Hi Marksbug

Thank you for taking the time to view and the comments.

I take on board the collet would improve the accuracy but by such a small margin, my drill chuck runs out no more than a thou. The most important other thing to take in to consideration which I didn't mention on the video, is to ensure the head of the machine is clocked/trimmed to the table. If not this can lead to all kinds of alignment and accuracy problems when using the quill.

The piece of bar I use is a piece of 3" long 3/8" diameter HSS so if I bend or deflect that I am in all kinds of trouble . The indexing head is normally a lot closer to the tee slots when I setup but for clarity on the video I thought it was worth showing. The mill table and the base of the indexing head are spotlessly cleaned so it is no different in sliding a vice or or any other attachment over the bed. Not sure about hanging the indexing head from the chuck. The indexing head is very heavy and my dividing head is even heavier.

I am very interested in an air float table?

I thank you again and like I have said before "there is always more than one way" just have to find the best way which works for you.
The Home Engineer