Denford Software & Machines

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 Post subject: sizes change when inverting model
PostPosted: Wed 03 Mar , 2010 13:37 pm 
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Joined: Sat 28 Oct , 2006 5:13 am
Posts: 7
Hi All
When using Quickcam Pro Ver 1.9.0.97 and opening an STL file the model size is shown
e.g. X=85 Y=125 Z=25
If I invert the model these sizes remain until I get to the "Set Cut Depth" screen... if I want to machine to the bottom of the model these sizes change to X=87 Y=127 Z=25. Why is this and how can I correct it???
many Thanks.... Snowand


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 Post subject: Re: sizes change when inverting model
PostPosted: Wed 03 Mar , 2010 15:10 pm 
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Joined: Fri 10 Feb , 2006 12:40 pm
Posts: 3573
Location: Sunny Brighouse Hardware/Software: Go to User Control Panel > Profile
Enter as much information about your CNC hardware and software as you can - it makes it easier for everyone to know what you're talking about then.
Without looking too deeply into it, I'm guessing that inverting the model is adding 1mm onto each side of the original.
This will be so that everything is preserved when the 3D shape is inverted and sliced...the software has to slice open the bottom of a model when inverting, as most models are fully-closed shapes.
Adding a small border gives the new inverted shape a top surface to work from.
The model itself should still be the same size when produced.


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