Autodesk Inventor ® Master Sketch Example
Ok, so you have probably heard people mention Skeleton Modeling or Master sketch
modeling... so what the heck is it?
It is a method of making multiple parts share common points in their sketches. By
doing this you can make assemblies be completely adaptive without all the overhead
of using the normal adaptivity.
The basic concept behind it is to draw many of the defining sketches for parts of
a assembly in one ipt file. This ipt file is considered the master. Then each
part is made by deriving in the sketches pertinent to it, and using them to build
the part. After all the parts are built they can be easily brought into a IAM file
using theKWiKInsertNFix program.
32 bit version
64 bit version To make changes you open the Master.ipt file and make the
changes there. Then just use the update button in the IAM and everything will maintain
its relationships and locations with the other parts since the constraints are actually
controlled by the sketch constraints in the master.ipt.
From that method a slightly different method has evolved. There was always the issue
that "Purchased" parts weren't involved in the process until you got to the IAM
file. This made it a little harder sometimes. A couple of users in the AutoDesk
Newsgroup (Quinn Zander and Walt Jaquith) came up with this method. The basic idea
is to put the "Purchased" parts in a assembly and working off the origin planes
locate them where you want using assembly constraints. Now derive the solids from
that into a Master.ipt file and use the solids to base sketches off of. In the Final
Assembly file you can just place the purchased parts IAM along with the parts and
it all automatically fits together.
If the "Purchased" parts need to be moved, simply open their assembly, move them
as needed and then update the final assembly and if you have built your sketches
properly they will adapt to the new locations.
I have put together a example file and a little more detailed document. This certainly
won't make you a expert in the method, but may help you get a better understanding
The main files to pay attention to in the zip are
Purchased Parts.iam, Master.ipt, Top.ipt, Bottom.ipt, and Top Assembly.iam
The wires are 12v.ipt, Ground.ipt, and VDD.ipt.
The zip with Example files and the PDF Document.
iMaster.zip 2,118 KB
If you don't want the files, you can just download the PDF document here