Pinion Gear Quary: Breakage, Overcoming & Tolerance Stack Up

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Discussion Overview

The discussion revolves around the causes of pinion gear breakage, potential solutions, and considerations for tolerance stack-up in gear design. It includes inquiries about material properties, manufacturing methods such as investment casting, and specific gear dimensions and specifications.

Discussion Character

  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant inquires about the reasons for pinion breakage and asks for parameters to consider in overcoming the problem, including the feasibility of investment casting.
  • Another participant suggests that common causes of gear failure may include unexpected impact loads, misalignment, improperly set lash, and factory defects, while also noting the potential for foreign objects causing issues.
  • Several participants express frustration over the lack of context provided in the initial post, arguing that without understanding the loading conditions and service type, it is impossible to assess the tolerance stack-ups or diagnose the problem accurately.
  • One participant emphasizes that the pinion's breakage is likely due to improper handling or design, criticizing the insufficient information given for a proper analysis.
  • A link to a resource for gear components is shared, which some participants find useful.

Areas of Agreement / Disagreement

Participants generally disagree on the adequacy of the information provided to diagnose the issue. While some suggest potential causes for breakage, others criticize the lack of context and express skepticism about the ability to provide meaningful insights without further details.

Contextual Notes

The discussion highlights limitations in the information provided, including missing context about loading conditions, service types, and specific applications of the pinion gear, which are crucial for a thorough analysis.

dhananjaya
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The pinion gear is run by motor and is made of "FD-0205-50 per MPIF 35" material.
what could be the reason for pinion breakage.
How to overcome that problem and what are the parameters you need to consider.
Is it possible for investment casting gear.
what could be the possible tolerance stack up.

it's 14 teeth,DP=24, pressure angle=20 degree,AGMA quality Q7.
OD=0.6637-0.6667
Root diameter=0.4743-0.4773
STD pitch dia=0.5833
ADDEndum=0.0417
Whole depth,minimum=0.0938.

Thanks
 
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I'm afraid that I don't know what most of those abbreviations mean. The first culprits that I look for when a gear goes bad are unexpected impact loads, improperly set lash, misalignment with the mating gear, or simply a bad component (factory defect).

edit: Hmmm... forgot one: foreign objects.
 
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Are you serious? Are you mad? Just because you spout the gear data, you actually think anyone can glean an ounce of information as to how they are used? What the laoding is? What the service type is? How in the heck can we tell you what your tolerance stack ups are?

The obvious reason for pinion breakage is that you haven't a clue as to what you are doing.

If this is a problem posed to you in your job function, you are in a lot of trouble. I suggest you pick up any basic design of machine elements book and start reading.
 
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The pinion broke because you're doing something wrong with it. How on Earth we're supposed to figure out what, given the inadequate and largely superfluous information you've supplied is, as a professional engineer, beyond me.
 
http://www.emerson-ept.com/EPTRoot/Public/prod/main.asp

Check out what is readily available. Check out the components section.
 
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Thanks for that link, Ronnin. I've bookmarked it; looks right handy.
 
Danger said:
Thanks for that link, Ronnin. I've bookmarked it; looks right handy.

Your very welcome. I sell all of this neat stuff but never get to play with it.