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I learned from some scraping hands
What are you using for a master?.....and do you need to borrow any?
And don't forget, metrology will be a hefty investment!
OK, today I got 2 hours in the shop and decided to continue a tad on the lathe... So I did six rounds on the lower bearing ways of the cross slide, and got to thisMarking is done with minimal dye on the tombstone... and when its day you can "mark" without dye at all, by giving the ways a wipe with ethanol, let them dry, and the touch the part on the tombstone. I recall reading about this in Connelly... I was surprised to see that in daylight, it really works... After the baby goes to bed I may have some time to check parallelism with the upper surface... It was within 0.0002" over the length of the ways last time in any direction, and I would not expect it to have worsened much if at all by now... Dave, Nick or others who know what they do... Some questions...1. Connelly, I gather, wants me to attain 15-20 points per square inch, because these ways will be the template for the mating (upper side) ways on the saddle... I would say I may have gotten near the lower point (I do not show my 1 inch window in the photo... for reference, the narrow surface is a bit over half an inch...)2. Would you say that the bearing is homogeneous? It appears that the points are not entirely evenly scattered, but this is a matter of opinion(*). I am tempted to call this bearing quality OK, but I fear this is optimistic. tom (*) I could measure the distribution by digitizing locations of points and doing a Kolmogorov-Smirnov test against what I would get from a uniform distribution in each direction ... but let's see what you think first...