How to rotate a drawing from a world grid to my local site grid?

[KevUK]

Perhaps you have not been on a construction site with the pressures.

eldon

I know all about the pressures on site!

The OP stated that when he ID a point. Quote "so when i pick points from the drawing using the ID command i recieve a long and meaningless coordinate which is useless to me when setting out." Unquote.

Perhaps you could explain to me what the OP means as meaningless!

With reference to your Quote " When the drawing has Ordnance Survey coordinates with six significant figures for metre units, and then the architects are using millimetre units and have left the precision on default (four decimal places), there might be thirteen digits for the Easting and thirteen digits for the Northing." Unquote.

To me personally and others, when we get into situations where we are talking about thirteen digit figurers these can be shortened.

Example:
E 555555444.8883 N 444123555.9992

to E444.888 N555.999

Don't get me wrong, I agree with you that it is easier and quicker to use your own local grid system. But as I have stressed before with the OP "What is meaningless about the co-ordinates". So why bother sending the CAD drawing to the site engineer!

I personally would set my site up allowing for expansion as well eldon, perhaps the extreme South Westerly corner being E100.000 N100.000

I see we also have another question on the same subject: http://www.cadtutor.net/forum/showth...al-grid-on-CAD
Is this the same OP!