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adding scaled image into Sketcher

Contributor

adding scaled image into Sketcher

I have been successful at importing an image (jpeg) into Creo 3.0 model.  The only thing I cannot seem to get to work in my favor is the right scale.  I can get either a horizontal scale or a vertical.  My jpeg is plans of a model airplane.  I scale the horizontal according to the bar scale on my jpeg.  I do not think the vertical is correct.  How can I get this image to scale properly?

18 REPLIES 18

Re: adding scaled image into Sketcher

Is there no one who has tried to bring in a 3D view of an object and try scaling it to Full Scale?  I have seen a couple of You Tube Videos on bringing in an image into Sketch Mode but the Scaling issue is a little fussy.

Re: adding scaled image into Sketcher

Trace Sketch functionality should support this. It allows for scaling the imported object.

Re: adding scaled image into Sketcher

TBRAXTON: I am not familiar with the Trace Sketch command.  Is that an ability in the actual Sketch Mode ore in the Drawing/Sketch tab?  I have imported the image I want into both a part file and then having it show in the Sketch mode for doing an Extrude and I have imported an image while in a Drawing using the Layout tab.  I have tried using both scaling features and they do not quite scale the image 1:1.  There is a scale bar and trying to get a close scaling match seems to be lacking. 

 

I have be able to put the image into AutoCAD 2018, trace the outline I need and then export as a DXF file and then insert it into a Creo drawing and have it the correct scale.  However I need to be able to bring in the image and get an accurate scale because I am going to lose my AutoCAD license soon.

 

This Trace in Sketch, can you tell me where it is?

Re: adding scaled image into Sketcher

"Trace Sketch" is the old name for the functionality that is now under the "images" command in the View tab under the "Model Display" area.  I suspect that is what you are using to add images to your model.

 

The best way I've found to scale an imported image is by creating a sketch that is the correct scale and then using the tools in the images area to drag and scale image to visually match the sketch.  For example, if you know that part of your plans is 15" long and 4" tall, sketch a 15" x 4" rectangle and align that part of your image to the sketch.

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Doug Schaefer | Experienced Mechanical Design Engineer
LinkedIn

Re: adding scaled image into Sketcher

Doug,

I understand what you are says about sketching the rectangle and then align it by the image outline but that still does not solve the scaling issue of the drawing.  If a drawing (image) is 22x34 and the scale is 1:4, then my sketch to create a model is going to be 1/4 the real size.  In AutoCAD I bring in the image, go to a dimension and drawing a horizontal line equal to the dimension on the print, then align it to the end points.  In Creo, I attach the image to a plane and go to FIT>Horizontal then on the graphics area a redline appears and I put one point on one end of the dimension and the other point on the opposite end and it scales the image.  However, when I go to sketch to trace the image under the Extrude Feature, the accuracy is off by sometimes an inch.  I would not mind so much except I am trying to trace an airfoil shape of a wing and it needs to be close to within 1/8" of an inch.

 

I am using the Images Tools under, model display in the View Tab.  The other thing is making sure the aspect ration is correct.  On You Tube someone is creating a Toyota 86 and he aligns it first along horizontal and then vertical.  I try it that way and it screws everything up.

 

I guess the best way is to using the old Drafting Dividers, Pencil, and scale then input manually into Creo.  Modern technology is sometimes lacking, lol!

Re: adding scaled image into Sketcher

First of all, why not create it full size and eliminate the scaling to 1:4?  You can always scale the model at the end.

 

Secondly, without seeing your data it's tough to figure out what's happening.  My guess is that perhaps the image you are bringing in is not the correct proportions.  That's one advantage of scaling to a sketch rather than using the fit command.  You have true geometry that's the right size in X and Y and you can see right away if there is a mismatch in one or the other.

 

Another advantage is that you can position your sketch relative to the default coordinate system (origin) where you want it and therefore position the image accordingly.

--
Doug Schaefer | Experienced Mechanical Design Engineer
LinkedIn

Re: adding scaled image into Sketcher

Hello Doug,

I attached a pdf of the set of plans I am trying to convert into a 3D model so I can laser cut parts and make sure all assembled parts fit. In order to get this pdf into a jpeg to insert into Creo I did a screen snip with the Snipping Tool.  The only thing to get a proper scaling is the scale bar listed in the middle of the drawing.

 

if I bring in the image at a scale of 1:1 based on outer dimension of image and not the scale bar then I cannot make it scale.  The scale bar is the only thing available that is close to a correct dimension.  When you scale in a program like AutoCAD then there is an Aspect Ratio built in so if you align to the 6" scale bar horizontally you get the correct ration for the height.  I cannot seem to even get a correct horizontal alignment in Creo so I can create models of the same size as the drawing.

 

-Scott

Re: adding scaled image into Sketcher

If you use the fit tool, first drag the end points to the ends of the 6" bar.  Then edit the value of the length of the fit bar to 6".  That will scale your image appropriately. 

--
Doug Schaefer | Experienced Mechanical Design Engineer
LinkedIn

Re: adding scaled image into Sketcher

I have tried that again.  I attached images comparing AutoCAD to Creo.  The difference is .140" (rounded) which since the Creo is so pixelated it is a good fit.  I have not do a height comparison but I am thinking it will also be close.

 

At least this seems to be better than Solidworks.  Solidworks has close to the same tool but it is a one time shot, at least the program I am using at a local library.    I have not been able to size it more than once without deleting image then reimporting image.  Due to fuzziness of the image, I will take the 9/64" difference.

 

-Scott