EKretz, you are exactly right. I just asked for the one geometry question. And it got twisted into this. But that's ok I guess. The more questions asked the more for myself and others to learn from. Except the fact that there is So much BS to sift through.
I am NOT a professional scraper, as I'm sure many on here are as well. I Am Always learning. And yes I did make a few mistakes already in my process. I started out with the saddle sitting on 3 points on my 5' x 2.5' surface plate. It did not leave me much room to work around the outside with my indicator stand. But what I found was the saddle was bowed. It was about a .001-.002 high on the ends "long ways" and low in the center. I did check for twist from side to side. My 1st mistake was. I did not check for twist or parallelism in each individual way the short 3" distance. My 2nd mistake was setting it on wood blocks. I did scrape the side that has the .0015 taper in it, while sitting on the wood blocks. It wasnt until I was using that side to indicate parallelism to the other side, that i noticed a problem. So that's when i decided i better make a 3 point stand for it so i could use my precision level as well. And to take out any unseen stresses.
Yes i also miked the underside of ways every 4" all the way around. So using 3 different methods after getting it on 3 point.
1st. Check was My indicator stand Set on 1st scraped side and indicated across to other side. As I slid it tword and from the other way " not long ways "I saw a differance in the reading.
So 2nd. I set my 4ft parallel across the 2 ways and a flash light on the back side and I could see the one way. The first one I scrapped. Was angled. I also confirmed this by sliding a piece of shim stock under the parallel.
3rd. My level set long ways and also 90deg short ways on each way and moved every 4". I was able to see the way was not parallel to the other way" short distance as in picture drawn above" And also each individual way was twisted as well.
I have got the second way scrapped and parallel in both planes. Now I am going back to the first way to correct my mistake. Because it is not only out of parallel. But it is also slightly twisted.
I hope this clears some things up. Again, THANK YOU guys for your help and knowledge!!