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  1. paulliu

    gear train engineering

    It shall be case-hardened alloy steel. The exact name of steel also depends on DP and the cost one can bear.
  2. paulliu

    Addendum Modification Coefficient

    The following book is recommended: "The geometry of involute gears" by John R. Colbourne, 1987,Springer-Verlag.
  3. paulliu

    Gear 3D contact simulation using ANSYS

    I've done these simulations many times by solving the 3-D elastic contact problems. The model included two gears, a bearing. No external help was used since I had confidence in these subjects.
  4. paulliu

    20deg. Vs 14.5deg.

    I believe that they'll run well if the following three conditions are met: (i) the two base circle pitches are equal (ii) the contact ratio is larger than 1 (iii) the center distance is set properly so that there is no interference
  5. paulliu

    Bevel Gear Rating Software

    Many gear design software are advertised in this page: http://www.geartechnology.com/product.php?a=Gear%20Design%20Software The company called Involute Simulation Softwares has sold bevel gear software. Also Gleason has commercial gear software to sell. Last Oct. at the Fall AGMA technical...
  6. paulliu

    Resistance of teeth for 10 ton lift

    I've run through a rating process. The answer is yes if the gears are at least through-hardened-heat- treated, and expect to run 300 hours, with AGMA Quality Q9. Warning: I am not liable to my estimate. More detailed and rigorous analysis are required if you really decided to use them lift 10...
  7. paulliu

    Resistance of teeth for 10 ton lift

    If you tell the torque applied to either the gear or pinion, I can give an estimate based on calculation.
  8. paulliu

    64-Bit Windows

    The 2GB memory limit was posed by the Windows XP operating system, not the ANSYS version or the ANSYS Inc. Over years, Microsoft has slowly upgraded the Windows operating system, first from 16-bit to 32-bit. Now we'll need the 64-bit upgraded from the 32-bit. The 64-bit system supports using...
  9. paulliu

    64-Bit Windows

    Yes, I plan to use 64-bit windows to overcome the limit of 2gb RAM. My PC has 8 GB RAM. But my ANSYS can only uses less than 2GB now to solve the contact problems. Thus it's slow now.
  10. paulliu

    Strength & size checks for small Bevel Gears

    Bevel gear design is a serious mechanical engineering subject. A acceptable approach is to follow the following standard: "ANSI/AGMA 2003-B97 - Rating the pitting resistance and bending strength of generated straight bevel, zerol bevel and spiral bevel gear teeth" AGMA has been creating a...
  11. paulliu

    Experience with Gearbox Manufacturers

    Canadian company Standard Machines, http://www.hamiltongear.com in Saskatoon,SA, can also design and make large gearboxes. I visited that company three years ago, and saw several large Niles grinders, which were bought from Philadelphia Gear when Philadelphia Gear. Gearbox technolgy is a mature...
  12. paulliu

    Transmission Gears

    Helical gears are preferred whenever possible. The pressure angle of 20 degree is OK. The 25 degree of pressure angle is alos widely used.
  13. paulliu

    PLANETARY GEAR

    The planetary gear drive with four planets will transfer more power/torque than that using three planets. There are many questions and answers in gear engineering.
  14. paulliu

    Step down motor

    Isn't the gearing ratio equal to 1500 / 62, i.e. 24.2?
  15. paulliu

    Ansys vs Abaqus

    The price of ANSYS is lower than the ABAQUS, the difference could be several thousands, because ANSYS is sold by the outside dealers. ABAQUS' fracture mechanics and contact problem solvers were better. Now such capabilities of ANSYS are also very satisfactory. ANSYS' own GUI is better than...
  16. paulliu

    FEA for stress analysis of the Gear teeth

    If you want to calculate the gear deflections, the FEA or BEM are the correct methods to use. The AGMA, ISO, DIN only provide the methods to calculate the stresses for the involute gears. For the non-involute gears, one will use these numerical methods to calculate the stresses too. In my...
  17. paulliu

    drawing an elliptical gear teeth profile

    I have a Gear Handbook (in Chinese) that teaches how to derive the tooth profile coordinates of the elliptic gears. But how to derive the coordinates of the fillet of the elliptical gears is not given in this book. In fact, Litvin's book of "gear geometry and applied theory" has a chapter that...
  18. paulliu

    Reduction gear 1000:1, is it possible

    haleemeng: Now for a speed reduction ratio of 10,000, a recent example I saw, employed two gearboxes with a speed reduction ratio of 100 for each of them, and each of which may use the harmonic gear drive, or worm-gear drive, or involute planetary gear-drive et. al.
  19. paulliu

    Reduction gear 1000:1, is it possible

    haleemeng: The existing rotary vector drive can have a reduction ratio of 1000, by using the involute gears for its 1st planetary drive, and cycloid, harmonic or Ikona gears for its 2nd planetary drive. But I also have several questions for you: (1) Does it require to be back-driveable? (2)...
  20. paulliu

    To find KHBeta

    LMGK: The following site lists some samples of FEA for gear 2D and 3D contact problems: http://www.ikonagear.com/casestudy_feaservices.html

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