Two different offerings regarding you question. I'm not sure these will fill the request.
download the trial and look at section 6 ,7 and 19 will draw gears with dxf-output --lastest ver is 1.15
MITCalc - Spur Gear Calculation v1.14 Shareware Download ...
Geometric design and strength check of spur gear (straight and helical) ... MITCalc - Spur Gear Calculation. License Type: Shareware. Date Added: July 29, ...
www.filebuzz.com/fileinfo/13679/MITCalc___Spur_Gear_Calculation.html - 17k - Cached - Similar pages
Geometric design and strength check of spur gear with straight and helical toothing. Application is developed in MS
Excel, is multi-language and supports Imperial and Metric units and solves the following main tasks:
- Calculation of helical and straight toothing (external).
- Automatic design of a transmission with the minimum number of input requirements.
- Design for entered coefficients of safety (static, dynamic).
- Calculation of complete geometric parameters (including corrected toothing).
- Optimization of toothing by use of proper correction (balancing specific slips, miminizing specific slips, strength...).
- Calculation of strength parameters, safety check.
- Design of gearing for exact axis distance.
- Supplementary calculations (calculation of parameters of the existing gear, temperature rise, design of shafts,
check dimensions).
- Support of 2D and 3D CAD systems.
- Drawings of an accurate tooth shape including data (X,Y coordinates).
- Support of 2D CAD (AutoCAD, AutoCAD LT, IntelliCAD, Ashlar Graphite, TurboCAD) and 3D CAD in full
calculation package (Autodesk Inventor, SolidWorks, SolidEdge, Pro/E). The calculations use procedures,
algorithms and data from
standards ANSI, ISO, DIN, BS and specialized literature. Used standards: ISO 6336, ISO 1328, DIN 3990, ANSI
B6.1-1968, AGMA 2001-C95, AGMA 2001-D04, AGMA 908-B89/95 and others.This module is a part of MITCalc -
Mechanical and Technical Calculation Package for gear, belt and chain drives, springs, beam, shaft, bolt
connection, shaft connection, tolerances and many others
6.1 Number of teeth Pinion / Gear N 21 38
6.2 Face width (Pinion / Gear) F 5.6000 5.4300 [in]
6.3 Normal module mn 0.3333 [in]
6.4 Transverse module mt 0.3333 [in]
6.5 Diametral Pitch (normal) Pn 3.0000
6.6 Diametral Pitch (transverse) Pt 3.0000
6.7 Circular pitch pn 1.0472 [in]
6.8 Transverse circular pitch pt 1.0472 [in]
6.9 Base circular pitch pN 0.9840 [in]
6.10 Base circular pitch transverse pT 0.9840 [in]
6.11 Center distance (pitch) C 9.8333 [in]
6.12 Center distance (production) Cm 9.8333 [in]
6.13 Center distance (working) Cw 9.8333 [in]
6.14 Pressure angle F 20.0000 [°]
F
6.15 Transverse pressure angle t 20.0000 [°]
6.16 Pressure angle at the pitch cylinder F wn 20.0000 [°]
6.17 Transverse pressure angle at the pitch cylinder F wt 20.0000 [°]
6.18 Helix angle Y 0.0000 [°]
6.19 Base helix angle Y b 0.0000 [°]
6.20 Tip diameter DO 7.6667 13.3333 [in]
6.21 Reference diameter D 7.0000 12.6667 [in]
6.22 Base diameter DB 6.5778 11.9028 [in]
6.23 Root diameter DR 6.1667 11.8333 [in]
6.24 Operating pitch diameter DW 7.0000 12.6667 [in]
6.25 Addendum ha 0.3333 0.3333 [in]
6.26 Dedendum hf 0.4167 0.4167 [in]
6.27 Tooth thickness on the tip diameter tno 0.2336 0.2523 [in]
6.28 Tooth thickness on the tip diameter (transverse) tto 0.2336 0.2523 [in]
6.29 Tooth thickness on the pitch diameter tnc 0.5236 0.5236 [in]
6.30 Tooth thickness on the pitch diameter (transverse) ttc 0.5236 0.5236 [in]
6.31 Tooth thickness on the root diameter tr 0.5532 0.6655 [in]
6.32 Unit tooth thickness on the tip diameter to* 0.7007 0.7569 [modul (1/P)]
6.33 Unit correction dY 0.0000 [in]
6.34 Total unit correction x1+x2 0.0000 [modul (1/P)]
6.35 Addendum modification coefficient x 0.0000 0.0000 [in]
the following is a PDF---free
Using Spreadsheets to Parameterize Spur Gear Design for Laser ...
File Format: PDF/Adobe Acrobat - View as HTML
While many programs. exist to model non-linear surfaces, they do not work easily on the unusual design of a gear’s. tooth. Since spur gears are such a ...
http://stuff.mit.edu/people/jbf/thesis/thesis.pdfEnjoy the reading!!
__________
Jay