considerations for what to select? I know bending stresses, thermal...
  9. USMechE6

    Thread Standard Question

    Hi All, I'm selecting a thread standard for a nominal 1-9/16" diameter engagement, but am confused by what I see in Machinery's Handbook. The internal threads/inch of 6, 8, 12 and 16 are all listed as UN, then 18 is listed as UNEF and then 20 is listed back at UN. Can anyone explain why the...
  10. USMechE6

    Relative Wear

    Hi All, I'm looking to try to predict the wear rate of steel on Delrin TM. I know that Delrin TM will wear at a rate orders of magnitude faster than the steel, but that the steel will still wear as well. Does anyone know of anyway to estimate this? I've looked at the Archard equation, but it...
  11. USMechE6

    Long-Stroke Rodless Hydraulic Cylinder

    Hello All, I'm looking to replace vertical lift of ours that utilizes a chain-over-roller hydraulic cylinder, with a 93" stroke that carries a drum (and conveyor) up about 163". I would like to use our current hydraulic system (for various reasons) so I am considering moving to a rodless...
  12. USMechE6

    Shaft Dynamic Balancing

    Hi All, I am trying to understand if there is a minimum shaft speed above which I should spec dynamic balancing over static balancing. I realize it depends on the specific application but I wasn't sure if there was some general rule of thumb or interpretation from a standard. I've looked at...
  13. USMechE6

    Beam Fatigue Deformation

    Hi All, We have a manipulator arm with a large central vertical shaft that after about 20 years of use has developed a slight bow to it. I don't know if this was due to some specific event or from cyclic loading, but it has the entire system skewed. To replace it, I want to consider some...
  14. USMechE6

    Delrin Set-Screw Fastening

    Hi All, We recently had a steel set-screw (supposedly Loctited) back out on a moving part of one of our critical machines, causing a whole lot of damage and expense. Talking about a $1 item damaging a multi-million dollar piece of equipment. One thing I am considering moving forward is to put...
  15. USMechE6

    17-4 Forging Metallurgy

    Hi All, I'm tasked with specifying a hollow cylinder to be made out of 17-4 PH (H900 heat treatment) and to be used in a high pressure and wear application. The O.D. will be 12" and it will be in excess of 100" long. I can't go into too much more detail but I'm hoping for some insight into...

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