What did I do wrong?

What did I do wrong?

evanp4509U4JZ
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Message 1 of 9

What did I do wrong?

evanp4509U4JZ
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I need a couple things to happen with this:

I need to move the switch .05" away from the pin.

I need the pin contact with the roller to actuate the switch.

 

I tried to move the switch but there is no option. I'm guessing because I projected geometry for the mount on the "block" but I don't know.

 

The pin actuates the switch but only if I partly actuate the switch first. Also, how do I make the switch spring back to the extended position? Is it a function of "REST" in joint limits?

 

https://a360.co/3kFZDJF

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Message 2 of 9

evanp4509U4JZ
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Collaborator

Try this

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Message 3 of 9

etfrench
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There is an interference between the block and the switch roller.

How far does the roller need to move in order to trip the switch?

switch.JPG

 

ETFrench

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Message 4 of 9

evanp4509U4JZ
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Collaborator

I didn't catch that. In application that will certainly trash the switch.

The problem is that I need the entire switch component to move .05" "up" in the picture. The joint limits set for the slider joint are from the McMaster drawing of the switch and I think the motion link is working correctly so I need the switch component to move .05" away from the pin. As it sits, I eyeballed the placement, the joint runs out of travel before the "pin" reaches it's full travel, again, trashing the switch. I went back in the timeline and edited the capture position of the switch placement but that made the timeline freeze there. I couldn't advance it or back it up. All the other components show the move option when I right click on them and if I right click in the field , select "move" I can select other components.

I'm lost.

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Message 5 of 9

etfrench
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The switch should be positioned relative to the block with a joint.  It is currently grounded, so you cannot move it. 

 

p.s. When I import models from McMaster-Carr, I leave them at the default position, then position them with a joint.  The joint is parametric while move and align are not.

ETFrench

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Message 6 of 9

evanp4509U4JZ
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Collaborator

I positioned the switch relative to the "pin" so as to get a location for the surface of the block with the cut out for the arm and roller then created the mount flange with the holes to by projecting the holes in the switch. One problem I found is that the switch comes in at a random actuation level according to the dimension drawing of it. The arm was sorta mid range in its operational envelope and I tried to use the outside of the roller as an orientation point. I should have confirmed the dimensions before starting and also started with the switch in the full actuated position.

 

I'll have to learn how to use joints more effectively in what are, to me, less intuitive situations. I forget that joints are basically statements of relativity between things and not necessarily mechanical joints as I see them.

 

I tried to unground the switch, both as an assembly and as the component "body" within the switch assembly and I still had no luck moving it, which seems to be the wrong thing to do anyways, but still no luck.

 

Thanks for the help.

 

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Message 7 of 9

etfrench
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Mentor

The mount for the switch should control the position of the switch by using dimensions and a joint.  All of the sketches should be fully constrained.  This is best done before adding joints.

 

 

ETFrench

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Message 8 of 9

etfrench
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p.s. I would change the upper mounting hole for the switch to an arc slot with the pivot point being the center of the lower hole.  This will allow you to easily adjust the trigger point of the switch.

ETFrench

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Message 9 of 9

evanp4509U4JZ
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Thank you very much.

I see now that by doing it that way the switch will track with changes to the dimension of the sketch for the mount holes. 

I also found that I misread the dimensions for the switch on McMaster. Thankfully, this is my Friday

Thank you again for taking the time to show this.

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