involute gear drawing 1

[gearheadwannabe]

yes i am new to auto cad and engineering in general. I am updating drawings for a turboprop motot and have to draw some involute gears that were drawn in the 50's

i have internal splines that dont give the the base diameter and they want them drawn like a external spline. can anyone help me in finding a web site that will show exactly how to draw involute splines. Or is there anyone out there that can explain it if i give the number i have to you.

Ahead of time thanx to all of you out there.

 

[Steveeng]

Go to

http://www.hexagon.de/down_e.htm

and select the correct download for the type of spline you want.
The demo will allow you to draw a 25T spline only but once drawn you then have a standard to work to.

John S.

 

[Spurs]

Try this web site:

http://members.rogers.com/webgear/home.htm

 

[gearguru]

There are some Lisp programs which create the gears/involute splines. Try to search on the Web!
If you know the cutting/checking data for your splines (they have to be a part of the old drawing) then the rest is just some math and programming. I can create for you the 2D dxf file for such spline (without root fillets, you can add it easily), then you can extrude it to create 3D solid model. I do not use ACAD, I can not create dwg file. If you want it, tell us:

No. of teeth
Module ( or Diametral Pitch)
Pressure angle
Major dia
Root dia
your e-mail

 

[gearguru]

Sorry, I missed more parameters:
1. the tooth thicknes/space (circular) and the diameter where it is measured, or the size over/between pins

For helical gears I need also the helix angle, but this is not your case.

 

[midnight041]

Try this wesite,

Http://www.quickgear.com/iD9.html.

They
have free software downloads (40 day trial basis only), for both involute gears and splines. Hope it helps.

 

[midnight041]

Correction to last posting-go to

Http://quickgear.bizland.com

for the free download.

 

[chicopee]

I have drawn straight teeth spur gears and bevel gear w/ autocad 2000 in 2D and 3D; but then I had to rely on Mechanical Desktop to drawn the only spiral bevel gear in my life in 3D and that was a lot of work in which I had to use the rail command to curve a tooth and then polar array it to get the gear shape.

 

[Philrock]

Unless you are concerned with issues like tip to fillet interferences, there is little value to making an accurate drawing of a gear or spline. Common practice is to show the ootside and root diameters as phantom circles and the pitch diameter as a centerline circle. If you are drawing a splined shaft and your specifications are correct, you should not need to make an accutate drawing of the spline teeth.