Using an accurate micrometer (not a caliper) that is of the range needed. 2 to 3" or 3 to 4' probably, measure 9 places on each journal. Start at the front of the crank, and make a spread sheet, or paper copy of the measurements. On each journal (rod and main) measure three places at the front of the journal at 120 degree separation. Then go to the middle of the journal and again measure 120 degrees apart. Then at the crank edge of each journal. These nine measurements give you taper of the journal and eccentricity (egg shapeness) write each measurement even if it matches the one before it. Be very touch sensitive when adjusting the micrometer. Assure it is flat front to back, and measuring directly across the diameter. Be sure to apply only enough pressure to just barely let it be stable and flat to the work. Practice measuring on the same piece of material (Like an old wrist pin) for 15 trys to make sure you are consistent. More than .ooo8 out of round (egg shape) and .0005 taper wil need to be ground. Jim
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Today's Featured Article - Grain Threshing in the Early 40's - by Pat Browning. The setting is rural Wisconsin, halfway between East Troy and Elkhorn, on Hodunk Road, our nation was at war, and I was 6, 7 and 8 years old. George was our "threshing neighbor." He was the one with the threshing machine, a JI Case on steel wheels, and he pulled it to our farm with a JI Case standard tractor also on steel. In those days, steel wheeled implements were common. The roads were general gravel, so the lugs cutting into them wasn't a problem. George would set up the thresher, s
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