Using a part to remove some geometry

[DMF]

Using Inventor 8. While working in an assembly, Is there a way to use a part to remove material from another part? I know about project geomety, that won't work for what I'm trying to do. Kind of like if you moved one part into another part and do a interference check. The interference would turn red. Is there a way to remove the just red.

Thanks,
Don

[JDMather]

Start a new ipt.
Exit sketch mode.
Derive Component the assembly in the new ipt and select to cut the second part from the first. That takes care of a static problem.

If you have trouble figuring out zip and post the iam and two ipts in question.

Now if we could sweep one solid along a path in another solid...

[Anonymous]

il giorno 13/06/2007 14.07 DMF ha scritto:

> Using Inventor 8. While working in an assembly, Is there a way to
> use a part to remove material from another part?

I tried in IV11, but maybe it also works in IV8.
Use derivation to insert the part to use as cut tool (insert as
surfaces) in the part to be cut.

Then use division tool to remove the first geometry from the second one.

M.

[Anonymous]

While you cannot sweep a part, you can project the part to a sweep profile.

--
Dennis Jeffrey, AICE, MICE
260-399-6615
Instructor/Author/Sr. App Engr.
AIP 11SP2, AIP 2008
HP Pavillion Zv5000 (Modified)
Geforce Go 440, Driver: .8185, 2GB RAM
XP Pro SP2, Windows Classic Theme
http://www.design-excellence.com
wrote in message news:5624668@discussion.autodesk.com...


Now if we could sweep one solid along a path in another solid...

[Anonymous]

"Use derivation to insert the part to use as cut tool (insert as surfaces)
in the part to be cut.
Then use division tool to remove the first geometry from the second one."

That's WAAAAY to difficult...use JD's method instead.

--
T. Ham
CAD Automation & Systems Administrator
CDS Engineering BV

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--

[JDMather]

>While you cannot sweep a part, you can project the part to a sweep profile.

Show me an easier way to create this geometry that would result from sweeping an endmill along a path (sweeping a rectangle does not give correct geometry)
http://home.pct.edu/~jmather/content/DSG322/Inventor%20Tutorials/Inventor%2011%20Tutorial%2011.pdf

One of our local manufacturers designs CATV cable insulation stripping tools and prep tools. The geometry is a bit more complex than the linked tutorial. It is fairly easy to program on the CNC but a real bear to model (unless someone can show me a better way). I have the path from the CNC code - I just need to be able to sweep a cylinder with the resulting intersection removed.

[Anonymous]

Don,

In R11 or earlier, you can perform Cross Part Promote within an assembly.
1) Edit PartA.
2) Go to Part Features panel and select Promote.
3) Pick PartB in the assembly. OK.
The body of PartB will be copied to PartA. If PartA is empty, PartB body can
be copied as solid. If PartA already has a solid, PartB body can only be
copied as surface.
4) Use Split command to cut PartA using PartB body.
Please note that the copied body is non-associative.

In R2008, the same capability has been renamed and extended. The new command
is called Copy Object. The result can be associative or non-associative
depending on your settings.

Johnson Shiue
Test Engineer
Autodesk
(email: johnsonDOTshiueATautodeskDOTcom)
wrote in message news:5624609@discussion.autodesk.com...
Using Inventor 8. While working in an assembly, Is there a way to use a part
to remove material from another part? I know about project geomety, that
won't work for what I'm trying to do. Kind of like if you moved one part
into another part and do a interference check. The interference would turn
red. Is there a way to remove the just red.

Thanks,
Don

[Anonymous]

Here's a 2008 example using a sweep and a derived ball cut. See attached...
One way to do it....


--
Dennis Jeffrey, AICE, MICE
260-399-6615
Instructor/Author/Sr. App Engr.
AIP 11SP2, AIP 2008
HP Pavillion Zv5000 (Modified)
Geforce Go 440, Driver: .8185, 2GB RAM
XP Pro SP2, Windows Classic Theme
http://www.design-excellence.com
wrote in message news:5624750@discussion.autodesk.com...
>While you cannot sweep a part, you can project the part to a sweep profile.

Show me an easier way to create this geometry that would result from
sweeping an endmill along a path (sweeping a rectangle does not give correct
geometry)
http://home.pct.edu/~jmather/content/DSG322/Inventor%20Tutorials/Inventor%2011%20Tutorial%2011.pdf

One of our local manufacturers designs CATV cable insulation stripping tools
and prep tools. The geometry is a bit more complex than the linked tutorial.
It is fairly easy to program on the CNC but a real bear to model (unless
someone can show me a better way). I have the path from the CNC code - I
just need to be able to sweep a cylinder with the resulting intersection
removed.

[Anonymous]

Second try...

Here's a 2008 example using a sweep and a derived ball cut. See attached...
One way to do it....

--
Dennis Jeffrey, AICE, MICE
260-399-6615
Instructor/Author/Sr. App Engr.
AIP 11SP2, AIP 2008
HP Pavillion Zv5000 (Modified)
Geforce Go 440, Driver: .8185, 2GB RAM
XP Pro SP2, Windows Classic Theme
http://www.design-excellence.com
"Dennis Jeffrey" wrote in message
news:5624813@discussion.autodesk.com...
Here's a 2008 example using a sweep and a derived ball cut. See attached...
One way to do it....


--
Dennis Jeffrey, AICE, MICE
260-399-6615
Instructor/Author/Sr. App Engr.
AIP 11SP2, AIP 2008
HP Pavillion Zv5000 (Modified)
Geforce Go 440, Driver: .8185, 2GB RAM
XP Pro SP2, Windows Classic Theme
http://www.design-excellence.com
wrote in message news:5624750@discussion.autodesk.com...
>While you cannot sweep a part, you can project the part to a sweep profil

[Anonymous]

il giorno 13/06/2007 15.39 JD Mather ha scritto:

> Show me an easier way to create this geometry that would result
> from sweeping an endmill along a path (sweeping a rectangle does
> not give correct geometry)
> http://home.pct.edu/~jmather/content/DSG322/Inventor%20Tutorials/Inventor%2011%20Tutorial%2011.pdf

Astonish yourself!
(-:
M.

[JDMather]

Sweeping a rectangle does not result in the same geometry as sweeping a cylinder.
I do not have time to offer the proof right now but this problem has been discussed here in some detail in the past. If someone does not jump in here and show the difference I will come back to this sometime in the future.

Maybe I spoke to soon as I see you have added a guide rail with the path - but I am still very skeptical. Look forward to examining this closer. Message was edited by: JD Mather

[JDMather]

Ball end mill that does not go below the radius is trivial. An end mill cylinder sweep is much more complex geometry (to model).
This is a subject that I and others have spent considerable time on. I would be very interested in an elegant solution. Message was edited by: JD Mather

[tomtan]

like this

[JDMather]

Do that on a path around a cylinder. (in Inventor)

[Anonymous]

il giorno 13/06/2007 17.09 JD Mather ha scritto:

> Sweeping a rectangle does not result in the same geometry as
> sweeping a cylinder.

Now I understand what you meant.

> Maybe I spoke to soon as I see you have added a guide rail with the
> path - but I am still very skeptical. Look forward to examining
> this closer.

No, you are right: the rectangle doesn't keep normal to the path, it
keeps normal to the guide.

M.

[JDMather]

A rectangle can't work as the tangency between the cylindrical cutter and the sides of the slot is continuously variable. The cylindrical cutter is in effect an infinite number of rectangles arrayed about an axis - not just the one rectangle perpendicular to the path.

[Anonymous]

Just because this example has the sweep at the radius, does not mean that it
cannot go below the surface. See attached... Of course, at some point you
are going to need to lift the tool out of the part.... 🙂

So, JD, what is your more elegant solution?



--
Dennis Jeffrey, AICE, MICE
260-399-6615
Instructor/Author/Sr. App Engr.
AIP 11SP2, AIP 2008
HP Pavillion Zv5000 (Modified)
Geforce Go 440, Driver: .8185, 2GB RAM
XP Pro SP2, Windows Classic Theme
http://www.design-excellence.com
"Dennis Jeffrey" wrote in message
news:5624891@discussion.autodesk.com...
Second try...

Here's a 2008 example using a sweep and a derived ball cut. See attached...
One way to do it....

--
Dennis Jeffrey, AICE, MICE
260-399-6615
Instructor/Author/Sr. App Engr.
AIP 11SP2, AIP 2008
HP Pavillion Zv5000 (Modified)
Geforce Go 440, Driver: .8185, 2GB RAM
XP Pro SP2, Windows Classic Theme
http://www.design-excellence.com
"Dennis Jeffrey" wrote in message
news:5624813@discussion.autodesk.com...
Here's a 2008 example using a sweep and a d
erived ball cut. See attached...
One way to do it....


--
Dennis Jeffrey, AICE, MICE
260-399-6615
Instructor/Author/Sr. App Engr.
AIP 11SP2, AIP 2008
HP Pavillion Zv5000 (Modified)
Geforce Go 440, Driver: .8185, 2GB RAM
XP Pro SP2, Windows Classic Theme
http://www.design-excellence.com
wrote in message news:5624750@discussion.autodesk.com...
>While you cannot sweep a part, you can project the part to a sweep profil

[JDMather]

>Just because this example has the sweep at the radius, does not mean that it cannot go below the surface.

I haven't bothered to open your Inventor file to check the geometry but I suspect you are missing the point. Are you familiar with the past work of Jeff Howard on this type of problem? Did you roll up the EOP? That file size looks rather large. I am on a 26.4Kb DUN. (yes I typed that right)

>So, JD, what is your more elegant solution?
Where did I say I had an elegant solution? The best I can do is the cited tutorial borrowed from Jeff Howard.

[Anonymous]

il giorno 13/06/2007 19.15 JD Mather ha scritto:

> A rectangle can't work as the tangency between the cylindrical
> cutter and the sides of the slot is continuously variable. The
> cylindrical cutter is in effect an infinite number of rectangles
> arrayed about an axis - not just the one rectangle perpendicular to
> the path.

I think that the rectangle could work, but it has to be perpendicular
to the path. My attempts seem to have failed this goal.

I tried to change things in order to make it possible (see attached
cam.ipt).
But I could sweep as surface, but not as solid.

The assembly should show that the surface could really be the path for
the follower. Try to animate the constraint named DRIVE_ME.

Now I think that Inventor developers have a new problem to solve: why
the profile sweeps as surface but not as cut?

M.