![:(](https://madmodder.net/Smileys/default/sad.gif)
Well it kinda works...
To test it I set it up in the 4 jaw on my lathe so I could access the accuracy using the lathe's Sony DRO (good to a few microns)
I zeroed the dial then used the DRO's touch sensor to set the DRO to zero for the 'depth' (Z axis) test. Then wound the carriage in by 2.000mm (see test1.jpg) . The dial reading was about 50um short. This was not unexpected as I don't know how accurate the DTI is or how accurate my 45° tapers are, and absolute accuracy it is not too important for an edge detector.
Then I zeroed the DTI (at 2mm in) to test the XY plane using the cross-slide (see test1a.jog). I zeroed the cross-slide DRO just as the tool post hit the probe (couldn't get the touch sensor in a position to test this so there could be a small error) . Then moved the cross-slide in 2.000mm. This time the DTI read 80um short (meaning there is about 80um movement in the X+ direction, i.e towards the indicator, before the DTI moves) (pic test 2a.jpg).
I re-zeroed the DTI and tested it in the three other orientations (X-, Y+, Y-) see test2.jpg. It seemed reasonably consistent perhaps 20um out in the Y- direction (could be chucking run-out or a gravity effect?).
All of which makes me wonder if this is ever going to be accurate enough to be useful
![:doh:](https://madmodder.net/Smileys/default/doh-45.gif)
?????
There is only the tiniest play in the ball slide (I chose to bond the parts together this time instead of screwing them) and the fit of the other parts would be difficult for me to improve on, so I'm now not sure if I can get this to work
![:scratch:](https://madmodder.net/Smileys/default/icon_scratch.gif)