Hi Richard,
Have you done much hand scraping? I've done a little myself when
working for others. I wouldn't call myself a journeyman but have
worked with many and through training and observation have , at least,
begun to develop a technique. Some get good rather quickly (not I) and
for others it takes a while. When someone first begins to learn
scraping it goes slowly because of the technique involved in the
sharpening component, the actual scraping and the extra care in
measurement. But an experienced scraping hand (which you become after
a while) goes through these small items very rapidly. Has your
experience been with a hand or power scraper?
When scraping a Bridgeport knee you don't move it much. You bring your
flats and straight edges to the piece which saves a lot of time.

dennis in nca.

Richard J Kinch Aug 1, 12:17 pm writes
rigger writes:
An
"experienced" scraper hand could easily do the horizontal knee surfaces
in less than a day (after the vertical surfaces of course) ,with the
proper tools.


Ten, count em, 10 surfaces to be scraped on that one axis alone. Flat,

bearing quality, aligned up/down, tilt fore/aft, tilt left/right, all
to
better than 0.001", with the concave wear something like 0.010 in the
extreme.

Assuming you disassembled, cleaned and shipped (both ways) out to an
expensive grind job, the hand scraping would still be days of work. If

you're removing the meat by scraping alone, then it is easily weeks of
backbreaking labor.