circular duplication of sketch entities

Hello there,


I'm trying to build a gear under SW2008.
I built the volumic shape. Now, I'm trying to sketchup the profil of
for the tooth of the gear using the circular duplication, but it bugs.

I'm trying tp explain :
On the front face of a 3D disc, I design 2 circles, same center.
I make 2 vertical lines beginning on the inner circle and ending on
the outer circle.
Then, I have one teeth.

All my entities are "coincidents".

I need to have 10 tooth for my gear. I select my segments and I
duplicate them around my circles.
Copied lines are not "coincidents" anymore with circles !!!

Is it normal ?
Gill

 

in fact, in any case, I can't get intersection between lines and
cercles !!??? By intersection, I mean "one and only one point common
with the line and the circle"

Gill

 

Hi Bob,

file well received, thx ... exactly as I tried, you sketched up a
profil of your tooth and you extrude it through a 3D disc.
Well .. I didn't success to design the sketch... in fact to join some
lines with circles, excatly as you did with curves linked with you
inner circle and your outer circle.
In your case, without any junction between curves and circles, it's
impossible to cut the inner circle ...

Here below a picture :
http://gsicart.free.fr/PhotosPartage/gear_commented.JPG

 

what could be the best way to connect some entities like lines,
circles, curves ... in the same plan approximatively like in any CAD
system !!

AG

 

http://www.esoxrepublic.com/models/

There is a gear model. The current model is for a large gear, but it
is scalable.

 

I don't know how to scale a model .. neither to integer any profile
into my model ... my gear is not only a gear but a splined shaft (now
I've got the right english term for this !!).

It could be easier to explain to me how to connect some entities
(lines, circles ..) to build my own profil to be extruded.

Gill

 

By "scalable" I mean one could readily change the parameters (i.e.
pitch diameter, OD, # of teeth, pressure angle) to match what one
needs. Poor word choice on my part. There is no magic "scale" button
for this.