The big picture:
I have found the the ways of doing the most accurate work involve avoiding measuring to the fullest extent possible. All the reasons why is really a separate discussion.
More details:
These setup bars enable you to confidently set bit-to-fence distances, with no need to make a measurement. That's probably #1 in my book. Need to route a 1/4" groove down the center of the edge of a 3/4" board? Just whip out the 1/4" setup bar and place your fence distance that way. Highly accurate and repeatable. The bars are brass so they don't nick your cutting edge.
They make it easy to check the depth of a groove as well. I drop the setup bar in the groove I cut in a piece of stock to get my bit height above the table dialed in exactly. When the bar exactly fits the groove in the scrap, I have my 1/4" and I zero the depth indicator at that setting. Now I can confidently route the groove in several passes, raising the bit until I'm back at the zero.
Set the bar on the table of your drill press and drop the quill till the point of your bit touches it to set up to drill blind holes at an accurate depth.
I even used mine to check the accuracy of my cheapy HF digital calipers. They were within spec.
Any time you want a known dimension, these come in really handy.
I have found the the ways of doing the most accurate work involve avoiding measuring to the fullest extent possible. All the reasons why is really a separate discussion.
More details:
These setup bars enable you to confidently set bit-to-fence distances, with no need to make a measurement. That's probably #1 in my book. Need to route a 1/4" groove down the center of the edge of a 3/4" board? Just whip out the 1/4" setup bar and place your fence distance that way. Highly accurate and repeatable. The bars are brass so they don't nick your cutting edge.
They make it easy to check the depth of a groove as well. I drop the setup bar in the groove I cut in a piece of stock to get my bit height above the table dialed in exactly. When the bar exactly fits the groove in the scrap, I have my 1/4" and I zero the depth indicator at that setting. Now I can confidently route the groove in several passes, raising the bit until I'm back at the zero.
Set the bar on the table of your drill press and drop the quill till the point of your bit touches it to set up to drill blind holes at an accurate depth.
I even used mine to check the accuracy of my cheapy HF digital calipers. They were within spec.
Any time you want a known dimension, these come in really handy.




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