Hello, I am designing a simple solution to expand a commercial indenter apparatus (example: http://www.phase2plus.com/vickershardnesstesters/900-390.htm) to have the capacity for scratch testing procedures according to ASTM G171. To do this I need to add the capability for constant velocity lateral traveling for the stage which I plan to do with a simple stepper motor and drive belt attached to the x-axis micrometer. I also would likely to have the capability to measure lateral forces on the indenter stylus or stage due to this motion in order to measure a friction coefficient for the tested specimen. So far my only design idea for a lateral force transducer is an LVDT in series with a spring. However I don't think this is the best solution possible and I wouldn't know how to mount the LVDT to the stage/stylus properly to measure the lateral force accurately. Any suggestions or criticisms would be appreciated.