I am working on a drawing with a lot of splines. I need to dimension the curves to some rational dimensions which means I need to convert the splines to arcs. Is there away to do that?
View 4 RepliesI have a bugging problem.
I usually use Inventor to create a model from customer supplied blueprints, and then use the model to get the 2D geometry into
AutoCAD for further processing.
Now, unfortunately Inventor has a pitiful 2D drawing method, where circles and arcs that do not lie exactly on the plane end up as a spline.
They are true arcs and circles and should be true arcs and circles on the 2D view, but aren't.
What I would like to do is turn them into one.
Is there any command or method to do that?
I was hoping that Overkill would work ..... it doesn't.
How can I convert arcs to splines.
View 5 Replies View RelatedI have 3 scientific waveforms, made into splines , from X,Y and Z data. Basically 3 long wiggly lines.
I wish to visualise the data by modulating a spheres surface in 3 dimensions so that the X data creates wave on the surface of the sphere running along the x-axis , the Y data along the Y axis and the Z along the Z axis. All the data (splines) will interfere and modulate with each other across the surface.
I have spent a couple of days looking at nurbs and lofting but cannot even get close to this. They all only allow splines in 2 dimensions to interact and nurbs cannot cope with the data volume anyway.
ps i can obviously extrude the 1d data or lathe the data but each only makes 1 or 2d surface interaction. The attatched pic is each one of the data splines made into a sphere using a 180 bend and lathe. This isnt exactly how id ideally have it. I need all three joined into one shape.
I'm writing a script file that will make a few splines and loft them. I wrote out the lines of code and saved the file as a .scr. When I load the script, it will do the first spline but it will not graph the second. It takes the spline command as if it were another point. The text window for the end of the first spline and beginning of the second reads like this:
Specify next point or [Close/Fit tolerance] <start tangent>:
0.000000,0.000000,0.010000
Specify next point or [Close/Fit tolerance] <start tangent>:
Specify start tangent:
Specify end tangent:
[code]....
I searched and saw lots of posts on converting a spline object into a pline, but not the other way around. I like the way that splines can use control vertices or fit points.
I know that you can apply a spline smoothing to a pline, but what I'd like to do is to convert a pline object into a spline object and splining a pline does not do that.
Any fairly easy way to do this? Are there LISP routines that do this?
I use splines a lot to provide a contiuous smooth curve between two lines which are co-planar. The splines are drawn by connecting the ends of the two lines and then the tangent direction set by hovering over the end grips. I then use the FLATEN command to convert these splines to polylines that can have their lineweights set to a value other than 0. My problem is that sometimes when i use the FLATTEN command, the spline is erased.
View 7 Replies View RelatedSSA rational method. I have to compare results of rational method between SSA and another product. Plain rational method, steady flow, Darcy-Weisbach. Times of concentration (TOC) are manually defined.
I played a bit with the units, formulas, IDF curve is defined as pair of values time/intensity. Seems that I achieved something. Results are more or less similar, but there are some differences. After playing with both programs, comparing in Excel, think that I found what is different.
So, I have very simple example, of one channel with catchment areas. All areas have the same runoff coefficient – 0.8. Pipe diameters are constant (500). The whole analysis is restricted between 5 and 10 minutes of rain duration (5 min-397.22 l/s/ha and 10 min – 321.53 l/s/ha). I converted IDF to mm/hr. So I have the next example:
[picture in attachment]
In theory, what I learned about rational method, there is next definition:
Intensity from IDF curve is defined by TOC. TOC is defined by sum of „entrance time“ (which is defined by shape and size of catchment area) and sum of upstream flow times. In my example I defined 5 min for every area.
So, for example for pipe nr. 3, TOC is calculated:
TOC_3 = Entrance time for area 3 + Tflow_1 + Tflow_2 + Tflow_3
For example:
TOC_3 = 5 min + 0.67 + 0.45 + 0.51 = 6.63 min
That TOC_3 (6.63 min) is base for reading appropriate value of intensity (I_3) from IDF curve. The flow in pipe 3 is then calculated:
Q_3 = I_3 * (A1 * k1 + A2 * k2 + A3 * k3)
This is the way how I learned rational method. But results between SSA and another product (which works in a way explained above) are different. Differences increase downstream.
After playing with results in Excel, I found out that SSA does not summarize in TOC all flow times upstream. So TOC in SSA is calculated simply by initial entrance time and flow time in specific pipe:
TOC_3 = Entrance time for section 3 + T_flow_3
So, there is no time added from T_flow of pipes 1 and 2. Seems that it is major difference which leads to final results differences. I tried to understand all options of SSA to find possibility to add upstream flow times, but without success.
If I have imported a large multi-spline object, is there a way to bust it up into separate splines easily -- without having to detach each one individually?
View 3 Replies View RelatedI have a block that I would like make dynamic. It is a fishhook arrow for a roundabout traffic sign. I would like to rotate the head to various angles, and have the body of the arrow adjust. I already have the ability to stretch the two end points in their direction, and rotate the head, but the curved part of the arrow body needs to adjust for the new head location. I tried dynamic stretch, but it would not attach to the rotate dimension. How do I get these arcs to stretch along their radii and associate the end arc points to the near end of arrow head?
I had one thought of using multipe arcs so that they would overlap more or less as rotated, but this is a pretty crude workaround.
LT, C3D 2005 - 2014
XP, Vista, 7
I am using AutoCAD 2012. I am trying to use ordinate dimensions for the first time. So far, when I want to add the X and Y dimensions for a particular feature in my drawing, I choose the "ordinate" dimension type and then I select my feature. I drag my leader horizontally and it gives me the Y dimension. Then I choose the "ordinate" dimension type again, I select my feature again, and this time I drag my leader vertically and it gives me the X dimension.
I like how this works, but I think I would like it better if, rather than having two separate leaders for X and Y dimensions, I could just have one leader that would show both X and Y dimensions separated by a comma...i.e. something like [X:5.0; Y 7.5]
I have some aligned dimensions in model space - they look ok, text is oriented according to WCS. Also I have some viewports with UCS (I used commands UCS, PLAN) where dimensions look wrong, text is not oriented correctly. Is it possible to "update" dimension in viewport to orient text as in model space?
Programmatically created dims in viewports oriented as in model space, not considering current UCS.
When I make a layout with a part of my drawing in a viewport, I switch over to paperspace to draw dimension lines in it. Although the layout is displayed in another scale (e.g. 1:100) it puts the right dimensions at the drawing.
But now a problem appears:
With one of my drawings the layout does not put the right dimensions at the drawing in paperspace. I really don't know what went wrong. Strange dimensions appear, as if there must be a strange scale factor somewhere. (Dimlfac=1)
I'm working out some bugs that have cropped up now that I've upgraded to 2011. For starters, I can't seem to be able to snap to existing dimension lines like I used to, even though I have almost all of my snap types activated.
View 5 Replies View RelatedIs it possible to suppress alternate dimensions below a certain value? I would like my dimensioning to be set up as follows.....
everything above 8 feet
97 1/2" [8'-1 1/2"]
everything below 8 feet
94 3/4"
I had the need on occasion to dimension in Paper Space. I set up a "Dim Style" to accomplish this in either 1/8" or 1/4" Scale. The problem I am having is the consistency of the actual dimension.
For example: I could draw a simple box 10'x2'. When I dimension in Paper Space, sometimes it correctly displays the dimensions and sometimes it incorrectly displays the dimension.
I attached 2 screen shots of what is happening. Notice the dimension on top of the box shows 10', but when I dimensioned the bottom of the box it shows 480'. This seems to work at random.
The other screen shot shows the Dim Style settings I used.
I am unable to see the dimensions that I measure using power dimensions as per the attachment on the drawings itself. If i want to see it, I have to select the green line, and right click and select the line and select standard as the dimension style. I did not have to previously do all of this.
View 1 Replies View RelatedI've completed a drawing, with dimensions and everything and I have to reduce it to 1:2 scale to fit my drawing frame. How do I do this without changing the dimensions? Every time I reduce it the dimensions halve as well!
View 9 Replies View RelatedWe do a lot of labeling in paper space and have been encountering a problem with our dimension command mislabeling lengths and widths. Please see attached DWG. The road width should be 24' and its labeling it 880'. BUT measuring hoizontally it seemed to work fine. Really strange.
I am using the dimension command and snapping nearest and perpendicular. If I just click without using osnap it seems to work.
We tried using the DIM / DIMFLAC / V / and selectiong viewport
The funny thing is that I dont have this problem with every drawing. Just some seem to have this glitch.
I have some serious fight this morning with AutoCAD. I have to dimension my drawings properly so it can be build. I did some already, a few aligned dimensions in an layout snapping on modelspace objects. when i put them all is fine and right dimensions.
BUT after i saved, closed the file and opened it again those dimensions are everywhere exept where i put them originally. And no the modelspace objects are not moved.
How can this be? can i solve this? or is this a know bug for AutoCAD 2012? i can't check all the dimensions before publisching again and again.
How can I set dimensions to not show inch tick by default just the number?
View 1 Replies View RelatedWhy is it that some dimensions in a viewport are out of sync with the rest of the dimensions? Eg. a correct dimension is 240, but the next time you dimension the same distance, you get 24 as a dimension figure?
Also, in a long run of continued dimensions one or two of the dimensions is out of scale? I have tried making all dimension Annotative, same dimstyle, etc.
I think sometimes Autocad forgets that it is in a viewport, so some dimensions are correct to the viewport scale while others are to the limits of the paper size?
I am looking for a way to get my dimensions to round up instead of to the nearest.
For example... when I have one line that is 11-15/32" and one that is 11-17/32" and I need them to round up to the nearest 1/4". I want it to round up, showing 11-1/2" and 11-3/4" but instead i get 11-1/2" for both.
When dimensioning in paper space and move or make any adjustment to the viewports the dimensions go haywire and move of the parts but not all dimension and not all viewports are doing this. I'm using the same dimension style and templates that I normally use.
View 2 Replies View RelatedIm trying to find a way to select just the vertical dimensions. Quick select doesn't work because it selects every dimension.
View 2 Replies View RelatedI have an existing facility drawing that I'm trying to edit and when I try to dimension something it disappears after I click enter for the final time. I've tried to explode the drawing numerous times, save it in different formats, and copy and paste it to a new drawing. Nothing seems to work. How can I get the dimensions to show up?
View 9 Replies View RelatedI am looking for a fix to the issue when scaling a view in MView from Paperspace all the dimensions in paper space move to outside the dinamic area of the border?
View 1 Replies View RelatedI'm trying to figure out two things that have changed:
1) Lets say i create a polyline, lets say its 15 inches long. I used to be able to click on it and have the length show up in my properties. it no longer does that.
2) Lets say i create a polyline, it's green and has a dot pattern. I decided i wanted to change it to yellow and hidden pattern. I can no longer select the line and change it under the properties, it will change it in properties, but not on my screen. then when i draw a new line it will be yellow and hidden. I end up having to matchprop to make it work.
Using the same template Text and Dimension style all of the sudden the text is vertical and mirrored and the dimension text is mirrored under the dim line ( above the dim line in normal conditions)
What could be the problem? I did not change anything in the settings, voluntarily, I use this template for years and never had a problem with it till now.
See the bubbled text in the attached PDF.
Is there command or option for masking the text of a dimension? If not, how to get around this?
View 3 Replies View Relatediam using autocad 2010.The dimensions and the text have suddenly disappeared even though the layers are on.
View 2 Replies View Related