I'm not self centered chuck

[irving2008]

George, a DTI is a fundamental piece of equipment for aligning things. I dont know how to manage without one. I suppose it will depend on your need for accuracy... a ruler will give you +/- 0.5mm... I'm normally working to +/-0.1mm or better. That youtube vid shows the same technique I use... takes only a couple of minutes to get it lined up...

Here's a pic of something more complex... here I DTI'd on the central bore to get it centred within 0.01mm... it was a tight fit on the minilathe, there was about 5mm clearance to the bed...