Sam reads the measuring devise as he lines the middle eccentric up with the boring head. The rig looks more like a 21st century robot arm that's been attached to a 19th century drilling head."This machine is not the daintiest thing to run," said Sam Thompson.
He struggled to line the middle eccentric up with the boring head. Sam's main concern was to line the eccentric on vertical and horizontal planes, or pitch and yawl, as he calls it. Otherwise, the eccentric won't line up properly with the crankshaft, said Sam.
His goal is to shave about one and one-half hundredths of an inch from the interior bore on the middle eccentric. Sam finished the job today. The test comes next Saturday when he re-fits the eccentric onto the crankshaft.
Sam used a series of shims and wedges -- "whatever I could find" -- to line the eccentric up with the boring head.
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