I have added a DRO to my Myford S7 which is a great asset, although the way I have installed the cross slide scale restricts the use of the top slide handle:
So I decided to make a smaller handle. The handle is held on a taper, so by turning the top slide until a DTI had zero movement when traversed along the taper, I knew that the top slide was set at the same angle:
As the taper is being measured quite a way from the pivot it is quite tricky to get a zero reading, and quite large angular movements are required to change the sense of the DTI movement..
A 6.5 mm hole was drilled through a piece of stock, followed by boring out the tapered hole using the top slide.
Not much metal has to be removed ? the opening in the taped hole is about 8.5mm
I was fortunate to have a spare screw to use as a gauge! In fact this showed I had bored too far - there needs to be a 2.7mm gap for the spring washer. I just skimmed the face to size.
Knurl, chamfer, part off, reverse to drill for the fixing screw. I finished with a 10mm end mill to give a flat bottom to the hole.
In position! I have to say it works perfectly. The original was in aluminium as a proof of concept.
This one is 25 mm dia steel, just slightly smaller than the adjustable collar.