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Unable to do a slot mate when teeth have been added to the slot

Question asked by Asko Kauppi on May 19, 2018
Latest reply on May 20, 2018 by Kevin Chandler

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I'd like to tie the shaft to the slot (see picture), but the "slot mate" doesn't recognize the slot any more, since teeth have been added to it.

Expected:

- I would be able to select the slot, by clicking on either: the outside edge (no changes there), the corners (no changes there), and the slot mate would be established.

Actual:

- Slot mate does not detect any selections on the edited slot as a slot. Therefore, the mate cannot be made.

How would you do such a mate?

The teeth are added as a curve pattern.

SW 2018 SP 2.0

Dennis Bacon May 19, 2018 8:31 AM

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Asko,,, In your Halo part I made an offset surface of 0 all around your slot. This feature is right after your Boss-Extrude1 prior to you adding the teeth.

Then in the assembly I was able to use the slot mate on that. The screenshot is with the Halo body hidden.

Of course you can then hide the surface offset and unhide the Halo body.. This seems to work out pretty well since with the free constraint the shaft is still constrained to the ends of the slot.

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Solid Air May 19, 2018 5:59 AM
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Not at my computer right now. if there is a sketch for creating the slot with a line representing the center, try mating it to the temporary axis of the shaft.
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Dennis Bacon May 19, 2018 8:31 AM
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Asko,,, In your Halo part I made an offset surface of 0 all around your slot. This feature is right after your Boss-Extrude1 prior to you adding the teeth.
Then in the assembly I was able to use the slot mate on that. The screenshot is with the Halo body hidden.
Of course you can then hide the surface offset and unhide the Halo body.. This seems to work out pretty well since with the free constraint the shaft is still constrained to the ends of the slot.
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- Asko Kauppi @ Dennis Bacon on May 19, 2018 5:39 PM
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  Nice, and thanks.
  There's no way I could have come up with the zero offset surface solution, on my own. It kind of makes me realize what the underlying magic within SolidWorks is, for recognizing something as a slot (it's the geometry, not a metadata).
  I was previously expecting that the creation of a slot somehow would mark the boundaries as such. But I can live with this. Made a little comment to the 0 offset slot so I remember why it's there.
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- Kevin Chandler @ Dennis Bacon on May 19, 2018 5:41 PM
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  Dennis Bacon wrote:
  
  Asko,,, In your Halo part I made an offset surface of 0 all around your slot. This feature is right after your Boss-Extrude1 prior to you adding the teeth.
  Then in the assembly I was able to use the slot mate on that. The screenshot is with the Halo body hidden.
  Of course you can then hide the surface offset and unhide the Halo body.. This seems to work out pretty well since with the free constraint the shaft is still constrained to the ends of the slot.
  
  Can a gear mate be added with the slot mate so there's pinion rotation too?
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  - Dennis Bacon @ Kevin Chandler on May 19, 2018 10:05 PM
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    Hi Kevin
    I take it you aren't (weren't) in front of SW to test it and I'm by no means an expert on gear mates but it appears that the gear mate is very simplistic (using a ratio) and I found no problems rotating the "halo" with the "shaft" rotating from one end of the slot to the other without breaking anything.
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    - Kevin Chandler @ Dennis Bacon on May 20, 2018 7:42 PM
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      Dennis Bacon wrote:
      
      Hi Kevin
      I take it you aren't (weren't) in front of SW to test it and I'm by no means an expert on gear mates but it appears that the gear mate is very simplistic (using a ratio) and I found no problems rotating the "halo" with the "shaft" rotating from one end of the slot to the other without breaking anything.
      No Dennis, I wasn't at SW. I didn't think they'd be any issues, but I've thought that before and...
      Thanks for filling me in so I don't have to on Monday.
      
      Cheers,
      
      Kevin
      
      EDIT: I understood the gear mate to be just a ratio input, but unless I can test it myself, I type the reply as a suggestion.
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  - Asko Kauppi @ Kevin Chandler on May 20, 2018 10:51 AM
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    Hi Kevin,
    my original model didn't have a gear mate, but I'll likely add one once the whole larger assembly starts to be alive.
    Did you mean SolidWorks should do such as part of the slot mate? I see the temptation but think that keeping things simple for designers is also great. Personally, I'm fine doing a gear mate separately.
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    - Kevin Chandler @ Asko Kauppi on May 20, 2018 7:39 PM
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      Asko Kauppi wrote:
      
      Hi Kevin,
      my original model didn't have a gear mate, but I'll likely add one once the whole larger assembly starts to be alive.
      Did you mean SolidWorks should do such as part of the slot mate? I see the temptation but think that keeping things simple for designers is also great. Personally, I'm fine doing a gear mate separately.
      Hello,
      
      I meant adding a gear mate in addition to the slot mate.
      The slot mate is required as others have detailed above.
      I mentioned the gear mate to extend the functionality of the assembly because there's another pinion on the shaft and as the upper pinion follows the arc slot it rotates the part per the gear ratio.
      
      I don't agree on the "simplicity". I'd modle it to the required intent and budget.
      
      Cheers,
      
      Kevin
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Unable to do a slot mate when teeth have been added to the slot

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