This is the meter I used, 100uA-0-100uA.
http://www.andersmeters.com/shop.php?p=search_results&search_terms=CV18XCZ100UAS+
Here is a vid of it in action.
In the video I am spinning the chuck (250mm/10Inch Dia) to 2000rpm pause for 2 seconds then to zero pause again then to 2000 reverse and then again back to zero.
As you can see the meter shows almost 150% load whilst accelerating but settles when at speed then when stopping there is approx a 100% load in the opposite direction, then vice versa with the reverse.
http://youtu.be/lZ7asQ2PBGQI was at one point going to input the analogue signal to Mach for doing things such as detecting tool wear but the issue I had was the +/-10v signal. I used a rectifier so that it was always 0-10v but of course that introduced a 1.4 or so voltage drop, I then messed around with an opamp circuit to try and redress the drop but in the end I got bored and just shoved on the analogue meter
Hood