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  1. uh60rascal

    General geartrain questions

    The bottom shaft (blue) is supported by bearings that are not displayed, but the other two gears are cantilevered. I don't know if I effectively communicated the scale of this design, but the gears have only a 10mm face width with a 5mm hub (except for the idler, which is hubless). So they...
  2. uh60rascal

    General geartrain questions

    So is there a way to use retaining rings and keys together? Or an alternative approach? This seems like an extremely elementary question, but I can't seem to find anything about it on Google, Marks', or Machinery's Handbook.
  3. uh60rascal

    General geartrain questions

    Thank you, Brian and Terry. I appreciate your help. The top gear shown in the image is attached to the output shaft of my gearbox. Is there an alternative to trying to machine a groove in that shaft and insert e-rings? It seems like the key would get in the way, and also I don't want to risk...
  4. uh60rascal

    how to calculate the belt conveyor gear motor power

    Do you currently have a motor and you are trying to measure its power or you looking to calculate the motor power required for this application?
  5. uh60rascal

    General geartrain questions

    I am putting together a spur gear train to shift the axis of rotation several inches below the output shaft of a gearbox. The top gear is the pinion (20 teeth) then a 48-tooth idler, which is mounted on two flanged ball bearings to allow it to rotate freely on a fixed shaft, and finally another...
  6. uh60rascal

    Part COG in Assembly

    Well, I have figured out how to obtain my part COG's. Apparently the full output text of the Mass Analysis contains the density, mass, and COG (X,Y,Z) for each part or subassembly in the assembly. Just need to scroll down. Hope this helps if someone else ever finds themselves in a similar...
  7. uh60rascal

    Part COG in Assembly

    Not completely solved, but I have noticed that I get the correct answer (and orientation dictated by my chosen ref CSYS) if I do not activate the part, but instead suppress every other part except the one I want. This will be problematic when I need to measure the COG of a part whose placement...
  8. uh60rascal

    Part COG in Assembly

    Hi all, I am getting a major headache trying to calculate the COG of a part relative to a reference coordinate system in an assembly. I activate the part, go to mass props, uncheck default CSYS and select my reference. But when it performs the analysis, although it uses the origin of my...
  9. uh60rascal

    Shear stress of a gear mounted on a shaft

    Thanks, tbuelna, desertfox and hydtools! That Loctite reference is great. I appreciate all of your hope, although I think this is a sign that I've been away from the books for too long...
  10. uh60rascal

    Shear stress of a gear mounted on a shaft

    Thanks for the replies, guys. I'm still confused, so let me pose the question in a slightly different manner. Suppose I wanted a close (but not press) fit between the shaft and gear and I used Loctite to fix it together. The Loctite says it's good to 3000 PSI. Now I want to know from my...
  11. uh60rascal

    Shear stress of a gear mounted on a shaft

    Also, what do you mean by shearing across the diameter? If anything, I thought that would be shearing around the circumference (or maybe it is just semantics). F = T/r Surface area = 2*pi*r*l F/A = T/(2*pi*r^2*l)
  12. uh60rascal

    Shear stress of a gear mounted on a shaft

    I do want to calculate the shear stress on the shaft at the area of contact between the shaft and the gear. The problem with method 2 is that it seems to be independent of the contact area. My intuition tells me that the shear stress would decrease with a larger contact area, but method 2 does...
  13. uh60rascal

    Shear stress of a gear mounted on a shaft

    I'm a bit confused here. Trying to determine if we can mount a gear to a shaft and if it will be able to withstand the torque load or if it will slip. I need to find the shear stress. Two ways I can think about doing this: 1. F = T/r. Then calculate shear as F/contact area. Thus shear =...

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