[00:56.190 --> 00:58.190] There's the center surface after the job.
Several tips hiding in that video. I don't have a pair of disc mike's so the 1" gauge block allows me to measure close to the shoulder. O-ring drive directly on the part is the best. Checking on the surface plate for dish in the face ground surface. Don't flip your part end for end if you're out for the utmost accuracy. variations in center alignment and geometry will invariably bite you in the butt if you are working to very low tir values. Since I adjusted my center setup in the vise to get it grinding parallel and 0 dish on the face grind. By moving the entire assembly directly to the sine plate I know the angle will be very close. 0.125" dowel pins held to the calipers with quake wax. Museums use this stuff to keep things stuck down so they don't fall over. That makes taking that gauge line dimension at 1/8 inch from the face a piece of cake. Notice the high polish center surface doesn't even show where the part was bearing. An extremely fine finish on one of the sliding surfaces can minimize wear in a clean and well lubricated system. And now for a gold tip since you made it this far. When face grinding with the side of the grinding wheel on ultra precise parts as far as TIR goes. Like grinding the base of a cylinder square. Make sure your wheel is dressed to cut freely with an extremely narrow band at the very OD of the wheel. After you have fed in and you dwell to spark out. Vary your work head RPM if you have the ability to get a finer crosshatch then leave it at the higher RPM. That was all just prep, here is the tip. When you back off the part do it EXTREMELY slowly first taking the backlash out of the slide then you will hear the wheel tickle diminish slowly as the flex in the whole system is slowly relieved until the wheel actually lifts off. When you just casually jump off the face you can see the step where you jumped off with electronic indicator. if you have an extremely free cutting wheel it will be minimal but most times there will be a step that is very easy to see if you don't follow that tip.
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