Replies

1. 
   SawdustSteve | Mar 28, 2005 09:56pm | #1

   Drew... we need more info... How many staves do you want to use to make up the column and how thick do the walls need to be? AND, is it going to support something or is it purely ornamental? You COULD make it from as few as 8 or 10 staves but the walls are going to be quite thick. More staves equal thinner wood needed.

   There are 'thin' (1/2" wall thickness) prefabed round columns available on the market. Do a google on 'Roberts Plywood' and check their site. They are located in New York, but can ship anywhere. SawdustSteve

1. 
   TINK | Mar 29, 2005 08:22pm | #9

   SawdustSteve Thanks for your infomation, needed 10" cylinder  It's great to be bach in touch with the knots group... Andy

2. 
   Sphere | Mar 28, 2005 10:25pm | #2

   I recently repaired 2 of those..12 staves (360* / 12 =30*) they were about 1" thick and 2 1/4" wide..just ball parking here.

   BTW they had a groove and rounded tongue so they aligned and could still mate at an angle.

   A real PITA to glue up with strap clamps and inner tubes. It takes a lot a hands.

    

   Spheramid Enterprises Architectural Woodworks

   "Sell your cleverness, Purchase Bewilderment"...Rumi

1. 
   Wilson | Mar 28, 2005 10:54pm | #4

   to aid glue up - lay out all of the slat outer face up on a flat surface. carefully align the pieces so common edge butts without a gap. using strapping tape (the plastic tape with the reinforcement strands), place strips about 18 inches apart. each strip crosses all the slats. If it does not effect finish appearance, use a staple gun and place one staple throught each strap into each slat. Carefully flip the attached slats over so can apply glue to the bevels- for a 10" circle it will be close to 32 inches wide so it might be heavy. The cylinder is now formed when you "roll up" the piece. The tape acts like a pivot point and keep the pieces from slipping. easier to do that explain in words

1. 
   Sphere | Mar 28, 2005 11:06pm | #6

   Done that many times, these were 10' long and tapered with an entasis to boot. Fluted. 

   Probly made pre 1900. And on top of all that, not all the staves were apart, some were just 3 still glued, some 2..and a lot of singles. Being as it was a repair, the flutes were already there, so no mix and match..LOL

   I have 2 more to do any week now..even larger.

   Pays the bills..but is a royal pain in the butt. 

   Spheramid Enterprises Architectural Woodworks

   "Sell your cleverness, Purchase Bewilderment"...Rumi

3. 
   UncleDunc | Mar 28, 2005 10:26pm | #3

   Here's a calculator. Enter the number of sides you want and 90 for the base angle.

   http://www.woodworkersguildofga.org/ShopHelpers/MiterCalculator.htm

   To derive the formula, divide 360 degrees by the number of sides to get the central angle of one of the sides. Subtract that from 180 and divide by 2 to get the bevel angle.

   (180 - (360 / number of sides)) / 2 = bevel

   Edit to add: That formula gives you the bevel angle measured from the face of the board. If you want the blade tilt angle instead, where vertical is 0 degrees, the forumula is

   (360 / number of sides) / 2 = tilt angle

   
   

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   Edited 3/28/2005 4:42 pm ET by Uncle Dunc

4. 
   AlanYoung | Mar 28, 2005 11:02pm | #5

   Hi Drew,

   Based on stock that is 1" thick my autocad/calculator comes up with this:

   Rip stock to 2" wide. Then bevel at 11.25 degrees each side. Should glue together very close to 10 inches. My autocad drawing says the actual width would be 1.9509 but the leaves the 10 "points" of the circle at 10" in diamter. The flat spots in between are some what shorter. So ripping to 2" should make a circle very close to 10"

   Alan

   
5. 
   Andrew | Mar 28, 2005 11:14pm | #7

   Lee Valley sells a special router bit called a birds mouth bit for doing this. check them out here http://www.leevalley.com/wood/page.aspx?c=1&p=45160&cat=1,46168

    

   Andrew

6. 
   TINK | Mar 29, 2005 08:10pm | #8

   This is great how fast & such a variety of answers to work with.... thank you one & all. will keep you posted as to my (OUR) success. Thank You  Andy        (cylinder)