Segmented Turnings
September 24, 2006
Entry Details
 

# 396
Glenn Marceil
Winston Salem, NC
Dimensions (inches):  
  Width:   10
  Height:   9
  Depth:   10
Materials:   Curly Maple & Walnut
ArmRSeal Gloss finish
                                                                  "Shocking Southwest"
                                     
As segmented turners we turn round objects that have smooth flowing, hopefully pleasing shapes & yet it's difficult to avoid the fact that sometimes they have the look of stacked bricks.This led me to explore the compound stave technique.It is more difficult but has some advantages over traditional segmented turning in the way the boards grain is presented.One disadvantage is its limitations in design-shape must be within the thickness of the board, but the southwest style is the perfect choice for this.After making several of these I wanted this piece to contain some really different design features.
 
                                                                   Design Goals
1.Overall theme of electricity
2.Lightning bolts in the middle of segments are voids (holes) - 6 in top, 6 in bottom offset
3.Cut continuous sine wave in center band
4.Compound stave construction to expose curly maple grain which seems to have a life
   of its own
5.Run all grain horizontal & radial (base & top are 6 sided,main top & bottom are 12 sided,
   center band is 24 sided)
6.All pieces were cut so grain is continuous (boards were not flip-floped, this produces
   more waste, but shows the same side of board for a more homogenous finish)
7.Use high gloss finish to bring out curl of the maple -5 coats ArmRSeal gloss
 

Top View - showing 6 lightning bolts - one more can be seen in the opening which is from the bottom.
 

Close Up of Sine Wave in Center Ring

This was made with a device I made earlier in the year with gears to move a router with a 1/4" cove bit. 12 turns of an offset cam moves the router back & forth at the same time rotating the piece one revolution. I soon discovered, however, it was even more complicated which I traced to the fact that when what is tracing out the sine wave has width you cannot get a perfect sine wave on both sides of the cut - only one side (you'll have to take my word on this). What you see is a compromise after 2 revisions of the cam and some creative sanding!
 

Construction Detail

This picture shows my use of temporary glue blocks during assembly. Until the top &/or bottom were glued on and the center ring the segments with the lightning bolts are held in place with these glue blocks.
The lightning bolts were made by cutting all 6 segments on the table saw when they were still rectagles.I tilted the saw just enough so that one cut up to the center would cut on the right side of the center line at the bottom & end on the left side in the middle.I cut all 6 at once raising the saw a little at a time until I was just past the middle.I put a spacer in this saw cut,taped the block together with masking tape, flipped the block & did the same thing on the opposite side until the 2 saw cuts met.When one end of this cut is held apart & the other is not you get a lightning bolt.
 

Judges Comments
JIm : The subtle zig-zag places this piece higher for me.
Malcolm : A pleasing shape, great-looking joinery, beautiful wood, a "different" style of creating the voids, and a uniquely "carved" feature ring make this "themed" piece quite original. The unfortunate bulge in the base ring profile is a minor flaw in the overall shape.
Mark : Unique. I like most all of it. Overall shape, wood selection, finish. This would be much better w/o the bulge at the foot, and what appears to be a bulge at the neck.

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