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helical gear tooth profile, how do I get the right helix angle with coil tool?
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I have generated a gear set using inventor. Now I would like to 3d print the gears. I have uesd the export tooth shape to get the true tooth profile. now I am attempting to use the coil feature to generate the helical tooth. The problem im running into is in the coil tool I can only give it a Revolution and height dimension. The hight is the width of the gear, but I am having a problem converting the helix angle to the "Revolution" perameter. I have read other posts and they say that it is Helix angle / 360. I have tried that and then compared it to the original gear generated by inventor and it is not even close. I need to do this on in internal gear and match it to an external gear. I ahve attached the generated gears i'm working with.
Thanks for the help in advance! I really apreciate it!
Andrew
Re: helical gear tooth profile, how do I get the right helix angle with coil too
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So I have learned a little more trying to figure this out. In other examples people have been using the coil feature with the revolution and height setting. But what I have noticed is if you enter a number for revolution say thats close to the helix you want ( I have not figured out how to coil the correct helix angle yet) and then you change the height, it changes the helix angle. So I belive the correct method is to use the Pitch and height setting. Now I need to figure out how to calculate pitch based off of a helix angle. When you use pitch and height, then change the height it will just continue the same angle without distorting it.
If anyone want's to chime in and help me out it would be greatly appreciated! Thanks!
Andrew
Re: helical gear tooth profile, how do I get the right helix angle with coil too
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Although not an expert, I recently used this method and it worked very well.
1) Design the gears using the design accelerator.
2) Export the tooth profiles.
3) Create a Coil feature
a) Coil Shape
i) Select the tooth profile
ii) Select Z axis
iii) Choose "cut"
iv) Choose desired rotation
b) Coil Size
i) Type = Pitch and Revolution
ii) Pitch = PitchDiameter * PI / tan(HelixAngle)
iii) Revolution = FaceWidth * tan(HelixAngle) / ( PitchDiameter * PI )
4) Array the coil feature.
