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Cad Tutorial Number 5:

This Tutorial is meant to briefly overview Cam connections and distinguishes between all of the Analysis featureswe have learned in Pro-E thus far.

Enjoy!

PART 1:

1. Lets start with making a simple CAM connection. This part of the tutorial means to stress howimportant it is to make individual CAMS for all of your connections.

2. We have the Assembly shown below with two identical parts which are not constrained in the Assembly.

3. We need to constrain them using PIN connections but we have no idea what is the distance across theentities is. Therefore we dont know where we need to put the axis to make these pieces touch ends.

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4. We can however run anAnalysistoMeasurethe distance across this part by selecting Analysis, Measureand Distance. We then see that the distance across the parts is about 209 mm. Therefore, the distancebetween the two pin axis on the centers of these parts must be about 209 mm.

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5. We make axes by making planes that are perpendicular to each other first. We can offset two such planesat 209 mm from each other.

6. We then make the axes. Hold CTRL down, select two planes that are perpendicular to each other, thenclick the make axis button.

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7. When we are done defining both axes, we can bring in our parts and make PIN connections for both

parts.

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8. To define the CAMS we must go into Mechanism under Applications. In the directory window, underconnections, we should find the CAMS.

9. Click on the CAM button and a CAM menu should pop up.

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10.You must define each CAM with respect to the body it is on. We want all of the gear sides to touch eachother so that rotation is facilitated. If we had parts which only touched partially, like in the hw, we wouldhave to define each CAM surface individually. For example, the GENEVA gear has 4 individual surfaceson which CAMS must be defined with regard to the GENEVA key.

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11.Although in this example it is not required, one can set CAMS to separate. This is useful if there areindividual CAMS on one entity which we wish to turn fully.

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12. Click on the hand to see the functionality of your definition. If you want you can right click on a J ointConnection (one of the pins you just made) and add a motor to it. A servo motor actuates an object with aconstant velocity. A force motor actuates an object with a constant force.

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PART 2:Lets spend a little time on understanding all of the Analysis Features that Pro-E has and there are many.

The pump pictured below is much like the pump in your homework. We will add a motor to it and brieflyoptimize its pumping volume.

1. The rod is connected to the cylindrical shaft by a slider connection. When making such a connection, onemust specify the axis and planes onto which the part will slide upon the other part.

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2. By going in the Mechanism application of Pro-E, we can then specify zero and regeneration values of thepump.

3. We can make the top of the cylinder, before the cone, the zero reference with regards to the bottom of thepump.

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4. We can also set the regeneration values.

5. In order to make a realisitic model, we must set the sliding limits on the pump. The rod can only slide inup to the handle.

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6. Lets define a servo motor on the pump in order to make a Motion analysis. Go to J oint Settings, selectthe Slider joint you made between the rod and pump cylinder. Right click on it and then select servomotor.

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7. Select your motor to have a cosine profile, then check the dimensions you input with a graph. Make sure

your motor does not interfere with the minimum and maximum boundaries you constrained your sliderjoint with.

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8. In order to run your motor, you will have to create a motion analysis. Make sure the type of analysis youchoose is repeated assembly. This is to ensure that your motor gets selected. Then run your analysis andsee the pump work. Clicking OK will save your analysis.

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9. By clicking on the play button, you can save the playback as a .pbk file. Clicking on the smaller play

button within the menu allows you to capture a movie file. You can also do global interference motionanalyses from here.

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10.We can now go into the Standard Pro-E application and start analyzing our part. Lets do a measureanalysis first. We want to measure the distance the pump moves in and out and save this result as aparameter.

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11.We can now do a motion analysis of this distance and see what the minimum and maximum distance areper pump stroke. Click on the Analysis button select Motion Analysis and select the Distance parameteryou just made.

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12.When you click run, you will get a graph and the minimum and maximum stroke distance analysed bythe model.

This analysis has many sinusoids in it because in the original motion analysis, the motor was made

to run for 10 seconds instead of 1.

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13.Select to keep the minimum and maximum distance parameters from this analysis.

14.You can now run a sensitivity analysis on the pump you made to see how the distance changes as afunction of some length. The cylinder length has been selected in this example.

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15.A straight graph such as here shows no significant change in pumping ability.

16.We can set up a motion analysis with a relation to get the volume of the pumping amount.

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17.In the relation screen we can select the analysis where our Min and Max distance parameters are located.From there we can import them and write a relation for the volume. (not written since it is a homeworkquestion)

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18.The last thing we have to do is run an optimization analysis. From here we can select which parameters

to maximize, keep the same and which dimensions to alter.

You should now hopefully have a feeling for the location of the analyses and what you need to do for HW 8.

There is a very good section on the PDF provided in part one of the homework based on optimization.This section is Bookmarked under EX 4: USE IT!