PC Applications in Parallel Axis Gear System Design and Analysis
Gain an understanding of parallel axis gear design, and learn to use the software tool, PowerGear, to analyze the main parameters involved. (A student version of the software is included in the price of the course.) Cover the basics of gear load capacity evaluation from a theoretical viewpoint, and use the PC as a tool to apply these theoretical concepts.
Raymond J. Drago is Chief Engineer for Drive Systems Technology, Inc., a mechanical power transmission consulting organization that he founded in 1976. Drago holds a master’s degree in structural engineering from Drexel University (1980), a master’s degree in engineering from ... read more
Benefits and Learning Outcomes
- Understand durability (surface fatigue & wear), strength (tooth fracture) and scoring
- Discuss typical sets of problematical design parameters from your current work assignments
- Experience hands-on design perspective through group projects
Course Objective – The purpose of this seminar is to provide an understanding of parallel axis gear design and demonstrate the use of a software tool to analyze the main parameters involved. A new Computer Program, PowerGear (which includes the DrawGear animated graphics module), will be used in the seminar and each student will receive a CD containing a student version of the software as part of the course materials. The seminar will cover the basics of both gear load capacity evaluation from a theoretical viewpoint and the use of the Personal Computer as a tool to apply the theoretical concepts.
About this Course – In order to design a gear set for a specific purpose the following load capacity considerations will be studied – durability (surface fatigue & wear); strength (tooth fracture); & scoring. We encourage you to bring typical sets of problematical design parameters from your current work assignments. While PowerGear is an integral part of the seminar, the main emphasis is on understanding the design of gearing and the use of PowerGear as a tool rather than a tutorial on the use of program alone.
Who Should Attend – The seminar is aimed primarily at engineers and others who specify, use, or design gears or gear drives. Others, such as process and systems engineers, will also find the seminar useful since gears and gear drives form an integral, often neglected part of most industrial equipment. For the novice some basic gear knowledge is required but an extensive background is not necessary since PowerGear is very easy to use and DrawGear illustrates fundamental concepts. For the advanced gear designer, PowerGear is an extremely powerful new tool and can be mastered quickly. It provides everything required; from capacity analysis through geometric optimization, to the definition of complete manufacturing data, including the definition of the basic hob used to produce a specified tooth form.
PowerGear (which includes the DrawGear animated graphics module with ‘elucidator technology’) is an integrated, professional design and analysis tool for spur, single and double helical gears of either external or internal configuration. With a single easy-to-use, fully prompted input sequence, the program will calculate all required basic gear tooth geometry, including these parameters:
- Tooth and tool geometry.
- Profile and face contact ratios.
- Bending and contact stresses.
- Flash temperature.
- Strength & durability ratings in accordance with AGMA Standard 2001-D04.
- ElastoHydroDynamic (EHD) film thickness.
- Frictional (mechanical) power loss.
- Scoring hazard rating.
- Tooth profile kinematics (sliding, rolling, and linear velocities, slip ratio, specific sliding).
- Subsurface shear stress/strength with or without frictional loading considered.
- Required case depth (for surface hardened gears).
- Case depth profile shape required to prevent case crushing, pitting, and spalling failures.
- Data needed to prepare an engineering drawing of the gear, MFG data printout.
- DXF output files (with definable step size and file size).
- U.S. or metric units.
- Direct geometry or parametric analysis.
- Complete printouts, including graphs of critical temperature, slip ratio, tooth loading, specific film thickness, and subsurface shear stress distribution.
- Detailed comma separated variable (CSV) files, for additional analysis.
- Dynamic plotting capability to allow visualization of the gear set in mesh and to allow optimization while the dynamic gear set is in motion.
Input is extremely easy. Just fill in each screen in sequence. Input features include logically grouped input screens (just answer the questions), multiple data entry modes including fully parametric (let the computer calculate all geometry!), add virtually unlimited text notes to your data file to identify your thoughts and data, calculate AGMA power ratings or calculate stresses at given loading, or BOTH. A variety of data output methods and formats are available, including, conventional printed format (on any windows compliant printer) with analysis text notes, CSV data files which can to be read by other programs (e.g., word processors, spread sheets, etc.) for additional report and presentation preparation. PowerGear also provides a separate summary sheet showing all manufacturing data.
DrawGear is stand-alone gear drawing software with elucidator technology. Arrow keys coupled to input parameters allow tuning a gear set ‘live’, enabling greater understanding of what parameters do what. At this writing DrawGear cannot export data to PowerGear, however PowerGear can export data to DrawGear in a ‘drawing only’ mode.
In addition to the very powerful analysis capabilities provided by PowerGear, your data can be exported to DrawGear, the extremely powerful graphics utility that plots and animates the entire gear mesh. This feature allows the user to directly visualize the mesh action. Of even greater importance, however, the gear geometry is dynamically variable within the DrawGear module so that changes made to the gears are reflected immediately on the screen as the gears rotate. DrawGear also has the capability to export and Auto CAD DXF file of the complete gear mesh as shown here.
PC with Windows XP or Windows 7 (software will run on other MS Windows versions as well but best performance is obtained with the latest operating systems). After the seminar, when you first install PowerGear on your computer at home, you will have a 30-day fully functional trial of the Professional Version of the software. At the end of the 30-day period, you may enter your Student License (included in seminar fee) and continue to use the Student Version or you may purchase a Full Professional License at a special reduced price (20% discount from the usual $795.00 price).
Course Schedule (PC Applications seminar only – see below for other seminars):
Overview of PC Use in Gear Design & Interaction of the Design Process with the PC
10am-2pm Gear Analysis:
Standard (AGMA) Rating Practices and discussion of the theoretical basis of each rating practice, including Bending, Strength, Cantilever Beam Modified; Surface Durability, Surface Contact Stress Approach; Scoring Resistance Using Critical (“Flash”) Temperature Theory; Extensions to Standard Rating Practice, including sliding velocity and subsurface shear stress analyses
2-4pm Software Introduction & Instruction:
Instruction and demonstration of PowerGear & DrawGear Software
4-4:30pm Software Installation:
Class receives and installs individual CDs with PowerGear & DrawGear Software
8am-1pm Workshop Sessions:
Class works on design, analysis, and evaluation problems based on real world experience using PowerGear & DrawGear Software. Problems are all based on actual situations (modified to fit class format) and are progressive in difficulty from very simple one-parameter questions up to completely open-ended design situations.