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A mandrel is a round steel rod that you slide the wood blank with the brass tube inserted onto. We have two sizes A & B.
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Berea Precision Pen Mandrel Shaft
A mandrel is a round steel rod that you slide the wood blank with the brass tube inserted onto. For the Berea Arbor System, two sizes are available - A & B.
The A mandrel (sometimes called a "7mm" mandrel) which is 0.247 +0 -0.002 inches in diameter and and other mandrel which has a larger diameter, the B mandrel. This is 0.291 +0 -0.002 inches in diameter. The B mandrel is used on some kits because the thicker diameter helps prevent whip while turning and allows for a much better result.This shaft will work with either of the Morse taper drivers, but only with the like size (A or B) bushings.
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