Rick Rowlands,
Not to rain on your parade, but further to Forrest's post:
Spiral bevel blanks have different face & root angles than straight or Zerol bevel gears.
As For the calc's it's called a "machine summary" this has to be done first before the drawing change, because this is where the numbers come from.
The straight gear cutters are relatively simple compared to Zerol & spiral cutters.
Three Diametral Pitch cutters are probably going to be 12.00" Diameter heads so, if the gear shop has the cutter heads (about $8,000.00 each 's) the blade and shim sets, one for the gear & two sets for the pinion say $6,000.00 a set, used to be 12 weeks delivery, You are all ready into a big number.
Machine tooling, nose arbor for each part both for the cutting machine and the test machine, these are some moderately big parts so the arbors are going to be big too, cutting machine needs custom draw rods for the hydraulic chucking system on "Gleason" machines.
Now you go to heat treat and you hope the gear house engineer has enough experience to accurately guesstimate how the spiral is going to unwind, so that your gears finish up with the correct contact pattern. Drwg difficult to read, is that Rc 30? If so I would have rough blanked, NQ&T to Rc 30, finished machined & then finished cut the gear teeth.
I had many one off quotes & did not see the customer proceed, some that did I ground the parts from the solid, takes a while grinding, but you did save overall for one or two parts versus the cutter cost, you still have arbor costs, also gear house will probably need at least one set of parts for setup & development, usually do not need for straights.
I wish you well in your endeavor,
Les H.
Goto Kexin to know more.
Thread starter
Jarfi
Start date
Nov 11,Tags
In summary, the conversation discusses the differences between spiral bevel gears and normal bevel gears. While the spiral version is more popular in engineering, it is also more complex and prone to failure. However, with today's technology, manufacturing a spiral bevel gear is no more difficult than a normal one. The advantages of helical gears over spur gears are also mentioned, including less stress and the ability to use weaker bearings. The cost effectiveness of spur gears for small businesses and the preference for off-the-shelf parts are also discussed.
Jarfi
So I've been searching up "bevel gear" CAD tutorials, but all I can find is "Spiral bevel gear".
It seems like the spiral version of the bevel gear is much more popular in engineering then the normal one one.
But drawing a spiral bevel gear, and manufacturing it would be more complex and prone to faliure, while a normal bevel gear needs less detail. The spiral one seems to do the exact same thing except that it's more complex...
For a gear that needs to be responsive and simple, and can be 3d printed for pototyping, is there any reason why I would choose a spiral bevel gear over a normal type bevel gear?
Thanks in advance
Science Advisor
Are you aware of the advantages of helical gears over spur gears?
Wikipedia explains is pretty well.
Science Advisor
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See; http://en.wikipedia.org/wiki/Gleason_Corporation &#;After engineers at Packard developed spiral bevel gears, Gleason pioneered the machine tools to mass-produce them (with automotive differentials being the primary market)&#;.With today&#;s machines, it is no more difficult to generate a spiral bevel than a straight bevel gear.See also; http://www.cad.sun.ac.za/catalogs/MachineComponents/bevellgear.pdf
Jarfi
billy_joule said:
Baluncore said:
&#;After engineers at Packard developed spiral bevel gears, Gleason pioneered the machine tools to mass-produce them (with automotive differentials being the primary market)&#;.
With today&#;s machines, it is no more difficult to generate a spiral bevel than a straight bevel gear.
See also; http://www.cad.sun.ac.za/catalogs/MachineComponents/bevellgear.pdfSee; http://en.wikipedia.org/wiki/Gleason_Corporation &#;After engineers at Packard developed spiral bevel gears, Gleason pioneered the machine tools to mass-produce them (with automotive differentials being the primary market)&#;.With today&#;s machines, it is no more difficult to generate a spiral bevel than a straight bevel gear.See also; http://www.cad.sun.ac.za/catalogs/MachineComponents/bevellgear.pdf
I have touched upon it now, seems like Helical gears aren't completely superior with them having more torque on the gear shaft, which is why spur gears seem to be superior in chosen situations, mainly racing cars and high torque situations.That is sobering to see, yes I had a feeling they were more complex to manufacture, but seems like technology always wins.Although I suspect the cost effectiveness of spur gears still stands for small business owners that don't have access to a mechanical engineering team with money for mass production lines. Making a customized helical gear(fitting certain dimensions) would thus perhaps still be less cost effective, since spur gears are more expensive to make until at the level of a massive corporation.Thanks for the information,-Jarfi
Science Advisor
Jarfi said:
In most cases it's much more common to design to suit off the shelve parts (including gears) than try to make everything in house. I'd guess even a company like Toyota don't make their own gears - Gear companies have the plant and have done the R&D already.
That is not true. Helical have more teeth meshing so less stress for a given torque. Straight cut gears are preferred for some situations because they have no thrust force. That means cases and bearings can be weaker and lighter but the gears will have to be a bit larger than the equivalent helical gears.In most cases it's much more common to design to suit off the shelve parts (including gears) than try to make everything in house. I'd guess even a company like Toyota don't make their own gears - Gear companies have the plant and have done the R&D already.
A bevel gear is a type of gear with a cone-shaped surface that is used to transmit power between intersecting shafts. It has straight teeth that are cut along the surface of the cone. A spiral bevel gear, on the other hand, has curved teeth that are cut in a spiral pattern along the surface of the cone. This design allows for smoother and more efficient power transmission.
One of the main advantages of a spiral bevel gear is its ability to handle higher loads and torque. The curved teeth provide more surface area for contact, allowing for a larger load-carrying capacity. Additionally, the spiral design reduces noise and vibration, making it ideal for high-speed and high-precision applications.
No, bevel gears and spiral bevel gears are not interchangeable. The difference in tooth design and surface contact means that they cannot mesh properly and will not function correctly if used interchangeably. It is important to select the appropriate gear type for the specific application.
When selecting between these two gear types, factors such as load, speed, precision, noise level, and application requirements should be taken into consideration. Spiral bevel gears are typically more expensive and require more precise manufacturing, so they are usually reserved for high-performance applications where noise and vibration must be minimized.
Bevel gears and spiral bevel gears are commonly used in a variety of industrial applications that involve intersecting shafts. They are often found in power transmission systems, such as in automobiles, construction equipment, and heavy machinery. They are also used in precision instruments, such as aircraft engines and medical equipment.
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