All,
I am trying to create involute curves for a spur gear. I have found a couple of approximate methods...some seem better than others. All seem to be quite cryptic, even with my mechanical engineering handbook wide open.
Does anybody have a parametric gear model that they would be willing to share? Or at lease provide the parameters, relations, etc?
Thank you.
Sincerely,
Neal Rosenblum
Geometrix Engineering, Inc.
201 N. 13th Avenue
Hollywood, FL 33019
Ph: 954-920-2049
Fax: 954-920-9574
Cell: 954-649-9399
<u>neal@geometrixeng.c</u>
Neal,
Attached is a document one of our engineers created that we use to create spline curves from equations. It works quite well, and is very accurate. The only part that is questionable, is the root geometry. Depending on your manufacturing methods, the accuracy of the modeled root geometry can vary. You will need to decide what you use based on your methods and needs.
The attached document has the equations for both internal, and external involute spline curves. You just need to replace the data in the document with the appropriate data from the tables for the involute curve you are using.
Here are basic Pro/E instructions on how to create the curves using the equations.
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To create Involute Splines from Equation:
1. Insert Datum Coordinate System at start of splines
2. Create Datum Curve from Equation
- Select New CSYS
- Cartesian
- Paste Data from File (Update data to match current spline)
- Save & Exit
3. Repeat Step 2 for second curve
4. Use Edge and Select new curves
5. Create Construction Circle from Center of Part to just beyond spline root.
6. Create three point arc Tan, Tan, Tan to Spline, Spline, Const. Circle.
7. Create three point arc from Center of Part, Tan, Tan to Spline, Spline
8. Trim and Accept
-----
Hope this helps...Brian
In Reply to Neal Rosenblum:
All,
I am trying to create involute curves for a spur gear. I have found a couple of approximate methods...some seem better than others. All seem to be quite cryptic, even with my mechanical engineering handbook wide open.
Does anybody have a parametric gear model that they would be willing to share? Or at lease provide the parameters, relations, etc?
Thank you.
Sincerely,
Neal Rosenblum
Geometrix Engineering, Inc.
201 N. 13th Avenue
Hollywood, FL 33019
Ph: 954-920-2049
Fax: 954-920-9574
Cell: 954-649-9399
<u>neal@geometrixeng.c</u>