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Replies: 35 - Last Post: May 11, 2009 3:38 AM Last Post By: Josh_Petitt

98formulaLS1

Posts: 20
Registered: 08/14/08

how to make an ellipsoid?
Posted: May 7, 2009 5:23 PM

I have a knife, and I want to make an ellipsoid that I can cut into the knife edge to make it a serrated edge. Just like this tutorial: http://www.tutorialhero.com/click-53791-model_a_serrated_knife_in_rhino_3d.php

JDMather

Posts: 12,130
Registered: 04/20/06

Re: how to make an ellipsoid?
Posted: May 7, 2009 5:47 PM

in response to: 98formulaLS1

Revolve and then "Rectanglular Pattern" for curve driven pattern.
Can you attach what you have so far?

98formulaLS1

Posts: 20
Registered: 08/14/08

Re: how to make an ellipsoid?
Posted: May 7, 2009 5:56 PM

in response to: JDMather

Can I use the rectangular pattern to make a sphere-like divot in the edge of the blade?

I can't post what I have so far, I don't want to risk the design. This is for a company.

JDMather

Posts: 12,130
Registered: 04/20/06

Re: how to make an ellipsoid?
Posted: May 7, 2009 6:01 PM

in response to: 98formulaLS1

I don't want to risk the design. This is for a company.

Make up a sample problem. Five minutes of work.

Dennis Jeffrey

Re: how to make an ellipsoid?
Posted: May 7, 2009 6:02 PM

in response to: 98formulaLS1

Version of Inventor?

--
Dennis Jeffrey, Autodesk Inventor Certified
Expert
Autodesk Manufacturing Implementation Certified
Expert.
Instructor/Author/Sr. App Engr. Tel. (260) 399-6615
AIP 2008 SP3,
AIP 2009-SP1 PcCillin AV
AMD 64 x2 3.0 Ghz, 8GB RAM GeForce 9800GT 512MB

XP Pro SP3, Windows XP Silver Theme
http://teknigroup.com

98formulaLS1

Posts: 20
Registered: 08/14/08

Re: how to make an ellipsoid?
Posted: May 7, 2009 6:20 PM

in response to: 98formulaLS1

knife_test.ipt (360.5 KB)

Autodesk Inventor 2009 Pro

I've attached a basic knife with one sharp edge. I want to create ellipsoidal divots along the edge of the sharp blade, just like you see in the tutorial I posted in the first post.

Thanks in advance

JDMather

Posts: 12,130
Registered: 04/20/06

Re: how to make an ellipsoid?
Posted: May 7, 2009 6:35 PM

in response to: 98formulaLS1

Knife.zip (112.7 KB)

I had already spent the 5 minutes on this example. Pull down the EOP.

98formulaLS1

Posts: 20
Registered: 08/14/08

Re: how to make an ellipsoid?
Posted: May 7, 2009 6:39 PM

in response to: JDMather

opening the ipt in my 2009 shows no design. Theres nothing visible on the screen. I assume by EOP, you mean End of Part?

JDMather

Posts: 12,130
Registered: 04/20/06

Re: how to make an ellipsoid?
Posted: May 7, 2009 6:54 PM

in response to: 98formulaLS1

Theres nothing visible on the screen. I assume by EOP, you mean End of Part?

Then what did my instructions, "Pull Down the EOP" do, based on that assumption?

Dennis Jeffrey

Re: how to make an ellipsoid?
Posted: May 7, 2009 6:40 PM

in response to: 98formulaLS1

wickedblade-DJ.zip (454.9 KB)

Here's one I constructed in IV2009. You should be able to get
a couple ideas from it.

98formulaLS1

Posts: 20
Registered: 08/14/08

Re: how to make an ellipsoid?
Posted: May 7, 2009 6:42 PM

in response to: Dennis Jeffrey

Thanks, but I know how to use the rectangular pattern to make complete cuts through the blade. I want to make a 3D divot on the edge though, just like the picture of the link i posted.

JDMather

Posts: 12,130
Registered: 04/20/06

Re: how to make an ellipsoid?
Posted: May 7, 2009 6:52 PM

in response to: 98formulaLS1

Thanks, but I know how to use the rectangular pattern to make complete cuts through the blade. I want to make a 3D divot on the edge though, just like the picture of the link i posted.

If you know how to do the geometry Dennis posted what is the difference? Simply do the ellipse sketch above the part some distance.

JDMather

Posts: 12,130
Registered: 04/20/06

Re: how to make an ellipsoid?
Posted: May 7, 2009 6:52 PM

in response to: 98formulaLS1

If you post some exact dimensions I'm sure someone can give you the exact geometry.

98formulaLS1

Posts: 20
Registered: 08/14/08

Re: how to make an ellipsoid?
Posted: May 7, 2009 6:59 PM

in response to: JDMather

ok everything we've done in this thread so far has been all in 2D sketches. I need to make a 3D slide along a blade edge. It needs to end up looking like these:

http://www.bobticeknives.com/9-5_columbia_river2.jpg
http://images.coldsteel-knives.com/Lg/3385_1/29MTH_Cold_Steel_Voyager_Med_Tanto_Pt_50_50.jpg

EXACTLY LIKE THIS:
http://storesense.megawebservers.com/stores/HS1701/catalog/100_0529.JPG

not like these:
http://wooden-box.com/images/vn%20trekkor%20green%201h%201.jpg

Dennis Jeffrey

Re: how to make an ellipsoid?
Posted: May 7, 2009 7:04 PM

in response to: 98formulaLS1

WAIT! You already provided the EXAMPLE!

"Just like this tutorial: http://www.tutorialhero.com/click-53791-model_a_serrated_knife_in_rhino_3d.php
"

I'm done!

98formulaLS1

Posts: 20
Registered: 08/14/08

Re: how to make an ellipsoid?
Posted: May 7, 2009 7:09 PM

in response to: Dennis Jeffrey

Yes, I have provided many examples, but neither of you have been able to do it.

You two provided me with a knife blade with 2D cuts into the blade.

The examples I've provided have a sliced into the blade, leaving a spherical divot in the blade. That's what I need to figure out what to do.

So, if I were to ask anything, I would ask to PLEASE replicate EXACTLY the knife in my original example, please.

I'm sorry if you're getting frustrated, i wish we could chat on the phone about it, I think it would have come across more clearly.

JDMather

Posts: 12,130
Registered: 04/20/06

Re: how to make an ellipsoid?
Posted: May 7, 2009 7:11 PM

in response to: 98formulaLS1

Yes, I have provided many examples, but neither of you have been able to do it.

LOL

Is this a school project?

Dennis Jeffrey

Re: how to make an ellipsoid?
Posted: May 7, 2009 7:13 PM

in response to: 98formulaLS1

These are not 2D cuts. Zoom in and look closely. The Ellpsoid
cut is a revolve (ie; 3D)

JDMather

Posts: 12,130
Registered: 04/20/06

Re: how to make an ellipsoid?
Posted: May 7, 2009 7:10 PM

in response to: 98formulaLS1

Knife rev1.zip (110.9 KB)

EXACTLY LIKE THIS:

If you can't figure this out from the previously posted examples I will be offering a training class in a couple of weeks. Where are you located?

I fooled a bit more...
...probably wasted time.

98formulaLS1

Posts: 20
Registered: 08/14/08

Re: how to make an ellipsoid?
Posted: May 7, 2009 7:14 PM

in response to: JDMather

YES YES YES!!!! THATS IT!!!!
Thank you so much!

Dennis Jeffrey

Re: how to make an ellipsoid?
Posted: May 7, 2009 7:16 PM

in response to: 98formulaLS1

"YES YES YES!!!! THATS IT!!!! Thank you so
much!"

What is it? Are you a student?

98formulaLS1

Posts: 20
Registered: 08/14/08

Re: how to make an ellipsoid?
Posted: May 7, 2009 7:20 PM

in response to: Dennis Jeffrey

No, I'm not a student, but I'm not an Inventor Expert either. I'm just one of many engineers (electrical actually) who are Inventor self-taught, and we're designing a special tactical knife.

JDMather

Posts: 12,130
Registered: 04/20/06

Re: how to make an ellipsoid?
Posted: May 7, 2009 7:22 PM

in response to: 98formulaLS1

...we're designing a special tactical knife.

When I'm faced with a (redesign) geometry problem one of the best methods is to walk out to the shop floor and see how they actually make the part. My guess is a revolving grind stone. Hence a Revolve feature.

JDMather

Posts: 12,130
Registered: 04/20/06

Re: how to make an ellipsoid?
Posted: May 7, 2009 7:17 PM

in response to: 98formulaLS1

YES YES YES!!!! THATS IT!!!!

No different than previous posts - only different dimensions.

Dennis Jeffrey

Re: how to make an ellipsoid?
Posted: May 7, 2009 7:19 PM

in response to: JDMather

I see he likes you better! :)

Dennis Jeffrey

Re: how to make an ellipsoid?
Posted: May 7, 2009 7:32 PM

in response to: JDMather

Knife rev2.ipt (415.5 KB)

Of course, if you are slicing cheese.... :)

Dennis Jeffrey

Re: how to make an ellipsoid?
Posted: May 7, 2009 7:44 PM

in response to: Dennis Jeffrey

wickedblade2-DJ.zip (506.1 KB)

Of course, if you are grindin gboth sides, this is what you
get.

Albert Allen

Re: how to make an ellipsoid?
Posted: May 7, 2009 8:16 PM

in response to: Dennis Jeffrey

You guys are right on the edge today, what a bunch
of cut-ups!

"Dennis Jeffrey" <djeffrey@teknigroup.com> wrote in
message news:6179243@discussion.autodesk.com...

Of course, if you are grindin gboth sides, this is what you
get.

--
Dennis Jeffrey, Autodesk Inventor Certified
Expert
Autodesk Manufacturing Implementation Certified
Expert.
Instructor/Author/Sr. App Engr. Tel. (260) 399-6615
AIP 2008
SP3, AIP 2009-SP1 PcCillin AV
AMD 64 x2 3.0 Ghz, 8GB RAM GeForce 9800GT
512MB
XP Pro SP3, Windows XP Silver Theme
http://teknigroup.com

Albert Allen

Re: how to make an ellipsoid?
Posted: May 7, 2009 8:19 PM

in response to: Albert Allen

I really hope you guys get a handle on it before
things get out of hand!

Dennis Jeffrey

Re: how to make an ellipsoid?
Posted: May 7, 2009 9:02 PM

in response to: Albert Allen

That's what Duck tape is for...... :)

Albert Allen

Re: how to make an ellipsoid?
Posted: May 7, 2009 9:13 PM

in response to: Dennis Jeffrey

Duct tape on a hacksaw blade, one of my favorite
homemade tools!

"Dennis Jeffrey" <djeffrey@teknigroup.com> wrote in
message news:6179340@discussion.autodesk.com...

That's what Duck tape is for...... :)

--
Dennis Jeffrey, Autodesk Inventor Certified
Expert
Autodesk Manufacturing Implementation Certified
Expert.
Instructor/Author/Sr. App Engr. Tel. (260) 399-6615
AIP 2008
SP3, AIP 2009-SP1 PcCillin AV
AMD 64 x2 3.0 Ghz, 8GB RAM GeForce 9800GT
512MB
XP Pro SP3, Windows XP Silver Theme
http://teknigroup.com

Rich

Re: how to make an ellipsoid?
Posted: May 8, 2009 2:03 PM

in response to: Albert Allen

Around here we call it Wisconsin
Chrome!

TGIF!

Rich

"Albert Allen" <albert@sno-cat.com> wrote in message
news:6179348@discussion.autodesk.com...

Duct tape on a hacksaw blade, one of my favorite
homemade tools!

"Dennis Jeffrey" <djeffrey@teknigroup.com> wrote
in message news:6179340@discussion.autodesk.com...

That's what Duck tape is for...... :)

--
Dennis Jeffrey, Autodesk Inventor Certified
Expert
Autodesk Manufacturing Implementation Certified
Expert.
Instructor/Author/Sr. App Engr. Tel. (260) 399-6615
AIP 2008
SP3, AIP 2009-SP1 PcCillin AV
AMD 64 x2 3.0 Ghz, 8GB RAM GeForce 9800GT
512MB
XP Pro SP3, Windows XP Silver Theme
http://teknigroup.com

Dennis Jeffrey

Re: how to make an ellipsoid?
Posted: May 7, 2009 6:52 PM

in response to: 98formulaLS1

Look at the revolved feature (ellipsoid). I gave you the
model. Move the EOP to the top, then move down one feature at a
time.

Rich

Re: how to make an ellipsoid?
Posted: May 7, 2009 6:45 PM

in response to: Dennis Jeffrey

I would hate to have to sharpen that
one!

Rich

"Dennis Jeffrey" <djeffrey@teknigroup.com> wrote in
message news:6179150@discussion.autodesk.com...

Here's one I constructed in IV2009. You should be able to
get a couple ideas from it.

--
Dennis Jeffrey, Autodesk Inventor Certified
Expert
Autodesk Manufacturing Implementation Certified
Expert.
Instructor/Author/Sr. App Engr. Tel. (260) 399-6615
AIP 2008
SP3, AIP 2009-SP1 PcCillin AV
AMD 64 x2 3.0 Ghz, 8GB RAM GeForce 9800GT
512MB
XP Pro SP3, Windows XP Silver Theme
http://teknigroup.com

Dennis Jeffrey

Re: how to make an ellipsoid?
Posted: May 7, 2009 6:53 PM

in response to: Rich

Scary, but they would probably break off the first time you
slash someone.... :) Adjust the occurances to get what you
like. 38 does not look bad.

Josh_Petitt

Posts: 5,400
Registered: 09/21/04

Re: how to make an ellipsoid?
Posted: May 11, 2009 3:38 AM

in response to: 98formulaLS1

serrated_blade.PNG (396.1 KB)

I don't think you actually want an ellipsoid, per se. Unfortunately I'm using 2010, but I've attached an image that shows how I made the feature. Basically you want to use a sweep and the key to making it look right is to use the parallel orientation setting. I've attached a picture of the full knife here:

http://discussion.autodesk.com/forums/thread.jspa?threadID=727726

I've been wanting to model a knife for some time now, you post gave me a good excuse :-)

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