I own a Unimat DB200 like this http://p2.la-img.com/385/24564/8915114_1_l.jpg
This lathe can be converted into a vertical drill (see the lever in the picture) using a lever to lower the drill.
This does not have a means of measuring the depth, so I would like to make a tool.
A simple idea I had, was to make a small cylinder-like part and pass the lever through it, attached with fasten screws. Eatch time the lever rotates, this part rotates with it. If a scale is marked onto the part, then it's rotation (and hence the depth) will be known.
What do you think of it?
Any other ideas?