For me the advantage of these kinds of bars is to move or offset an item an exact amount from a previously fixed position.
For example, mortising. Using either mortiser or a drill press that you follow with a chisel.
Say you want a mortise 1/2" wide with just a 1/4" mortising bit or a 1/4" drill bit.
I'd drill or mortise the first row using the fence.
Then I would slip my 1/4" aluminum 12" bar between the workpiece and the fence. This will instantly move the workpiece exactly 1/4" over without having to move the fence or fuss with any measurements and the resulting mortise will be exactly 1/2".
For example, mortising. Using either mortiser or a drill press that you follow with a chisel.
Say you want a mortise 1/2" wide with just a 1/4" mortising bit or a 1/4" drill bit.
I'd drill or mortise the first row using the fence.
Then I would slip my 1/4" aluminum 12" bar between the workpiece and the fence. This will instantly move the workpiece exactly 1/4" over without having to move the fence or fuss with any measurements and the resulting mortise will be exactly 1/2".
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