I marked both edges of the blade onto the wood, then coninued the move, stopping and marking both edges of the front and rear of the blade to both the leading and trailing edges of the board. First I squared the gauge face and scrap wood piece to the blade, created a group of the scrap board, gauge and bar and carefully slid the group, keeping the bar in the slot by keeping the move on the proper axis until the front edge of the blade contacted the leading edge of the wood. Using the model I tested both methods with the blade intentionally tilted 2 degrees out of parallel with the miter slot. While some are adept at working this type of thing out in their heads, I need visual representation and proof, so I created a SU model of a table saw table, blade, miter slot, miter gauge and even some scrap wood to test it out on. But for very long miter cuts on wide pieces of stock, any small amount of error will be magnified, so which method would give you the most accurate cut allowing for some minute error between the blade and the miter slot? In a perfect world, the blade of the saw would be set perfectly parallel to the miter slot and therefore either technique should work since they are indexed to each other. Some were argueing that one should set the gauge square to the blade, while others said the gauge should be set square to the bar on the gauge, and thus to the miter slot on the saw table. On one of the woodworking forums there was a discussion about the proper method of adjusting a miter gauge for getting square cuts on a table saw.
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