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Posts: 2
Registered: ‎12-03-2012
Message 1 of 5 (134 Views)

Desparate Help needed with translational constrains and Cam Lobes.

134 Views, 4 Replies
12-03-2012 11:44 PM

I'm having so much trouble getting my stupid cams and stupid valves to work for a class project. I keep getting conflicting constraint errors when the cams and stems clearly work for a few seconds. If I refresh the constraint, the thing works for like 5 revolutions and then the stops rotating on me and I get the constraint error. How the heck can I get thing thing to work, and stop complaining on me?! Please help.

 

Here's my cpu btw

 

intel core2duo 2.8GHz

windows XP SP2

nvidia 9800GT

2gb DDR2 ram.

 

Enclosed in the folder is the cam, valve, and cylinder head. Try aligning those valves in the cylinder head holes and placing a translational constraint between it and the lobes. It may work, considering the more constraints I have active, the more likely an error pops up.

*Expert Elite*
Posts: 25,269
Registered: ‎04-20-2006
Message 2 of 5 (115 Views)

Re: Desparate Help needed with translational constrains and Cam Lobes.

12-04-2012 04:33 AM in reply to: kurtanius21

I don't see an assembly file (*.iam).

 

Many of your sketches are undimensioned, yet when I dimension them they are perfectly sized.

Did you delete the dimensions?  If so, why?  If not, how did you get perfect sizes?

 

Sketch3 in Intake Valve3 is sick (invalid axis/origin).

I recommend you start here http://home.pct.edu/~jmather/SkillsUSA%20University.pdf

 

and attach the iam file here.

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*Expert Elite*
Posts: 25,269
Registered: ‎04-20-2006
Message 3 of 5 (113 Views)

Re: Desparate Help needed with translational constrains and Cam Lobes.

12-04-2012 04:39 AM in reply to: kurtanius21

It looks like there is a design flaw in this part.

Design Flaw.PNG

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Autodesk Inventor 2014 Certified Professional
Autodesk AutoCAD 2013 Certified Professional
Certified SolidWorks Professional
Inventor Professional 2014 Edu 64-bit
http://www.autodesk.com/edcommunity
http://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htm
New Member
Posts: 2
Registered: ‎12-03-2012
Message 4 of 5 (91 Views)

Re: Desparate Help needed with translational constrains and Cam Lobes.

12-04-2012 12:05 PM in reply to: JDMather

I removed the sicknesses from the valves and cylinder head. Here is the enclosed assembly. Let me know if I've included all the necessary parts. I'm new to inventor. The thing still gives me errors. And the error you pointed out in the cylinder head does have volume. The two cut lines do not intersect. I made sure of that. I just want the thing to rotate without giving me all these conflicting rotation errors. Thank you for your time!

*Expert Elite*
Posts: 25,269
Registered: ‎04-20-2006
Message 5 of 5 (76 Views)

Re: Desparate Help needed with translational constrains and Cam Lobes.

12-04-2012 02:18 PM in reply to: kurtanius21

The Cylinder Head is not grounded.

The Cam is missing.

 

Design flaw - because the wall thickness is about the same as a sheet of paper at location of major force - the engine is likely to fail on first attempt to start.

Please mark this response as "Accept as Solution" if it answers your question.
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Autodesk AutoCAD 2013 Certified Professional
Certified SolidWorks Professional
Inventor Professional 2014 Edu 64-bit
http://www.autodesk.com/edcommunity
http://home.pct.edu/~jmather/content/DSG322/inventor_surface_tutorials.htm

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