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  1. noobita

    AGMA surface endurance strength and AGMA bending strength

    According to calculations, i would need a material with a bending strength of 50kpsi+, that is even possible? Exists any material like this (hardened of course - i know nitrided, like 4140 have 42kpsi - and this is for maximum continous, not even stall, at stall i would need 4x10^8, what seems...
  2. noobita

    AGMA surface endurance strength and AGMA bending strength

    Let me see if i understood what you said. Imagine i do calculations for a specific diametral pitch, face width, profile shift, etc...it gives me an value of 20kpsi (this is only for the maximum continous torque). Then, i multiply by the cycles factor and the Safety factor, which you said i...
  3. noobita

    AGMA surface endurance strength and AGMA bending strength

    Thanks again israelkk and tbuelna. Responding first to israelkk, yeah, i know all the formulas are based in proper oiled systems. tbuelna, that's why i'm asking here, don't know if it is asking too much, help on finding suitable materials. I already posted all the system design, i can post...
  4. noobita

    AGMA surface endurance strength and AGMA bending strength

    Hi israelkk, once again thanks for your help. The sdp can make the profile shift of the gears by request (from what i read from their website), but at this stage the gears would be custom made. Could you tell me what program did you used (this because i searched online for a lot of programs and...
  5. noobita

    AGMA surface endurance strength and AGMA bending strength

    First of all, thanks again. DO you know if eng-tips has private message? Since would do this proccess much easier. @israelkk, modifying what i posted about the gears: (13/54) -> 80dp, face width(F) 2.5mm (0.1inches), x1=0.34 (pinion), x2=-0.34 (gear) (15/53) -> 80dp, F 3mm (0.12inches)...
  6. noobita

    AGMA surface endurance strength and AGMA bending strength

    Thanks for your answer israelkk, i was looking already for custom spur gear, the suppliear gave me the fallowing materials (the ones they use): 1) Carbon Steel SC45 (1045) 40Cr 2) Alloy Steel 42CrMo (SAE 4140, SCM 440) 20CrNiMo (AISI 8620) 40CrNiMo (SAE 4340) 20CrMnTi (This is most used for...
  7. noobita

    AGMA surface endurance strength and AGMA bending strength

    So,the maximum torque that the gearbox will have to output will be 5.0Nm(approximately 780 oz-in). Multiple rotations, without limits. Against the maximum torque, since it must handle 10^8 cycles in maximum continous torque, it should handle at least 10^4 cycles at the stall torque (which is the...
  8. noobita

    AGMA surface endurance strength and AGMA bending strength

    tbuelna first of all thanks for your reply, again. And sorry for the misunderstand, the system with 80DP is the first stage of gearbox, the one i talk in this last point is last stage (gearbox is composed by 5 stages), which has 48DP (and values presented for stresses are bidirectional values -...
  9. noobita

    AGMA surface endurance strength and AGMA bending strength

    Hi tbuelna, again, thanks for your reply, but again this file couldn't clear my doubts(it doesn't have the contact stress for 2024-t4). But from i read from the file, they say that gear designers are based in experience, this is, making the system and testing them, i think that i will try it...
  10. noobita

    AGMA surface endurance strength and AGMA bending strength

    Thanks tbuelna, i'll try to find that equation...Will reply as soon as i make the calculations. Best regards EDIT After searching around, i couldn't find the equation, could you please point it to me or post it here (this was better if forum had private messages, since you are only one...
  11. noobita

    AGMA surface endurance strength and AGMA bending strength

    Thanks again tbuelna, but again, the values showned here are for the ultimate strength and yield strength. Maybe i didn't understood the values from the book. For example, (this will be kind of a newbie question) agma gives this equation, based on hardness, for grade 1 steel: <<Contact-fatigue...
  12. noobita

    AGMA surface endurance strength and AGMA bending strength

    Hi, tbuelna, just saw the MIL-HDBK-5 but i coulnd't find what i'm looking for (used ctrl+f and searched for 2024), only could found the ultimate and yield strength, not the allowable contact strength and allowable bending strength. Best regards
  13. noobita

    AGMA surface endurance strength and AGMA bending strength

    Both power and motion, but are small values (~0.03 hp). From matweb, they seem to have a yield and ultimate strength close to other steel metals (hardened ones). Also, it is in shingley's mechanical engineering design book has a good material for gears. Best regards
  14. noobita

    AGMA surface endurance strength and AGMA bending strength

    Thanks for your reply CoryPad. That was what i was seing, that's why i came to the forum to know if anyone knows this values. About this materials being poor gear materials, they are not, it depends on your application. For example, sdp-si (www.sdp-si.com), a big gear's manufacturer, uses 303...
  15. noobita

    AGMA surface endurance strength and AGMA bending strength

    Does anyone knows how to calculate the AGMA surface endurance strength and the AGMA bending strength? I'm looking for a general formula (if there is, the ones i know are for steel), if there is? If not, does anyone knows these values for aluminum 2024-t4 and 303 stainless steel ( i need these...
  16. noobita

    Spur Gear - addedum modification/profile shift coefficient

    Thanks for your answer tbuelna, i'll see it and then post if i have any doubt :D
  17. noobita

    Spur Gear - addedum modification/profile shift coefficient

    Thanks for your reply tbuelna, math isn't a problema for me....could you point me out where i can find those docs? I'm not being able to find them at agma.org (already had searched for agma 207.07)...
  18. noobita

    Spur Gear - addedum modification/profile shift coefficient

    Dear israelkk, from what you said, "I always used calculations, analysis, dimensioning, tolerancing, defining surface and heat treatments", I'm a little confused. In my opinion, calculations, analysis are theorical....not practical...since when math is a practical discipline? Physical Education...
  19. noobita

    Spur Gear - addedum modification/profile shift coefficient

    Thanks for your reply tbuelna. I need this number of teeths to keep my system small...Could you point out where i can find the formulas to calculate the coeficiente based on those parameters (improve sliding and teeth life)? From the books i read, the only formula i could find was the one i...
  20. noobita

    Spur Gear - addedum modification/profile shift coefficient

    Hi all, If this is a repeated post, i'm sorry, but from my searches here in the fórum i couldn't find na answer to my doubt. Just joined the forum (I'm an electrical engineer, so i don't have much experience in mechanical design) and the reason was because after reading more than 5 books about...

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