ART,
Three tests for your review. All tests are identical and reports attached for
each. All done with posted version from page 57- reply 568.
402 rpm @ 20 passes / .1p
Note that test #3 was stopped after pass #9.
Test#1
It was the last two passes that did a heavy cut and i just assumed it was 19 shown in the TEST#1 PIC.That was done wth the unaided eye. I KNEW THaT PASS #8 OR 9 WAS BAD AND THEN 10,11,12,13,14,15,16 AS A GROUP SEEMED OK. BUT THEN 17 & 18 WERE BAD. ( MAY BE OFF IN MY COUNT OF PASSES BUT THAT'S MY NOTES ).
TEST#2
Ths one was monitored under the microsope.
Pass 1 to 8 - looked right on as group
Pass 9 was bad and moved the lead to an increase over 1-8 scribe. As a group 10,11,12,13,14,15 followed in pass 9 scribe.
Pass 16 decreased the lead from from 9-15 scibedline.
Pass #17 inceased / moved the lead back to pass #9
Pass 18 and 19 moved the lead.
SO it oscilated back and forth ( i believe that is what happened in test #1 also ) All within the .0035" total lead error / two scribed lines.
I show all the above summarized in TEST#2 pic.
TEST#3
I figured i would try and catch the bad pass by itself and it looked like
#9.......Could be wrong. No pic but i d have an error report.
Under 40x and a side view you can barely see the .001" deep marks.
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I didn;t have a chance to compare the above visual descriptions to the reports but they should be close.
RICH