Find Gear Sizes/Pitches for Designing a Gearbox

In summary: Just make sure to have the bearings checked for wear and tear before doing so.In summary, the conversation revolves around designing a gearbox for a class project. The person is looking for resources and recommendations for readily available gear sizes and pitches. The conversation also touches on the possibility of custom-making gears and the potential costs involved. The conversation also mentions different websites that offer gears, but with some drawbacks such as unwanted postcards. The conversation also briefly mentions the formula for calculating the distance between two gears on the same shaft and the use of programs for calculating gearbox speeds, dimensions, and selecting bearings. The conversation ends with a recommendation to seek advice from a professional engineer or the manufacturer of the lathe.
  • #1
Saladsamurai
3,020
7
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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  • #3
That's great start for me nvn. Thank you.
 
  • #4
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).
 
  • #5
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.
 
  • #6
There is also

http://www.rushgears.com/

Although, if you buy anything from them they will send you post card for the next decade.
 
  • #7
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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  • #8
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  • #9
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.
 

1. How do I determine the gear size and pitch for my gearbox design?

Determining the gear size and pitch for a gearbox design involves several calculations based on the desired gear ratio, number of teeth, and the application's torque and speed requirements. It is recommended to consult a gear design handbook or software for accurate calculations.

2. Can I use the same gear size and pitch for all gears in my gearbox?

It is generally not recommended to use the same gear size and pitch for all gears in a gearbox. Different gears may have different torque and speed requirements, and using the same gear size and pitch may result in poor performance or premature failure.

3. How do I know if the gear pitch I have chosen is suitable for my application?

The gear pitch is determined by the module, which is a measure of the size of the gear teeth. A higher module indicates larger, stronger teeth, while a lower module indicates smaller, more precise teeth. The suitability of the gear pitch depends on the application's torque and speed requirements, as well as the available space for the gearbox.

4. Is it better to use a smaller or larger gear pitch for my gearbox design?

The choice between a smaller or larger gear pitch depends on the specific application and its requirements. A smaller gear pitch can provide more precise and smoother motion, while a larger gear pitch can handle higher torque and is more durable. It is important to select the appropriate gear pitch based on the application's needs.

5. Can I use plastic gears for my gearbox design?

The use of plastic gears in a gearbox design depends on the specific application and its requirements. Plastic gears can be a cost-effective and lightweight option, but they may not be suitable for high torque or high-speed applications. It is recommended to consult a gear design specialist to determine if plastic gears are appropriate for your gearbox design.

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