Why does this not work...

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 From:  bigseb
4687.1 
Please see attached file. A small block with a thread in it. I want to trim the inside of the hole using the thread as the cutting tool but it will not work. Strangely though the thread can be cut by the blocks surface but not the other way round. Why is this?
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 From:  BurrMan
4687.2 In reply to 4687.1 
Hi bigseb,
Your shapes are "open surfaces". There is not a cut that can be made by that open screw thread ..
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 From:  bigseb
4687.3 In reply to 4687.2 
Ok... meaning? What do I do to fix? Surely there is a way?
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 From:  OSTexo
4687.4 
Hello,

Were you looking for something like this?

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 From:  bigseb
4687.5 In reply to 4687.4 
Sort of. I want to trim B with A, then trim C with B.
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 From:  OSTexo
4687.6 
Hello,

So something more like this?

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 From:  bigseb
4687.7 In reply to 4687.6 
Thanks. I got it to work though. Cheers anyway!
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 From:  SteveMacc (STEVEH)
4687.8 
In your model, the thread obeject is not joined properly. It has an open edge running as a spiral round the thread. If you redo the thread so that this doesn't happen, then slice of the ends with a trim, you can add planar ends to make a solid. This solid will then boolean from the block.
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