What are the steps to draw a crown face gear?

[petecul]

I have an application for a crown gear like those one :

http://www.zakgear.com/Scrown.html

I have tried to draw them on solidworks, I am using a normal spur gear with 10 teeth as a pinion and 80 teeth gear as a crown face gear.

To build the crowm, I use the theory behing a traditional rack, then a put all the teeth on a circular path to obtain a face crown gear. My problem is that I obtain interferance between the pinon and the crown. I have it on CAD if you are interested to see what I have tried to do.

I am using a 0.5 mm modulus pinion with 10 teeth and the crown, should be 4mm thick, 40 mm inside and 48 mm outsise.

It's a really a small gear set. I have figured out 80 teeth for the crown to match the pinion but I am not sure. The overall gear ratio is not important. If it's easier, I can do it with a bevel gear type. One of my criteria is the overall thickness, smaller is better!!

Thanks
Petecul

 

[EnglishMuffin]

Are you really making Wildhaber Novikov gears? (These are circular arc types, not involute, and very unusual). Note that they have misspelled "Wildhaber" on that site.
Regarding your problem, assuming you are talking about an involute face gear, when you say you used the theory behind a "rack" - note that you have to generate the profile. Unlike a straight piece of rack, the surface of the tooth on a face gear is not planar, but is a rather complicated surface, because the shape of the tooth varies as you move radially inwards. At any radial position, a transverse cross section does have a rack-like appearance, but the actual slope of the tooth flanks varies with radial position. You could try GearTrax - but I don't know if they have face gear capability.

http://www.camnetics.com/GearTrax.htm

 

[Gearhead]

Hi UTS has a Face Gear Module if you are willing to spend some money try

http://www.uts.com