CorBlimey, thanks again that worked.
I need advise on 'best practice' to form the duct. The duct at the cylinder end is split in two as per my prev. attachment, however this forms into a single duct as the duct progresses. As the section changes need to be precise I propose to sketch every few...
I've hit a snag. Although the wrap worked for leaving the top of the port flat, I now cannot do a lofted cut to make the duct using the wrapped outline. Is there a way of copying the outline onto a new sketch at the plane angle I'm using for the duct so I can make the cut but still leave the...
CorBlimeyLimey
Excellent! That's perfectly how I wanted it. Thanks
Now all I have to do is continue the cut with a varying section shape and merge the 2 ducts into a single. I'll have a play with what I have now and come back if I get stuck.
One other note. Having used Autocad paper model in...
... ahh, I've just dug out an actual production casting. Looking up the exhaust duct towards the cylinder it has a compound curve at the apex of the roof of the duct and the port in the cylinder wall to produce a straight top to the exhaust port. Oh dear!
How in world am I going to reproduce that?
OK I got you, but no, that puts an angle in the duct. Not what I'm after. The duct must be straight from the cylinder wall all the way to the outer casing. The only other way I can think of is to draw the sketch with a curve that equals the cylinder wall curve as produced by the current sketch...
Correct.
I don't know how to 'share' a sketch.
Looking at the image, it appears as I want it viewing at that angle. I see you've added a 'cut extrude' to the tree, need to examine how you did that. Possiblily best if you post your modified part
Thanks
Eltron
Nope thats the same.
I did try to draw a 3D sketch over the the weekend directly on the cylinder wall using the shadow of the wrap as a template.
I gave up as it was just too difficult and I dont think that would extrude cut anyhow.
While responses are gathered, here's another question.
The exhaust duct changes section shape as it proceeds. I think I know how to do this using a lofted cut with a profile. However the 2 duct merge into a single duct.
Do i have to add a sketch at the end of the lofted cut to continue the...
Eltron,
Yes normal to the sketch, the centre of the sketch is exactly on the cylinder wall axis (28 radius from the bore (and part) centre.
The extrude cut is bi-direction. The cut away from the cyilnder (downwards forming duct) is fine, the reverse dir is the problem.
I've only been using SW...
.. to add
if it where possible, i would sketch on the horiz, extrude cut to surface (cylinder wall surface) then extrude that cut (from the cylinder wall) again at 20 degrees down downwards for the duct.
Not possible it seems.
Updraft, tried that, but the curve of the cylinder wall made the top line curve up at the edges. I also tried a wrap (which solved the curve up) but i could not extrude the wrap. Dont think you can extrude wraps in SW
Hello,
I'm designing a two stroke cylinder. I'm trying to sketch the exhaust port and duct. I'm finding it difficult to sketch the outline of the port onto the cylinder wall and then extrude cut the duct. I have tried a 3D sketch on a plane at both the angle of the duct (20 degress from Horiz)...
