How is an arc created in 3d? I ahve tried and tried, to no avail to
find a way to do this. I also tried to find help in the help file,
but cannot seem to find the right words to search on. Can anyone help
me?
Rick Crawford
You are correct. I am trying to draw screw conveyor flighting, and
can't seem to get there from here. I also don't really know what a
spline really is. A 3dpolyline is not allowing me to do anything but
straight line segments. In the past, I have seen splines on 2d
drawings, and they slways seemed to be unwieldy, in that they could
not be exploded, and if anything changed them at all, they might not
really show the correct arc. Maybe that is what I need, but I need to
learn more before I use that.
Thanks,
Rick Crawford
Rick
I mananged a sort of 3d arc although it was a bit fiddly and is not as
smooth as I would like it but it would be an ok method for drawing a bridge.
Try it and see it you can improve it to suit your needs:
Kept it in World UCS.
I drew a construction line on a layer, so I had a start and end.
Changed the thickness to 20.
Drew a Start End Direction arc (For some odd reason it would not let me draw
a Start End Radius) between the two ends of the construction line.
That gave me a thin flat arc with a thickness of 20 units in the Z
direction.
I then copied this arc straight down 10 units using @10 You are correct. I am trying to draw screw conveyor flighting, and
Hi Rick,
I wouldn't mind to have a look at the parameters of the screw conveyor
flighting you are trying to draw
and see if I could draw it in 3D. I have some experience in modeling of ACME
threads and I think I could
apply the same principles for your requirements.
Reagards,
Igor.
Rick Crawford wrote:
Igor -
For example, a 9" Screw conveyor flight might have a 2inch pipe
throught the middle, (2.375 O.D.) and have a 9inch O.D. The cross
sectional area would be approximately .4375 at the base (by the 2 inch
pipe) and .3125 at the outer edge. One turn of the flighting would be
9 inch or in other words the pitch is the same as the outside diameter
of the flighting. Yes, I believe that if you could draw a true screw
thread, that this would require a similar process to draw. I would be
interested in learning how you draw the ACME threads.
Rick Crawford
flighting you are trying to draw
threads and I think I could
I work with AutoCAD because that is what the company I work for has,
not because of any other reason. That said, however, if you know of a
better program to so something like this, please tell us instead of
just saying we are wrong, and not telling us the right way to go. I
am not afraid of being told where to go, I have been told repeatedly.
I may even be able to talk them into changing to another software IF
it is not expensive. It must, however be compatible with AutoCAD
since we have customers that send us stuff, and all seem to use that.
Rick Crawford
SolidWorks, Solid Edge, Inventor, Pro Engineer, Alibre Design, Turbocad,
Cadkey. Shall I go on? Example: Using Turbocad Pro, I drew a screw according
to the discription below. Total time was less than ten minutes and I was not
in a hurry. Autocad works well within it's limits but if you do things like
you have been discussing very often, you would be better off looking around
at what else is out there. There are far too many people out there that have
a blind allegence to Autocad simpy becase they don't know better. It may be
the best CAD package for you. Then again, it may not. I have seen many
companies that use it simply because it's a big name and not realize that
another CAD package would suit there needs better.
Just ignore him, that's all. Your drawing of a screw conveyor is ready for
collection. Please
let me know where do you want me to send it. The file size is 530 Kb (in zipped
format). It took
me around 35 minutes to model it. That's because it has been a while since I
modeled screws in
3D. Getting rustier with this staff, you know .
Regards,
Igor.
Rick Crawford wrote:
Yes, be a good little Autodroid. Ignore progress. It is a lot easier to live
in the past.
collection. Please
zipped format). It took
I modeled screws in
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