Make Helical Gears in Autocad?

[Ali.Khan]

I used AutoCad a long time ago and now i don't remember how to make helical gears. IF someone could please HELP me in this regard I would be really thankful.
I am using 2008 version. I would be grateful if you could show me step my step how this is done (with images if possible).

[Cad64]

The Tips'n'Tricks section is not the best place for asking questions. This is where we post tutoirals or tips on how to do things. Your question won't get much attention in here. I have moved you to the 3D Modeling section.

Check here for an answer: Helical gear as Solid.

I have merged this post into this thread since this same question was posted multiple times.

[Ali.Khan]

i am trying to make helical gear in 3D but i am struggling with the basics. I want to draw the teeth of the gear and then array it around the pitch circle. But that is all i know. If somebody could please show me the whole way, if possible with images i would be really grateful. All I know right now is that I need 17 teeth on a pinion to mesh with 62 teeth on a gear. PLEASE HELP ME. I read a mail earlier but it was not of much help to me.

[ReMark]

If you can draw a gear in 2D then obtaining a 3D model is just simply a matter of using the Extrude command. Your 2D representation should have the profile of the toothed gear with a hole in the center for the shaft. Extrude both the gear profile and the hole. Subtract the hole from the gear. Done.

You can also use the Region command. You would select both the gear profile and the hole and convert them to regions. Then subtract the hole from the gear profile. The final step would be to extrude the gear profile. Done.

If you PM me I'll send you a 2004 .dwg file of a simple 3D gear constructed via the method in the first paragraph above.

[GhostRider]

I don't know alot about gears, I'm sure there are mathimatical forumulas for working out the teeth width, pitch and diameters but I think your going to need the dimensions of the teeth and gear or you will have to work it out by the diameter of the gear. This is an example of a gear and it would be easy to model the gear with the dimensions. are you having trouble with the specifications of the gear, or the modeling itself?

[SLW210]

He said Helical Gears, what you have shown is for straight tooth gears.

Just draw the outline of the Helical Tooth and extrude it to the depth you need, then locate the tooth on the hub and polar array. I have three jobs going at once and do not have time for a tutorial with pics. Maybe later.

UPDATE:

On second thought, with 2008 you could sweep with a TWIST


He wants something like this.

[ReMark]

Ali.Khan:

Clarify for me, if you will, what the main problem is. Is it drawing a helical gear or is it the conversion to 3D or both? It kind of seems like it is both.

Any good mechanical drafting book would have an explanation on how to draw the gear (2D). You might even find instructions on how to do so online.

For converting it to 3D the tutorials at this site as well as at other sites should provide enough basic information for you to complete the task.

[ReMark]

Take a look at this link. I don't think it is actually AutoCAD the author is using but the steps would be the same. Just the names of the commands would vary.

http://www.prodesktop.net/helical%20gear/helical.htm

[Ali.Khan]

I basically have to start from scratch. Right from the first point of making a tooth. I know how to work out the polar array. if someone could please sow me how to make the first tooth. I would be grateful for the rest of my life.

Please remember I am talking about helical gears here.

[Ali.Khan]

I need the help in drawing the 2D and then talking it to 3D. But initially i have to draw it in 2D. First things first. HOW TO DRAW A SINGLE TOOTH?