I found that making the mullions tricky. I used the CMT set
(link is for reference only)
To make the window sashes and mullions. The real tricky part had to
do with the vertical grain fir I used. Tearout was hard to control.
If and when I make any more windows, I'll use a different wood and more use
of backer boards when milling the mullions.
See the instruction sheet w/ the CMT window sash set.
Delta has an instruction sheet on producing windows and doors, etc.
Don't have the copy here for the part number but I suspect it's still
available if you ask.
I highly recommend the Delta sheet although it relies on a stub shaft
cutter to make the cope cut for the full-length tenon of a classical
Most router sets these days are designed only for the stub tenon which
looks ok but isn't nearly as strong as the full tenon.
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