Digitising Probe

[Leadhead]

m-c - Thanks for info.
I actually found an old one of that type which I had abandoned due to eccentricity some years ago. It has three small screws on the 8mm shaft side to fix it to the main body. There are similarly three small screws on the internal tri pivot plate. Would you know please which should be used to re-calibrate the probe spindle. Both are effective and both a p.i.a to adjust if truing in a chuck. I managed to get it to about .004" runout but not convinced it will stay there.

As an aside I may use the above for Z digitising and revert to "semi solid" probe for edges. By semi solid, I have been experimenting with an old rotary edge finder, the eccentric sprung head type. -- Beginning by trueing the end in the moving m/c collet chuck by eye. Stop and connect the circuit with a crocodile clip. Then perform the edge finding routine. This can be done more safely since the sprung rod end can give some radial movement if required. (Assuming of course one keeps the split line of the sprung head above the top surface of the plate being measured.) Have adjusted the spring to maximum tension and the approach speed low.
Still playing with this, but early signs look cautiously promising.