What are the steps to draw a crown face gear?
What are the steps to draw a crown face gear?
(OP)
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
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





RE: What are the steps to draw a crown face gear?
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
RE: What are the steps to draw a crown face gear?