It seems to work. I got a calibration of 2562 on X and 2563 on Y, and with those numbers I hit the same measurement as the micrometer in thousandths on a 6.000" span.
The 123 blocks were great because I could arrange them to check measurements of 5.000, 4.000 and 3.000 inches as well as 6.000, showing me that linearity was good as well. And repeatability was also perfect with lots of measurements and traverses always returning to an agreed zero with the DTI, as well as repeated setups again to earlier measurements.
You can actually calibrate lines per inch to two decimal places using this DRO software -- I just stuck with whole numbers. I feel like I'm in my "close-enough" comfort zone now, and I'd need a bigger micrometer, more blocks, etc. to go finer
The general 2500+ lines per inch of these scales mean a resolution of a little under 4 tenths, so the nearest thou is really a matter of practicality, and I've limited the display to 3 decimal places. That's also adjustable.
If anyone is interested in this kind of interface, there is a prebuilt version of the interface board (the software is free) -- it's called TouchDRO .
Well, back to the Bluetooth DRO thread, and on with the mounting of the Z axis scale......
Thank you Andrew, again...
![:beer:](https://madmodder.net/Smileys/default/anim_32.gif)