Rotary project, maybe????

[claudef]

    Rick... Thanks for all the feedback.
c-bore on threaded holes, I have seen this many years ago, mainly on machine tooling, MOORE Jig Grinders if I remember correctly. I have never seen this on American tooling. I prefer the chamfer, one shot deal, 6 lip cutter does not chatter and gives a beautiful finished look. (beauty is in the eye of the beholder)
Disengaging the dial weighs heavily on my mind, it's not difficult to do but it does involve a dial cartridge (module containing the bearings, shaft and dials) with an eccentric. I have been sketching options for the worm gear shaft with an adjustable dial and the more i look at it the better the cartridge sounds. In this case I may put the eccentric on and have the worm disengage.
I don’t want a vernier on my main RT (rotary table) I want an adjustable pointer for the degrees.
Now for the dial (you have to visualize the picture as a round dial), 9 degrees per turn (40-1 ratio) The bottom dial is graduated in degrees and 10 minute increments. The vernier breaks down the 10 minute graduations in 1 minute increments.

Now you have given me many Iterations of how I should graduate my dial and vernier and would like to consider these before I get to scribing but for the life of me I can’t follow what you are saying in words.. could you possibly sketch out something and post it.
By the way, the plan was to scribe the vernier line 0 to 9 in the following positions:
Line 0=0
Line 1= 59 minutes
Line 2=1 deg, 58 m
Line 3= 2 deg, 57
Line 4= 3 deg, 56
Line 5= 4 deg, 55
Line 6= 5 deg, 54
Line 7= 6 deg, 53
Line 8= 7 deg, 52
Line 9= 8 deg, 51