Basic Segmenting Overview - Don Lemandonleman.com/files/basic_segmenting.pdf · Segmented turning:...
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Transcript of Basic Segmenting Overview - Don Lemandonleman.com/files/basic_segmenting.pdf · Segmented turning:...
2. Now, how long do you cut each segment?
Original materials © 2008-2014. Don Leman, donleman.com Reprints available for download from donleman.com/segmenting
12 segments15o cuts
The length of each segment
determines the diameter of the
ring. Longer segments yield
a larger diameter ring.
1. Lay out a plan and design the piece first! You must decide the basics before cutting ... the number of segments, number of rings, and the diameter of each ring … height, diameter, shape, etc. Pictured right is an example.
You can accomplish this profile with pen, ruler, and graph paper or one of the available computer programs on the market today. segmentedwoodturners.org is hosting its biannual symposium in San Antonio TX in Oct 2014. Two computer programs will be presented in depth. Download a symposium brochure - donleman.com/press/2014_symposium.pdf - for more information.
BooksHampton, Ron. (2003). Segmented turning: A complete
guide. East Sussex, England: Guild of Master Craftsman Publications.
Nish, Dale. (2004). Woodturning with Ray Allen: A master’s designs & techniques for segmented bowls & vessels. East Petersburg PA: Fox Chapel Publishing.
Tibbetts, Malcolm. (2005). The art of segmented woodturning: A step-by-step guide. Fresno CA: Linden
Recommended ResourcesPublishing.
Open Segmenting ... Smith, William. (2002). Segmented wood turning. Atglen PA: Schiffer Publishing.
Software• Woodturner Pro, available from woodturnerpro.com• Lamination Pro, available from woodturnerpro.com• Segmented Project Planner, available from
verifiedsoftware.com
Ring 1
Ring 2
Ring 3
Ring 4
Ring 5
Ring 6
Ring 7Ring 8
Credit - Tibbetts, p. 69
Credit - Hampton, p. 17
Page 1
Basic Segmenting Overview
Let’s run through a few examples:• You want an 18-segment ring that is 11” in diameter ... .17632 x 11” = 1.93952” length (miter angle 10o)• You want a 12-segment ring that is 10” in diameter ... .26795 x 10” = 2.6795” length (miter angle 15o)• You want a 16-segment ring that is 18” in diameter ... .19891 x 18” = 3.58038” length (miter angle 11.25o)
# of Segments
MiterAngle °
Tangent J
# of Segments
MiterAngle °
Tangent J
6 30 0.57735 24 7.5 0.13165
8 22.5 0.41421 26 6.923 0.12142
10 18 0.32492 28 6.428 0.11267
12 15 0.26795 30 6 0.10510
14 12.857 0.22824 32 5.625 0.09849
16 11.25 0.19891 34 5.294 0.09266
18 10 0.17632 36 5 0.08749
20 9 0.15838 38 4.737 0.08286
22 8.182 0.14378 40 4.5 0.07870
tangent x diameter = segment length
Method #1 Credit - Tibbetts, p. 67 Method #2 Credit - Hampton, p. 12
3. Make the width deep enough, based on your drawing, to have room to turn the inside and outside of your piece. Refer to the graphics on page 1.
a. diameter x pi (use 3.1416 for pi) = circumference ÷ by the number of segments = segment length
b. 360° divided by twice the number of segments (because each segment has two sides) = miter angle
Let’s run through a few examples:• You want an 18-segment ring that is 11” in diameter ... 11” diameter x 3.1416 = 34.5576” circumference ÷ 18
segments = 1.91986” length. 360° ÷ (18x2) = 10° miter angle.
• You want a 12-segment ring that is 10” diameter ... 10” diameter x 3.1416 = 31.416” circumference ÷ 12
segments = 2.618” length. 360° ÷ (12x2) = 15° miter angle.
• You want a 16-segment ring that is 18” in diameter ... 18” diameter x 3.1416 = 56.5488” circumference ÷ 16
segments = 3.5343” length. 360° ÷ (16x2) = 11.25° miter angle.
Want to do a Feature Ring ... something that possibly could fit into Ring 5 similar to that shown on page 1?
Here is just one of many possibilities. Make two sets with contrasting woods, such as maple-mahogany and maple-bloodwood. To finish - (1) Cut each segment to the desired miter angle. (2) When inserting feature ring into project, ring the maple-mahogany set with mahogany and the maple-bloodwood set with bloodwood to complete the illusion.
Credit - Nish, p. 132Page 2