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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

Reply to
gil.sicart
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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

Reply to
gil.sicart

I just sent you my version of a spur gear. I also have one for meshed bevel gears.

Bob

Reply to
<castlebravo242

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 :

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Reply to
gil.sicart

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

Reply to
gil.sicart

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

Reply to
That70sTick

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

Reply to
gil.sicart

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.

Reply to
That70sTick

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