I placed the text manually along the arc to illustrate what I want to accomplish.
I was asking how would I place text along the arc as shown on the attached drawing (automatically)
I want the text to be place perendicular to the arc as show on the drawing.
Make the text and the underline to become a block and use this block to measure along the arc.
If they're not suppose to be equally spaced, make the text and the underline a block with its insertion point at the center of the arc and then use insert command.
If the text must be different for each instance, make it an attributed block. And follow patchy's advice by using "measure" command for equal distance spacing.
If you want to get fancy you can create an attributed dynamic block, with the center of arc as base. Then stretch and /or rotate for custom spacing which you could use on varying radii of different arcs.
And if the text is to go on radial tick marks (as in your example) add an alignment parameter to the dynamic block.
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