I think I set a record today for the most hours spent for a part so small. It is the same diameter as a quarter. I must have spent a total of 5 hours. Most of that time was spent configuring my lathe tool table again, and again. But I found the problem that has been causing me so much grief. I was using a .004" feeler gauge for setting my tool positions. Today I noticed something funny about it and looked closer and found a .005" feeler gauge stuck to the back of the .004". So all this time my setting have been off by .01" (twice the .005"). With all my prior pieces I was having a heck of a time getting the dimensions to come out correct. I kept adjusting my tool table. Now, after making the tool table adjustments again with the proper value, my part came out +.001" on the first try.
Another problem I had was I broke my parting tool with a rapid. I have been having trouble fining a parting tool that works with my 3/8" tooling the CHNC requires. I decided to ground down a 1/2" blade that was .0625" too tall. That took about another hour to get it right. In the end it worked well.
The part in the picture is the Crank Disk. It has a 0-80 thread tapped in the small hole. It required a .020" slot across the flange to allow a press fit. I did not have anything that small that I could machine so I cut it by hand with a .015" wide jewelers saw. I made it through without breaking the blade. The time spent on the part included programming. For the first time I used a G96 (constant surface speed) with a G95 (feed per revolution). It worked out very well and cut the time machining the part in half. I won't go into the first attempt I made that I had to scrap because I read the dimensions wrong.
Yesterday I made another connecting rod end that looks very much like the one shown previously.
Vince