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michaelmead
Posts: 268
Registered: ‎03-02-2012
Message 1 of 7 (354 Views)
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rotation-translation not working

354 Views, 6 Replies
12-23-2013 09:56 AM
Ok, so I have been trying to get this constraint to work all weekend and it still is hopeless please help! Note I have Autodesk inventor standard NOT the pro version. I am a Revit professional in dire need of learning Inventor. My exact steps are as follows: 1. Open assembly 2. create component - (simple wheel(cylinder) with an off axis hole in the middle so I can see if it is rotating.) 3. create component- flat surface. 4. constrain the cylinder to the flat surface via a tangent constraint 5. constrain the cylinder to the front edge of the flat surface via a mate constraint. 6. go to motion tab in constraint's, click rotation-translation, type in 10in for distance. 7.wheel does not rotate on surface like a wheel should. There is no affect of the surface on the wheel rotation.In other words I want to get the circumferance of the wheel to rotate 360 degrees as it travels pi*diameter of flat surface. What am I missing? please help!
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gsmith9810
Posts: 115
Registered: ‎12-28-2012
Message 2 of 7 (332 Views)

Re: rotation-translation not working

12-23-2013 12:04 PM in reply to: michaelmead

The trick to setting up this constraint is to correctly select both parts. The first will be the rotational part. It should already be free to rotate about an axis and constrained to a fixed face. Then select the translational part by picking an edge representing the axis of translation. Open the attached ZIP. Drag the red "post" on the "pinion wheel" and the "rack" will translate.

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Gary Smith
Inventor Product Design Suite 2013sp2
Windows 7sp1 64-bit
nVidia Quadro 2000
Distinguished Contributor
gsmith9810
Posts: 115
Registered: ‎12-28-2012
Message 3 of 7 (316 Views)

Re: rotation-translation not working

12-23-2013 01:13 PM in reply to: gsmith9810
Above example done w/2013. - Gary
-------------------------------------------------------
Gary Smith
Inventor Product Design Suite 2013sp2
Windows 7sp1 64-bit
nVidia Quadro 2000
Mentor
michaelmead
Posts: 268
Registered: ‎03-02-2012
Message 4 of 7 (309 Views)

Re: rotation-translation not working

12-23-2013 01:36 PM in reply to: gsmith9810

I must be missing something as I am trying to delete all of your constraints and get the same results but I am failing. Can you please up load a screen shot recording or several pictures, because if it is something very particular I need to figure out my systematic error. I have attached my assembly of where I tried to recreate what you did but failed so you might be able to shed some more light on the subject. Thanks in advance.

Mentor
michaelmead
Posts: 268
Registered: ‎03-02-2012
Message 5 of 7 (303 Views)

Re: rotation-translation not working

12-23-2013 01:46 PM in reply to: gsmith9810
Nevermind i figured it out! I was picking the two contact surfaces when in reality you need to pick the face of the wheel and the EDGE of the part you want to translate not the face! Little counter-intuitive but whatever, i got it. Do you have to Align these surfaces by all these plane mates? Why cant you just use a tangent constraint on the wheel and the moving bar?
Distinguished Contributor
gsmith9810
Posts: 115
Registered: ‎12-28-2012
Message 6 of 7 (283 Views)

Re: rotation-translation not working

12-24-2013 09:14 AM in reply to: michaelmead

In the attached image, I am selecting the cylinder face as the FIRST SELECTION (shown on left).

 

I am then selecting the linear edge of the rack as the SECOND SELECTION (shown on right).

 

Doing so uses the circumfrential length as the ratio between the rack and pinion.

 

Gary

 

help2.png

-------------------------------------------------------
Gary Smith
Inventor Product Design Suite 2013sp2
Windows 7sp1 64-bit
nVidia Quadro 2000
Distinguished Contributor
gsmith9810
Posts: 115
Registered: ‎12-28-2012
Message 7 of 7 (279 Views)

Re: rotation-translation not working

12-24-2013 09:24 AM in reply to: gsmith9810

Michael - forgetting the translational constraint for the moment...

 

...in my example, the pinion is constrained to the face of the base plate as well as to the axis of the hole. The base plate is grounded. The pinion can be dragged rotationally.

 

The rack is touching the pinion face. It is constrained to the face of the base plate and it is flushed to the edge. It can be dragged back/forth.

 

Now: add the translational constraint and then drag the pinion to see the rack move by the circumfrential length/ratio.

 

Is all of that working for you in the example assembly when you open it?

 

- Gary

-------------------------------------------------------
Gary Smith
Inventor Product Design Suite 2013sp2
Windows 7sp1 64-bit
nVidia Quadro 2000

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