Drawing gears

[sr20ser]

Let me start off by telling you why I write.
I have been a laser technician for a few years now, and have taken a shine to drawing items in auto CAD.

Well, the engineer here was fired and I was tossed into this position. I am starting to sink and need a ton of help.

My question is, " How do you draw a gear in AutoCAD 2000"?
Thanks,
-Tim

 

[Barry1961]

I start with a circles at the OD, bottom of tooth and pitch dia. Then draw one tooth in the correct position on the circle and then do the Array command. After in the array command box you will choose Polar Type. I draw the first tooth on the top of the circle. As far as the tooth profile goes..................

Barry1961

 

[knobhead]

If you want to draw an involute, you have to go back to the old manual drawing board techniques and develop it 'long hand' so to speak - there isn't a quick way (that I know of).

You might find someone somewhere has done a LISP routine to generate them quickly though..

I'm sure you know how to generate an involute, but just on the off chance you don't: imagine a piece of string wrapped around your diameter. Pull on the string to unwind it, keeping it taut - the end of the string will be following an involute shape. Just construct a series of points that the end of the string will pass through in autocad, and then join them all up with a spline.


Excessive accuaracy is a sign of poor breeding. -Socrates.

 

[WoodWorx]

Mastercam has a C hook that will draw the gears for you.

 

[plasgears]

Try contacting the Gears and Pulleys location in Mech Eng. It's important to draw the gear tooth right because manufacturing may lift the details off the CAD drawing and make parts according to this.

I have a story. I joined a company that had trouble with worm gear mismatch. The worm was not 90 deg to the gear axis. The error was about 10 deg. I found that the gear was drawn incorrectly, and the mfr made gears according to the drawing, not the published gear data. Add a note to the drawing:

(Critical sign) N. Gear tooth details shall be according to the gear data tabulation, not the drawing of the gear.

 

[Kenneth]

sr20ser:

I hope that you've found the AutoCad forum (forum555) at this site...