How to set the fence on a router table
(Bonner Springs, Kansas)
image of setup block
I am making a tool box out of 1/2 inch walnut and the plans call for a 3/16 inch grove on the inside of the box.
I am using a router table to do the grove. I have brass setup bars. Do I use the 1/4 inch bar to set the grove the correct distance from the outside edge of board to have the 3/16 inch router bit centered a 1/2 inch from the outside edge of the board?
I am 67 years old and have not attempted a woodworking project since
high school in 1966 and feel a little lost.
If I am thinking the same as you (see above drawing), then it sounds like you will have the bit centered 11/32" from the fence (set up block = 1/4" plus 1/2 the bit diameter).
I confess I never use measuring blocks because they never seem to be the size I need. In this case, if you want the groove centered 1/2" from the edge of the board, I think the easiest way would be to simply use a steel ruler, if you have one, to measure from the fence to the center of the bit to get your half inch. Then do a test cut on some scrap to make sure it is exactly where you want it. You may need to tap the fence forward or back a hair to get it perfect. You can also test the depth of cut in the same way.
I hope it works.
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