GEAR TIP RELIEF TANGENT
GEAR TIP RELIEF TANGENT
(OP)
I need to specify a proper way to dimension a tip relief on a gear. I want the arc I dimension to stay tangent to the involute. If I dimension the tip relief per the attached PDF this will not allow for the radius and the involute to be tangent? How does one specify that a radius needs to stay tangent to an involute segment?





RE: GEAR TIP RELIEF TANGENT
RE: GEAR TIP RELIEF TANGENT
RE: GEAR TIP RELIEF TANGENT
I'm assuming you have a computer-generated involute and your CAD won't find a perpendicular. If it will, then draw perpendiculars to the endpoints and show the arc centerpoint. By having an arc centered on a line perpendicular to the endpoint of a curve, that makes it tangent.
Or maybe just call it a fillet between the 2 involutes. That implies tangency, but then you are relying on the maker to get it accurate instead of fudging it.
How accurate does it need to be for plastic gear teeth?
RE: GEAR TIP RELIEF TANGENT
RE: GEAR TIP RELIEF TANGENT
Peter Truitt
Minnesota
RE: GEAR TIP RELIEF TANGENT
We do not want a ledge, sharp edge or any another type of flaw on these gear teeth. Thanks again for the feedback
RE: GEAR TIP RELIEF TANGENT
(The length of that line is the local radius of the curvature for your involute in the end point of the involute.)