trouble joining arc via polyline edit

[peb]

I need to revolve a polyline with a profile that includes an arc segment.
First I have to join all the segments, including the arc.

Via Polyline Edit command, the program refuses to recognize the arc as a polyline.

Even the Help says that it should allow me to turn that segment into a PL. But it keeps saying
Object selected is not a polyline

PEDITACCEPT command makes no difference either.

ACAD 2006

[Wanderer]

I need to revolve a polyline with a profile that includes an arc segment.
First I have to join all the segments, including the arc.

Via Polyline Edit command, the program refuses to recognize the arc as a polyline.

Even the Help says that it should allow me to turn that segment into a PL. But it keeps saying
Object selected is not a polyline

PEDITACCEPT command makes no difference either.

ACAD 2006

~shrug~ I don't know what might be wrong with that. I just drew an arc, pedit and it turned it into a pline.

could you post a file with the rogue arc and upload here so we can take a look at it?

[peb]

Sorry, I neglected to say that the arc was actually a quadrant from an ellipse.

That may be the kicker.

I've spent a lot of time on this. The only success I had was making a closed polyline whereby the arc was a true constant radius, and the other two segments were perpendicular lines. Then I could revolve that polyline.

THEN I had to draw the other, primary polyline shape, and revolve that.

Finally, I had to subtract the first shape from the second, and I finally ended up with the desired solid.

Surely there must be an easier way!

Also, I wish ACAD allowed the Z axis the same status and respect as X and Y.

[scott.wilcox]

You could try using the BOUNDARY command to create a polyline.

Scott

[jaberwok]

Set the sys var Pellipse to 1/On then recreate the elliptical quadrant.

[aledtaylor79401]

You do not need to join all the lines together to make a closed polyline.

Make sure all the lines meet exactly at their ends.

Use the 'region' command and select all the elements in your closed shape.

Revolve the region.

Aled Taylor
Design Engineer