- Nov 23, 2018
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Notice that when some book recommends placing the blade ABOVE the center line, it is alwyas the old rocker style tool holder. I got rid of mine 30 years ago. I notice in the Philippines those rockers are still being used and still for sale.Several good replies above. I would add that anything you read in any book should be considered a place to start, from which you make adjustments to suit your context - machine, material, cutting tool, etc. I will say that I normally position my cutting tools on center, not above - this is on a well-worn Cincinnati TrayTop 12.5 x 30 lathe - a much heavier and more rigid lathe than the typical 9" Southbend, though the amount of wear can be a factor for both. The exception is my parting blade - I use a parting blade with a u-shaped top (which curls up the chip to allow better clearance). The trick with this type of blade is that the bottom of the U needs to be more or less on center, which means the top of the legs of the U will be above center.