Inventor General Discussion

Inventor General Discussion

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Active Contributor
leech10
Posts: 40
Registered: ‎01-24-2012
Message 1 of 44 (600 Views)

Rounf extrusion

600 Views, 43 Replies
12-11-2012 02:25 PM

Hi



Thanks for your help. I have done my piston apart one thing. I attached 3 pictures. I dont know how to do cut like in the tutorial. I tried to do circle in cut view mode. (I attached a picture) but I dont know how to go round with it. Moreover when I click finish sketch the second part of the piston appears and I dont see cut of my model. When I am creating sketch in this mode I cannot see anything highlighted on the piston cut when I move the cursor on so It is also difficult to determine where the center of the piston part is.



Regards

Piotr



P.S. Is it difficult to animate reciprocating engine, only one piston and valves, I wanna prepare presentation

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JDMather
Posts: 28,228
Registered: ‎04-20-2006
Message 2 of 44 (573 Views)

Re: Rounf extrusion

12-11-2012 04:05 PM in reply to: leech10

The turorial shows a Revolve - Cut, not an extrude.
Also - it appears your sketch isn't constrained like it is in the tutorial image.

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

 

Animation is simple, but it looks like you are a long way from being ready for animation.

Attach each one of your part files here as you complete them.

Please mark this response as "Accept as Solution" if it answers your question.
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Active Contributor
leech10
Posts: 40
Registered: ‎01-24-2012
Message 3 of 44 (537 Views)

Re: Rounf extrusion

12-12-2012 01:37 AM in reply to: leech10

Hi

 

All of the parts, except camshaft( I saw that there is generator in iam mode, so I have not created it in the part mode) are attached. I know there is for sure constrain issue in cylinder as I had a problem with extrude command. I found Project geometry function which shows this piston better, when it is cut. I saw animation with blue intake air and red combustion/exhaust air comming thru valves. I thought about such an animation. 

 

Please check if those parts are correct for this. Then I will try to assemble them. I dont know if I have to make some gears and cambelt to have proper valves opening times or if there is another posibility to telll the iventor about crankshaft-camshaft revolution ratio.  

 

Regards

Peter

Active Contributor
leech10
Posts: 40
Registered: ‎01-24-2012
Message 4 of 44 (521 Views)

Re: Rounf extrusion

12-12-2012 03:47 AM in reply to: leech10

I made also assembly, but I have a problems with setting appropriate degrees of freedom. i.e. setting piston moving up/down in cylinder or crankrod attached correctly to crank

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JDMather
Posts: 28,228
Registered: ‎04-20-2006
Message 5 of 44 (496 Views)

Re: Rounf extrusion

12-12-2012 07:45 AM in reply to: leech10

Everything you have done is not done correctly - close, but not correct.

Are you interested in learning how to do this stuff correctly (I can get you started on one part and then I think you will be able to quickly figure out how to fix the others).

Please mark this response as "Accept as Solution" if it answers your question.
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Active Contributor
leech10
Posts: 40
Registered: ‎01-24-2012
Message 6 of 44 (484 Views)

Re: Rounf extrusion

12-12-2012 08:32 AM in reply to: leech10

Hi

 

Yes I am very interested. I hope that I have done at least one thing correctly:-( 

 

How would you like me to show how to do this?

 

So that means I dont have to draw it from the beginning but just correct those ones I have done? Or I have to draw it from the beginning( I will do if neccessary, good to know how to draw correctly from the beginning and how to fix wrong ones)

 

Regards

Piotr

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JDMather
Posts: 28,228
Registered: ‎04-20-2006
Message 7 of 44 (479 Views)

Re: Rounf extrusion

12-12-2012 08:53 AM in reply to: leech10

I recommend that you start by reading this document

http://home.pct.edu/~jmather/SkillsUSA%20University.pdf

 

then open your Valve.ipt and edit Sketch1.

Notice in the lower right corner of the screen that Inventor indicates that you would need 26 missing dimensions to manufacture this part.

 

Notice that you are missing a bunch of Horizontal and Vertical Constraints.

For example, notice that the 12.5 line is not constrained horizontally (if you don't see your constraints - click the right mouse button and select Show All Constraints).

In fact there is only one vertical constraint.

I don't really understand how you are doing this as Inventor should automatically be creating those constraints.

 

Notice that there is more than one vertical line (see red circle) where there should be only on vertical line from bottom to top of the part.

 Valve.PNG

 

 

I recommend you start the part over from scratch in a new file to compare the new technique you will learn to how you originally did the part.

 

 

Sketch one horizontal line from the origin to the right and dimension it 12.5

Did you notice anything when you  dimensioned (line should change color).

Show All Constraints - Inventor should have automatically added a horizontal constraints - no extra work for you, in fact, you are already doing lot of extra work.  We are going to get lazy and do less work.

Notice in lower right corner of screen that it says Fully Constrained.

 

Draw 1 vertical line from origin and dimension for height of the part.
Go back to your original and add this missing dimension.

Notice anything different?

 

Attach the new file here for further instruction.

Please mark this response as "Accept as Solution" if it answers your question.
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Active Contributor
leech10
Posts: 40
Registered: ‎01-24-2012
Message 8 of 44 (466 Views)

Re: Rounf extrusion

12-12-2012 09:51 AM in reply to: JDMather

Hi

 

I found 1st issue. I had auto constrain function turned off. I read about it in your article. But Even if I draw just simple line it does say 2 dimensions needed. Constrain is added automatically but which dimensions are needed?  Sketch doctor says that everything is fine, but sketch is not constrained

 

Regards

Distinguished Mentor
john.retzlaff
Posts: 947
Registered: ‎11-03-2003
Message 9 of 44 (461 Views)

Re: Rounf extrusion

12-12-2012 09:58 AM in reply to: leech10

Did you project the center point from the origin folder and constrain some point in your sketch to it?

If so try putting a horizontal constraint on the bottom line and see what happens.

 

John Retzlaff
*Expert Elite*
JDMather
Posts: 28,228
Registered: ‎04-20-2006
Message 10 of 44 (448 Views)

Re: Rounf extrusion

12-12-2012 10:15 AM in reply to: leech10

See Tip #6 (this should be default).

http://home.pct.edu/~jmather/SkillsUSA%20University.pdf

your origin is not automatically projected.

 

Now sketch one horizontal line from the (projected) origin to the right.

Dimension it and attach the file here. (don't create anything else, once we fix the problem for this one line - everything else should fall in place)

your origin is not automatically projected.

 

Now sketch one horizontal line from the (projected) origin to the right.

Dimension it and attach the file here.  (don't create anything else, once we fix the problem for this one line - everything else should fall in place)

Please mark this response as "Accept as Solution" if it answers your question.
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