Frozen layers in Autocad
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Open the file ACA3-02.dwg. What is the distance between the 2 desks on the left?
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At first sight it appears that there appears to be only one column of desks on the left hand side. The reason for this is that there is additional data on a layer which has been frozen.Unfreeze any frozen layers to see the desks. Then use the distance command to measure the space bewteen them.
When you freeze a layer in Autocad it will be totally ignored and the working size of the drawing data will be smaller. This is often used to speed up drawing on large files, though not so much of an issue these days as we have more powerful computers.