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  1. petar yovchev

    Reversing Battery poles

    Hello Guys, The car is Mercedes E220 Diesel After replacing the starter motor the car the engine won't start I reversed the poles of the Battery by mistake for a 1 second What could've happened in this case I'll be grateful for some help!
  2. petar yovchev

    Cast iron for gears

    Here are the parameters of the gear couple: https://files.engineering.com/getfile.aspx?folder=5abd4ab0-d29f-4135-a8c9-3d1e18b57638&file=Gear_transmition_-__parameters.pdf The lubrication is in grease. It is for a machine that I invented and I am going to apply for an utility model. I am trying...
  3. petar yovchev

    Cast iron for gears

    Thank you for the advices I checked experimentally at home wear resistance of the cast iron and some other materials by friction under certain pressure for certain time at speed 0.35m/s, over greasy and smooth surface (outer ring of ball bearing). I applied 240N (54lbs) of force over...
  4. petar yovchev

    Cast iron for gears

    Hi there, What kind of cast iron is usually used for gears?.What are the advantages and disadvantages of that compared to the steel gears? Does the teeth surface need further machining or that achieved of the casting process is good enough? Thanks in advance!
  5. petar yovchev

    steel strength

    TVP,You probably mean it shouldn't be less than ~ 2200 MPa And in conclusion I accept it's normal automotive shafts to withstand 1500+ Mpa. But I wonder what is the predetermined stress in the design of high strength auto parts like drive shafts ets
  6. petar yovchev

    Choosing material for Differential cage

    In my thesis I'm designing a differential. After simulation in Catia V5 for max stresses in the cage I obtained 770MPa (112ksi) compression and 760MPa (110ksi) tensile stress. What kind of material I have to choose in order to be within max permitted stress values? What materials are used for...
  7. petar yovchev

    steel strength

    Next time I thing to test a shaft in torsion if find where to spline it. Shafts OK but what about the low carbon steel shouldn't its ultimate strength be about 350Mpa(51ksi) not 800MPa (116ksi)
  8. petar yovchev

    steel strength

    I'm absolutely sure in the values, I did it twice, there was no deformation at all. It's an ordinary hardened shaft, I don't know from what machine,I have plenty of scrap like that at home. Today I tried with another metals and the results was also amazing. -Drive shaft from a car Φ22 in...
  9. petar yovchev

    steel strength

    I applied a cantilever load. I pushed one side in a hole and step 30cm away from the hole with my body weight (90kg). Bending moment = 882.9N x 0.3m = 264.87Nm (264.87Nm x 32)/(π x 1.2cm ^3)= 1561MPa. If add the shear and contact stress it must've exceed 1600MPa I did that experiment in order to...
  10. petar yovchev

    steel strength

    Hi guys Is it possible a steel to withstand 1600MPa in bending, because i'm a witness of that by applying 260Nm (90kg x 0.3m)bending moment of a shaft Ø12, It withstood it even without crook. According to the formula σ = (32.M)/(π.D^3) = 1532MPa Is that true or I'm wrong in the calculation...

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