Inventor 2010 Sketch Doctor
Inventor Sketch Doctor:
You may inadvertently create sketch geometry that interferes with creating a feature. For example, you may have trouble selecting multiple profiles for an extrusion. Use the Sketch Doctor to diagnose the problem, such as checking for open loops or sketch elements on top of other geometry, then eliminate the duplicates.
Diagnoses problems in the sketch and recommends solutions. Is active in part, assembly, and drawing sketches.
Lists all errors in the sketch. Select the error to correct. The selected error is highlighted in the browser and graphics window. Click Next.
Lists diagnostic tests to perform on the sketch. Click a check box to select test. Results are added to the error list.
If the problem cannot be highlighted in the graphics window (for example, if it is caused by a missing geometry), the Highlight button changes to a Continue Examination button. Click the button to replay the feature history and find the source of the problem.
Provides detailed information and a suggested solution for the selected error. Click Unhighlight Problem to turn the highlighting off and on in the graphics window.
If the problem cannot be highlighted in the graphics window (for example, if it is caused by a missing geometry), the Highlight button changes to a Continue Examination button. Click Next.
Displays the options available to resolve the selected error. Click to select the appropriate treatment and click Finish to start treatment:
Close Loop instructs you to select a curve that connects to the start or end of the loop and continue selecting curves until the loop is closed. You can also select a sketch command and create the missing loop geometry.
Edit Sketch returns to the Sketch environment. Use sketch commands to resolve the highlighted problem.
Sketches form the basis of most model features. For example: a closed sketch region can be used to create a solid extrusion (or cut) in your model while unclosed sketch geometry is often used to extrude a surface. Finding an error in a sketch requires that you understand how each piece of sketch geometry relates to each other piece and that you understand how the sketch will be used to create subsequent model features.
If your sketch includes imported geometry that was originally created by another designer it is often more challenging to identify design errors. Unexpected behavior can often result while using imported sketches due to the way the geometry was created in the exporting system. Common issues include:
- Imported geometry that appears to define a closed region can have small gaps between lines and arcs. These gaps prevent the region from behaving as expected during the creation of a solid feature.
- Lines that appear to be perpendicular may not actually measure 90 degrees. This type of issue will often not become apparent until you attempt to assemble the part while assuming that the created feature has perpendicular faces.
- Autodesk Inventor adjusts the value of any exported dimension to reflect the size of the actual geometry. This type of issue can be problematic in cases where the original designer changed one or more dimensions rather than adjusting the size and position of the geometry.
The Sketch Doctor can help you find problems with open regions. Issues involving incorrect angles or dimensions require closer scrutiny.
Let’s take up a simple example to learn how sketch doctor can be used:
I have created a sketch using line command, as shown below
But as you try to extrude this sketch, you must get a solid entity. However, as a I select the sketch, I’m not able to select the profile as still it reads select profile when I move inside the loop.
So, now I got panicked and did not know what to do, so I tried a new command available within Inventor from a long time called sketch doctor and activated it by right click RMB in sketch mode
The Sketch Doctor Dialogue box appears,
Now click on Diagnose Sketch, to see the errors . . .
You are now prompted with a Diagnostic Test asking for the following
- Redundant Points
- Missing Coincident Constraints
- Overlapping Curves
- Open Loops
- Self – Intersecting Loops
Open loop found in this profile. Use Close Loop or use Edit Sketch and project geometry, add sketch geometry, and/or drag the loop endpoints to close the loop.
This gives an idea about ways in which we can treat the sketch for the given profile
I can either select the close loop option and treat them so that the sketch doctor closes them automatically or close them manually if the sketch errors are few in number
I prefer to close them using Sketch Doctor and select the treat option:
As I click on Yes, I get a message displaying Loop Closed
Now, as I select Extrude Option I get a preview for the extrude height.
The tool helps when complex sketches are drawn and in turn used to extrude and create a geometry.
Play with this tool and let me know if you face any issues, I’m sure, CAD Doctor, Oops CAD Professor may not come to your rescue than your own sketch doctor from Inventor