This maybe an obvious question to someone but is there a quick way of marking the centre of a circle similar to drawing diagonals on a square or rectangle. Giff
I thought there maybe a way but couldn't work it out...really helpfull. I feel a bit like an apprentice on this site always asking basic questions! should have paid more attention in geometry...Giff
here's a small tool you can make which will find the centre of a circular item: (it works on a similar principle to Pete's above)
Cut an obtuse angle out of the "base" (I don't think this angle is critical), fit the straight marker so that it bisects this angle - this needs to be accurate.
You can make the tool as large or small as your needs dictate.
To use it - place on the outside of the circular workpiece, ensure the "base" is touching the workpiece in two places, mark a line, rotate it around the item and mark another line - where they cross is the centre of the circle.