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[QUOTE="Prospero, post: 1045569, member: 4970"]
I haven't done one lately but....

It's very tedious using a chopper. For a start you would have the cut the sections square and slightly oversize
and then shave the ends. Setting the angle is largely trial and error. Even if you use an accurate gauge there are
more faces to cut than on a square. Sixteen on an octagonal. That means any slight errors will get multiplied. As
as this you have to lash-up some sort of improvised length stop.
If you are doing a number of the same size/no. of sides it's not so bad as once you get the machine set you can
forge ahead. Doing one involves a bit of set-up time.

On a saw it's easier, especially if you have pre-set angle increments. Even then you can go way off. o_O

It's a wise move to calibrate the saw first and do a few test frames using spare timber or scrap moulding.

** If you are framing a bevelled mirror, make the frame first and then get the mirror to fit it. :D Don't ask.....:confused:
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Verification

"C.M.C." Stands for COMPUTERIZED _____________ CUTTER (one word answer)