Involute Curves

[NEALROSENBLUM]

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>

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[ctorres2]

One time in the past I downloaded a model from a stock gear supplier with the correct pitch diameter etc.

It had all the gear teeth modeled perfectly.

[ptc-131571]

Neal,

I followed the attached guidelines from a presentation at a previous
Pro/User World Event.

(See attached file: Gears_and_Splines.pdf)

Gordon Caha, CMfgE
Mfg. Engineering
Complex Machining & Assembly
Solar Turbines Inc.
Phone 619 544-2329





Neal Rosenblum
<neal@geometrixen <br="/> g.com> To
-
01/20/2011 12:24 cc
PM
Subject
[proecad] - Involute Curves
Please respond to
Neal Rosenblum
<neal@geometrixen <br="/> g.com>

[NEALROSENBLUM]

I recently downloaded a Pro|E gear from SDP/SI. I called to ask a couple of
questions and the tech that I spoke with stated that their equations are
prone to errors, etc. It was almost as if he was telling me not to use
their Pro|E models.





Sincerely,

Neal Rosenblum

Geometrix Engineering, Inc.

201 N. 13th Avenue

Hollywood, FL 33019

[ksauter]

I don't know if it still exists, but I downloaded some gears from Stock
Drive Products years ago and they were native proe models with
everything in them needed to make whatever gear I wanted. I suspect
they have limited the information they share by now, but you might try them.

Ken Sauter

[anagnost]

have a look at:

[bkurth]

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.

-----

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>

[bkurth]

Just a note to all of you that get emails...I posted the wrong file, initially, but I have updated the file on the forum post. Sorry for any confusion.

Thanks...Brian