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denster · July 4, 2019, 04:53 PM

Actually the taper is an issue. With a set screw you have one tiny point bearing on the wedge. While this pressure is centered and is much better than having the wedge contact the inboard edge of the slot only and does provide equal distribution of force it is not as good or secure as 1/4 to 5/16 inch of solid metal in opposing incline planes. The set screw also tends to wear the wedge so it's good that it is adjustable. However with a properly seated arbor and properly fit wedge it is unlikely you will ever wear out a wedge to where it needs adjusting.

July 4, 2019, 04:53 PM	#5
denster Senior Member Join Date: April 24, 2010 Location: Ohio Posts: 581	Actually the taper is an issue. With a set screw you have one tiny point bearing on the wedge. While this pressure is centered and is much better than having the wedge contact the inboard edge of the slot only and does provide equal distribution of force it is not as good or secure as 1/4 to 5/16 inch of solid metal in opposing incline planes. The set screw also tends to wear the wedge so it's good that it is adjustable. However with a properly seated arbor and properly fit wedge it is unlikely you will ever wear out a wedge to where it needs adjusting.