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  1. Tmoore

    Fatigue Strength Reduction Factor

    Hi, Does anyone know how to determine what the fatigue strength reduction factor should be for a fatigue analysis of a part or assembly? I have read the help files both in the tech support section of the ptc web site, and by going through the help files in Pro, and have found nothing helpful at...
  2. Tmoore

    SS 440C

    To israelkk: We had the shaft analyzed at a lab, and they said it was a ductile fracture due to overloading. My problem right now, it that our shaft is undergoing bending and twisting, and I am having a little trouble bring the two together to figure out to what torque I should limit this shaft...
  3. Tmoore

    SS 440C

    Ok...I can admit when I am stumped...and I am stumped...I am not sure how to to this analysis considering dynamic loading. Right now, I am using the maximum torque from the gear box, and then using the torsion formulas from my old Solid Mechanics notes. So I have: (Torque)/(Second moment of...
  4. Tmoore

    SS 440C

    The shaft is loaded while turning. We have actually had on brittle fracture failure, and the machine while being tested this week appears to have failed again, however we will not know until the machine is taken apart this afternoon. We are changing shaft materials from SS 440 C to PH 17-4...
  5. Tmoore

    SS 440C

    This part is a shaft that is being driven by a gear box-servo motor combination, and it is made of SS 440C with between 52-54 Rc. We originally wanted to make this shaft from SS 440F but that was not available, so then we asked for SS 440C with 60 +/- 1 Rc, but the supplier gave us what I...
  6. Tmoore

    SS 440C

    Does anyone have the shear yield strenght of stainless steel 440 C? If anyone does it would be very helpful. Many thanks, Tom
  7. Tmoore

    Help

    The material is 304 stainless steel. This hole is drilled into the bottom left hand corner of a rectangular part, and this part is 15"x 24" x 6". Just to clarify, this is a sand cast part, and the hole is not completely drilled, it is just ground to a finish after casting to the...
  8. Tmoore

    Help

    Hi everyone, I have a part that was manufactured improperly, and I need to fix it as quickly as possible. Basically, we had a through drilled through our part that was 1.875" in diameter, and then a from the center of this part out in two directions, the hole was enlarged to 1.90&quot...
  9. Tmoore

    I was wondering if anyone could pos

    I was wondering if anyone could possible suggest a good supplier in the area of toronto/kitchener/waterloo region who could make a 16 mirror finish on several parts I am designing. Also I was wondering if anyone knows a way I could manufacture a part with this surface finish myself, and...
  10. Tmoore

    Two shafts assembled with glue

    Does anyone have any comments with regards to using one shaft instead of two? To be totally honest, I don't want to put my trust in loctite. These two parts, should they fail for any reason (ie. the loctite fail), would take several hours to replace. I do not see how the single shaft could...
  11. Tmoore

    Two shafts assembled with glue

    Hi prex, I am actually not in charge of the design, only in charge of the calculations. My boss feels that using all three of these methods of attaching the shafts is best, I am just trying to make sure it will work. I was wondering, in the equation you sent me, what does n represent? Thanks...
  12. Tmoore

    Two shafts assembled with glue

    Thanks guys. I was feeling very discouraged that I could not figure this problem out, but it is encouraging to find that it is as difficult as I first thought. I have very little information that helps me. I do have the torque that the motor supplies, it is 40 N-m. Then, because of the gear...
  13. Tmoore

    Two shafts assembled with glue

    Does anyone know how to calculate the following. I am going to be assembling two shafts together using a shrink fit, coating the interior of the two shafts with loctite, then welding the mating point of the two shafts with a fillet weld. The outer shaft will be attached at the bottom to a gear...
  14. Tmoore

    Friction Coefficient - steel on hardened steel

    Where did you find this value? The Marks handbook lists hard steel on hard steel as .78 and mild steel on mild steel as 0.74.
  15. Tmoore

    Friction Coefficient - steel on hardened steel

    I was wondering if someone could give me an approximate value for the coefficient of friction between two steel parts rubbing against each other. The first steel part is made of SAE 4140 and is not treated. The second steel part is made of hardened steel. If anyone has a value or knows where...
  16. Tmoore

    Sleeve Bearings

    I see that now, I was much too tired last night and now I have a better understanding of what you meant with your equation, I had skipped over the part that said the L/D ratio had to be bigger than the formula you gave me. I do have a value in mind for D, it is currently about 2.93". I do...
  17. Tmoore

    Sleeve Bearings

    Ok, I understand that you want me to find the L/D ratio, but I don't understand what value I am aiming for. For instance, I don't understand what is an acceptable value for L/D for this application. Lets say I get an L/D ratio of 1, I don't know if it is good enough for this application, or if...
  18. Tmoore

    Sleeve Bearings

    I think that is something I need to know, I am new at designing sleeve bearings, and I did not study them at all in school, and all I have is my machinists handbook :) The load is most definitely a side load, imagine if you will, the game hang man, I basically have the gallow (where the man is...
  19. Tmoore

    Sleeve Bearings

    I am just wondering how much side load a sleeve bearing in this arrangement can handle safely, and how you would go about finding out the maximum load the shaft can handle when extending before it will stick and not move in and out of the bearing smoothly. Thanks
  20. Tmoore

    Sleeve Bearings

    Can anyone help me with the design of a sleeve bearing, I am currently trying to understand how much side load I can have on my sleeve bearings. Does anyone know if there is any rule of thumb with regards to how long you should make your sleeve bearing based on the side load. To help you answer...

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