Bannister back chair – getting to the center of things


After cutting the rear post from the stock, it became clear that we were dealing with a little bit of warp. We determined the position of the “centers” of the cylindrical section to be turned, prior to attaching the counterweight.  The illustration above shows the centers on one plane (the next centers were marked on the adjacent plane or 90 degrees from the first).  Then the lines were projected to find the “true” centers.

The first task was to create a “roller path” for the wheels of the steady rest to ride on.  This needs to be done carefully, as significant deflection will be encountered.  After the steady rest was mounted, we found that deflection was nearly eliminated.  The “working length” of the workpiece was shortened from 41″ to 24″, stiffening it considerably.  Our effective diameter is approximately 8″.  (Several posts back I indicated that the effective diameter was 16″.  My mistake.  Old age setting in…)  So we’ll be turning the details at approximately 1000 rpm.  Note that we’ve attached the counterweights with screws, backed up by several layers of duct tape, just in case…

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