spur gears
spur gears
(OP)
How do I draw spure gears in Inventor professional 8.
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RE: spur gears
Post question in appropriate forum. (forum790)
Step 2:
Draw spure gears following the instructions in replies posted there.
RE: spur gears
"Art without engineering is dreaming; Engineering without art is calculating."
Steven K. Roberts, Technomad
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RE: spur gears
The method is independent of your software. You can take this for the tip for today.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: spur gears
RE: spur gears
These are covered in various elementry drafting textbooks. I can suggest, for example, Engineering Design Graphics, James H. Earle, 4th Edition, ISBN 0-201-11318-X. In this regard, Chapter 18 discusses the design and drawing of involute gears complete with necessary computations, while providing the support mathematics for the mechanics.
There are other design manuals, but I would suggest an engineering textbook from elementry drafting courses. These references provide the necessary detail and support documentation in a much more complete manner than what a website forum would provide. Good luck with it.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: spur gears
I approach this in the same manner except I start with the o.d. of the gear and profile the area between the teeth and do an extrude cut. You wind up with the same thing. Just another way to skin a cat.
Dennis
SolidWorks 2006 SP4.1
Windows XP Pro, Pentium4 3.00GHz
1.5 GB RAM, Matrox P650
Logitech Marble Mouse, CadMan
RE: spur gears
to draw the involute. I believe Geargen can output the shape as a wireframe in dxf format, which can be imported into most 3D modelers and then extruded to create a 3D gear model.
RE: spur gears
The Geargen program indeed produces a true shape of the gear. Actually in many posts I recommended this program. However, if you want an exact gear dimension let say up to 0.001mm or even 0.01mm which are practical for the common AGMA 10 accuracy. Then you end up with hundred of thousands or even millions of data points. From my experience both Solidworks and Alibre design which I tested can not handle extruded files from such 2D sketches. They are too heavy and slowing the system up to the point that there is no point to work with those parts. By the way few years ago I reported Solidworks through their branch in my country and sent them examples but to my best knowledge they did not solve this issue. My Alibre Design Professional too choke on such models.
Basically I do not see the reason for accurately make a solid model of a gear shape. You do not manufacture a gear from the solid part on a CNC machine. The manufacturing process is usually made by a hob or fellow etc. Therefore, the manufacturing drawing is a common 2D drawing.
If one intend to use wire EDM or laser cut to cut the teeth (which is expensive and not so accurate) then the 2D dxf is enough.
The only point that I see to use "so called accurate" solid modeling of a gear is for FEA dynamic analysis but then how do you account for the imperfection and inaccuracy of the tooth shape and profile, contact problems, establishing how many teeth are in actual contact, etc.
It seems to me that designers and drafter are investing unnecessarily too much time and effort to create kind of exact modeling of gears because the solid modeling program allows them to do this but, to my opinion it is like trying to kill a mosquito with a cannon.
True it is nice for presentation but the managers or customers do not see how accurate the gear is.
RE: spur gears
Politically speaking, JCBM wanted to understand the process involved with 3D spur gear sketching. Perhaps he is new to the technology, perhaps he is Junior. I strongly commend his efforts and those of others who choose continous education to advance the technology.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: spur gears
Politically speaking, JCBM wanted to understand the process involved with 3D spur gear sketching. Perhaps he is new to the technology, perhaps he is Junior. I strongly commend his efforts and those of others who choose continous education to advance the technology.
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: spur gears
For large numbers of teeth, you might as well model the tooth sides straight.
I understand that gears have been manufactured by powder metallurgy, without subsequent machining. Definitely, they are injection moulded from platic. This is another application for accurate geometry.
JHG
RE: spur gears
While a cool-looking mockup of the complete machine that can be viewed from all angles and lightings might be fun to model and thrill the marketing department, it isn't of much use to the machinists, welders and mechanics that have to actually produce the machine.
Shop drawing quality is at an all-time low right now. I've never seen such poor drawings as those produced these days. I blame programs that automatically produce orthographic projections and dimensions. More time should be spent on the art of producing a crisp, clean part drawing that includes all the appropriate information and is easy to read without becoming a cluttered mass of chaotic dimensions and unnecessary hidden lines in an unreadable black morass.
...there, I said it.
Don
Kansas City
RE: spur gears
preach on, brother, preach on.......star for you
ZCP
www.phoenix-engineer.com
RE: spur gears
Well said!!
RE: spur gears
http://www.profilesmagazine.com/p33/marsalek.html
Remember, I'm pointing to this for the mathematical explanation. I know you are using Inventor and this is a Pro/E solution.