Find Gear Sizes/Pitches for Designing a Gearbox

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    Designing Gear
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Discussion Overview

The discussion revolves around finding resources for gear sizes and pitches relevant to designing a gearbox, particularly in an educational context. Participants share various sources and address considerations for both off-the-shelf and custom gears, as well as related design parameters.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related
  • Debate/contested

Main Points Raised

  • Casey seeks a catalog of readily available gear sizes and pitches for a gearbox design project.
  • One participant suggests a specific website for gear resources.
  • Another participant emphasizes that gears can be custom cut to specifications, suggesting that off-the-shelf availability may not be a strict requirement for a classroom project.
  • However, Casey clarifies that their professor insists on using off-the-shelf gears.
  • Multiple participants provide additional websites for sourcing gears, noting potential issues with marketing materials from suppliers.
  • A participant mentions that custom gears may not be significantly more expensive when ordered in small quantities, challenging the necessity of off-the-shelf options.
  • Another participant inquires about the formula for the distance between two gears on the same shaft, leading to a clarification that placement depends on alignment with mating gears.
  • There are questions about programs for calculating gearbox specifications and standard deflections for shafts, with a caution against relying solely on software for engineering tasks.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of using off-the-shelf gears versus custom options, indicating a lack of consensus on this point. Additionally, there is no agreement on the best approach for calculating gearbox dimensions and specifications.

Contextual Notes

Participants mention various assumptions regarding the feasibility of custom gear production and the implications of design constraints set by academic requirements. There are also unresolved questions about specific calculations related to gearbox design.

Saladsamurai
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For one of my classes, I have to design a gearbox. i am currently going through some calculations, but before I get too far in, I would like to know where one can find a list/catalog of readily available gear sizes/pitches.

The gearbox clearly has to satisfy certain load carrying parameters, but it also has a size constraint, so I don't want to start with an 8" diameter pinion, if I can start with 2" (these are not actual numbers, just for example)

I need a good resource for gears and i am sure that somebody here know a nice one :smile:

Thanks,
Casey
 
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That's great start for me nvn. Thank you.
 
Bear in mind that gears can be cut to almost any spec. If this is simply a classroom design project that does not have to be built, you can specify anything that is buildable, whether you can buy it off the shelf or not. Gear cutting is available in almost every city in the US of any size at all, so don't be too concerned about this (one off may be more of a problem, however).
 
Dr.D said:
Bear in mind that gears can be cut to almost any spec. If this is simply a classroom design project that does not have to be built, you can specify anything that is buildable, whether you can buy it off the shelf or not. Gear cutting is available in almost every city in the US of any size at all, so don't be too concerned about this (one off may be more of a problem, however).

Well, my professor has been very adamant that this is a concern. I realize things can be special ordered, but his point his why bother?

So they do have to be off-the-shelf. Thank you though.
 
There is also

http://www.rushgears.com/

Although, if you buy anything from them they will send you post card for the next decade.
 
FredGarvin said:
There is also

http://www.rushgears.com/

Although, if you buy anything from them they will send you post card for the next decade.
And they don't even send Christmas ones or Easter ones. It's always the same card with a gear on it. booring... :(

Hey Salad. Try also http://www.mcmaster.com/#gears/=2bfnsw".

Oh, and Dr.D is right about just having one custom made - your prof's concern is overblown. They're not much more expensive if you're buying a dozen or so. Most of the cost for such things goes into set up charges, so once you buy one to pay for the set up charge, the rest are fairly inexpensive. I've spec'd out a half dozen different gears over the years and found very competitive pricing even for quantities as small as 5. The cost of 'off the shelf' has to be weighed against the fact that there's not a huge market for off the shelf gears so prices aren't that much less to simply have one made.
 
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The very best reference and source I have found is www.wmberg.com
 
  • #10
In the same point i design a gearbox but i didn't find formula for the distance between two gears on the same shaft
htanks
elrouby_mnm
 
  • #11
Two gears on the same shaft are where ever you choose to locate them, provided they do not overlap. The point is they have to be aligned with the gears they will mate with; that is what determines the planes they must be placed in.
 
  • #12
Thanks Dr.D
i got it
 
  • #13
Is there any program to calculate gearbox speeds, dimensions, gears and shafts dimentions and selecting bearing form input power ?
i need the gearbox for centerlathe

please. is there a standard allowed deflection for shafts ?? i need a source
 
  • #14
elrouby_mnm said:
Is there any program to calculate gearbox speeds, dimensions, gears and shafts dimentions and selecting bearing form input power ?
i need the gearbox for centerlathe

please. is there a standard allowed deflection for shafts ?? i need a source
If there is, I wouldn't trust it. Some of us get paid to do this stuff for a living. All of the questions you asked require real engineering work to be performed. I would recommend calling the manufacturer of the lathe and see what they recommend. If that is not an option, try retrofitting an existing gearbox from a similarly powered lathe.
 

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