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Best way to make a plug

Question asked by Andrew Kronquist on Apr 15, 2014
Latest reply on May 5, 2014 by Jerry Steiger

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I am trying to make a mold for a temporary rubber plug, And I'm not sure the best way to do it. I need to be able to make it either larger or small than the feature I'm modeling it from. I got it working, then it broke, then I got it working, but then I find it's not really right. I modeled the plug thinking I could put it in a cube then combine/subtract, which worked pretty good actually.

What we want to do is 3D print molds for these plugs. It's the darned "spigot" on this thing that's making it hard for me to figure out. My best guess right now it to make it size on size, and just scale it on the printer software, which I don't think is right.

Tom dunn Apr 15, 2014 4:20 PM

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I think the way I would make the plug would be to open a new assembly, insert your part, then start a new part and offset the surfaces at a distance of zero. create a new solid from the offset surfaces and done. Your new part will be same as the void and if you change the void or hole the plug will update the size accordingly. Tom

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Tom dunn Apr 15, 2014 4:20 PM

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Andrew Kronquist @ Tom dunn on Apr 16, 2014 8:42 AM

I'm sure this is the correct answer so I'll mark it, but I don't know enough about surfacing to be successful right now. I only got this far:

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Jerry Steiger @ Andrew Kronquist on May 5, 2014 12:13 PM

Andrew,

You will need to Untrim or Extend the edges of your surfaces so that they extend through the outer surface. Then use the Mutual Trim option of the Trim tool to make a closed surface. Once you have a closed surface you can Thicken to get a solid.

If you decide that you need to make the part larger or smaller you can edit the Offset Surface to get the right interference or clearance.

Be aware that when you roll back in the tree and make changes that the Trim is liable to break. This is usually because the selection of the bits to be kept or thrown away depends on where you pick on screen. As the underlying surface moves with the changes, the pick point may switch between inside and outside.

Jerry S.

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Tom dunn Apr 15, 2014 4:20 PM
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I think the way I would make the plug would be to open a new assembly, insert your part, then start a new part and offset the surfaces at a distance of zero. create a new solid from the offset surfaces and done. Your new part will be same as the void and if you change the void or hole the plug will update the size accordingly. Tom
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- Andrew Kronquist @ Tom dunn on Apr 16, 2014 8:42 AM
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  I'm sure this is the correct answer so I'll mark it, but I don't know enough about surfacing to be successful right now. I only got this far:
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  - Jerry Steiger @ Andrew Kronquist on May 5, 2014 12:13 PM
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    Andrew,
    
    You will need to Untrim or Extend the edges of your surfaces so that they extend through the outer surface. Then use the Mutual Trim option of the Trim tool to make a closed surface. Once you have a closed surface you can Thicken to get a solid.
    
    If you decide that you need to make the part larger or smaller you can edit the Offset Surface to get the right interference or clearance.
    
    Be aware that when you roll back in the tree and make changes that the Trim is liable to break. This is usually because the selection of the bits to be kept or thrown away depends on where you pick on screen. As the underlying surface moves with the changes, the pick point may switch between inside and outside.
    
    Jerry S.
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