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  • Users: KevinH673
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  1. KevinH673

    Bending a pipe

    If you are bending a pipe similiar to this picture: http://image.shutterstock.com/display_pic_with_logo/85366/85366,1246641681,4/stock-vector-illustration-of-a-powerful-man-bending-a-rod-33069904.jpg Do you still analyze it as a cantilever beam held on both ends? I would assume you would use...
  2. KevinH673

    Bearing for optic travel

    Could anyone recommend a good bearing manufacturer for tight tolerance applications? I have a metal optic holder(CAD drawing picture provided) holding an optic. I would like to use some linear ball bearing to slide this metal optic holder on rails that would eliminate almost any "wobble" down to...
  3. KevinH673

    Stress/Deflection of Plate

    I'm working on some stress analysis for work. I'm designing a plate, part of which is meant to deflect under a load. Due to this sheet metal plate being somewhat non-straight forward geometry, I'm unsure if I'm attacking it correctly. I'm putting symmetrical cuts into the plate to allow for...
  4. KevinH673

    Most common steel sizes (plates, tubing)

    I am working on changing a machine design from metric to US standard; however, I am vague on what sizes are harder to find than others. Ive been told the 5/16" thick plates Ive been using are tough to find, to replace the 8mm thick plates currently used. Same for the 5/8" plates to replace the...
  5. KevinH673

    Heating from laser (q) on copper beam dump

    I'm attempting to analyze the heat on a 'bump dump' and could use your help in modeling the equation correctly. I have a laser beam coming through an optic and hitting a copper beam dump of certain surface area, A. The laser is emitting a power, q, in Watts. The copper beam dump is surrounded...
  6. KevinH673

    Pressure Drop

    This one goes towards the same redesign from my previous question on axial force from torquing a screwed in piece (though unrelated). A picture of what I'm working on: http://img13.imageshack.us/img13/1653/32593323.jpg I have water flowing at a specified GPM between the green "rod" and the...
  7. KevinH673

    Torque (Pitch/Bolt) to Axial Force

    I have an assembly in which I must translate torsional force (a torque from screwing in a piece), that pushes against a silicon ring, which pushes against a metal piece. I'm interested to see if the piece will deform or fracture. I do not have the specs for the spring constant for the silicon...
  8. KevinH673

    Pump head in pipe with changing diameter/area

    I have concentric (annulus) pipes with water flowing through them. The inner pipe is solid, with water obviously flowing between the outside of the innner rod, and the inside diameter of the outer rod. Currently, there is 10 mm diameter small rod, and a 15 mm inside diameter on the outer rod...
  9. KevinH673

    External flow heat transfer, concentric pipes

    Hi guys, I have what I assume is a pretty basic problem but haven't found the correct formulas in my heat transfer book (I'm a bit rusty, admittedly). There are two concentric pipes (I believe it's referred to as annulus). The larger diameter has water running through it, to pull heat away from...
  10. KevinH673

    Thermally conductive, electrical insulator

    I'm sorry for double posting this, as I've already posted this question in the Metallurgy forum; however, this may be a problem who's solution is a polymer. I'm interested if there is a material I can use in a 1/2" thick piece I have, that will dissipate heat (it is up against a cold plate)...
  11. KevinH673

    Thermally conductive, electrical insulating material?

    I'm interested if there is a material I can use in a 1/2" thick piece I have, that will dissipate heat (it is up against a cold plate), yet will electrically insulate. Can anyone recommend anything? Am I better off posting in the composite forum? I found a polymer composite with boron nitride...
  12. KevinH673

    Flow rate inside concentric tubes

    I have a problem dealing with concentric tubes. Technically, the internal one is a solid rod, and the flow is flowing between the inside of the large diameter tube and the outside of the rod (of course). Current flow rate is 9 gal/min. The inside rod is 10 mm, and outside tube is 15 mm (internal...
  13. KevinH673

    Electricity/Wire transfer to Copper

    I have a wire to be soldered into a copper piece. The wire is rated at peak current of 1300 A (peak voltage is 880V). I am interested in how hot the copper piece will get from the current running through the wire, so I can determine the cross section I need to make the copper piece (it will be...
  14. KevinH673

    Axial force on a torqued bolt

    Say I am tightening a bolt at a specified torque, what is a calculation to find the axial force that bolt is pulling the material? I've found T=0.2*D*F where T=torque and D=diameter of bolt. Is this correct?
  15. KevinH673

    Deflection/Stress from Compressed O-Ring

    This may seem like a trivial problem, but I'm a new Engineer and the stress I am calculating from an O-Ring compressed roughly 30% seems a bit high, and am looking to see if I did this correct. I have included the .pdf of my hand calculations My stresses calculated are 16 ksi and 28 ksi, which...

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