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Quoteand that I have not spotted clumsily (i.e., i let the weight of the part be the only downward force (well, if I pushed down it would be very lightly), and I moved less than an inch in 2 directions...Oh-oh! Who told you this!?To properly develop the spotting pattern, the part hast to be moved. The finer the scraping, the more it has to be moved. You need to give the blue a chance to be wiped away from the peaks and to build the bull's eye.So place the part (that's how I do it) on the plate where no blue is, move it into the blue area and move it there in circles (so say figure 8, I don't do it so).Diameter of the circle maybe 10 cm (not really that important). Maybe something around 5 turns.No jerky moves, but smooth and gently. Grap the part so, that you don't tilt it. That means a bit below the center of gravity. That part is quite flat, so don't worry about that. Push it down a bit.Steamer already mentioned the rocking test.Sometimes, it is hard to hear wether it rocks, so here is a better way:Lay the part down, put a DI on top of one corner and try to rock it diagonally (over two opposing corners). Repeat at a second corner, but not one diagonal to the first one Nick
and that I have not spotted clumsily (i.e., i let the weight of the part be the only downward force (well, if I pushed down it would be very lightly), and I moved less than an inch in 2 directions...
Quoteand that I have not spotted clumsily (i.e., i let the weight of the part be the only downward force (well, if I pushed down it would be very lightly), and I moved less than an inch in 2 directions...Oh-oh! Who told you this!?
Wot Nick Said!.......
Now, it would be interesting (at least for you) how different the spotting is with both methods. Without scraping in between.Nick
Just a little scraping question. Can y'all scrape two pieces to the point that they will "wring" together like Gage blocks?