Replies

1. 
   mike4244 | Mar 03, 2005 02:17am | #1

   I have done a lot of this , the distance from each edge is usually 1 1/4" to the outside edge of the flute. Now bear in mind this arbitrary as the width of the column and the flute width and reed width all have a factor in determining this measurement.

   The closer the flutes are together the better it looks, but accuracy is paramount when routing close flutes. For example, 4 flutes on a 8" column compared to 8 flutes means the reed is narrower with more flutes. If you have lets say 1" between flutes and you are off by 1/32 you won't notice it. If you have 1/8" reeds with 5/16" flutes and you are off the same amount, it will be very noticeable. 1/32" of 1/8" is 25%.

   Now there is a way to get dead accurate flutes and reeds if you choose to rout them close together. A plunge router would be best, can be done with regular router base but some burning at start and stop will happen.I 'm sure you will paint the posts so burning is irrevelant.

   After clamping the stock down ,fasten a stop block top and bottom, allowing for router base to stop where you want the flutes to end. I end the flutes1 1/4" above the base (if you use a base) and 1 1/4" below any top molding or capitol.

   Arrange a jig perpendicular  and square to the stock that will utilize a stop block for your router fence.After determining the centerline of the first flute, make a spacer block that goes between the routerbase and the perpendicular jig.Rout first flute, using straight edge on your router. Place spacer block between base and stop block. I use a toggle clamp on this to make it easier and faster. Loosen fence adjustment and push base up to stop block. Remove spacer and rout second flute. Repeat for each flute.Practice on a scrap piece first.

   I can do 8" column sides with about 9 flutes in oak in 5 minutes or less. Do not try to go fast, take your time and do it right. I only mentioned how long it takes me to explain that it is not difficult to rout flutes accurately and with some speed.

   mike

2. 
   UncleDunc | Mar 03, 2005 05:47am | #2

   >> I know there are certain proportions to adhere to ...

   Maybe. Maybe not. Here's one commercial source that shows a variety of proportions. I found it with a Google image search for "fluted pilasters".

   http://www.kempsvillebuilding.com/pg26.htm