Segmentation Basic 2

8/10/2019 Segmentation Basic 2

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Segmentation Basic

Bay Area Woodturners AssociationJan & Feb, 2010

David Vannier

[email protected]://www.westbaywoodturner.com/

In January We.

Did an overview of ProcessPicked A ShapeDiscussed Feature Rings and SelectedA Chain Pattern for our Feature Ring
mailto:[email protected]:[email protected]


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Now we need to divide thevessel into Rings

Start with the baseBases must be solid woodBurl is one way of minimizing woodmovement problemsSee Malcolms book for a floating base The thicker the base, the heavier thevesselMinimum thickness of the base isdetermined by making sure that theinside is turned into the solid base

Place a Thick base

SolidWoodBase


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Continue Placing Rings upto Feature Ring

SolidWoodBase

Ring 1

Ring 2

Ring 3Ring 41/8 T

Feature Ring

Now Work from Feature Ring toTop

SolidWoodBase

Ring 1

Ring 2

Ring 3Ring 41/8 T

Feature Ring

Ring 61/8 T

DuplicateRing 4

Ring 7

Ring 8Ring 9 - Top


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This Leaves The top ring as1/8 Thick

This is a little too thin for my tastesAdjust the top to thickShrink the rings belowEither equal Reduction or out of the

larger ring Larger is defined by surface area

In this case, I reduced Ring 8 by 1/8 to5/8 thick

Leaving Us With this design


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This is a good time to decide onwood types. I selected

Purple heart for the base & topStart & stop with the same wood

Cherry wood for Ring 1, 2, 3, 7, & 8Maple for Ring 4 & 6Bloodwood & Maple for the FeatureVeneer could be added between rings3 & 4, as well as rings 6 & 7

Next: Size the rings

Mark and Measure the largestdiameter for the outside of each ringMark and Measure the smallestdiameter for the inside of each ring


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Sizing the Rings

4

6

7

9

8

8

6 3

2

4

8

7 5

3

Now select the Number ofSegments/Ring. So How?

Long segments on small vessels dontlook as good, I shoot for less than 3 Large vessels can use large segments

Guesstimate Minimum number ofsegments = Max Vessel Diameter

In Our case, this is 9, or 9 Seg/Ring


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What are the options?Divide 180 by the number ofsegments to get the cutting angleMy segment options are:

2, 3, 4, 5, 6, 8, 9, 10, 12, 15, 18, 20,24, 30, 36, 40, 60, 72, 80, 90, 120, 180,360 per ringMy cutting sled works in degreeincrementsIf You Make Your Own sled or sanding jig(later), other options are possible

Rings that can be built inHalves are Easiest

Will explain when we discuss gluingthe segments into ringsDoing More than 24 segments perring can be tough to apply glue and

clamp before the glue driesWith this in mind, my options were

10, 12, 18, 20, or 24I picked 12 segments/ring


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3 Methods of determiningSegment Lengths

Option A Measuring off a graphExtremely accurate, requires make yourown graph

Option B Using a tableFast & Easy, Not the most accurate

Option C Using an excel spread

sheetProduces a printed cut sheet, requiressitting in front of a computer

12Sides

24Sides

Feature RingMax Diameter = 9


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1

12Sides

24Sides

ADD

Segment Length

12Sides

24Sides

Feature RingMin Inside Diameter = 8

Segment Length


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1

12Sides

24Sides


Segment Length

Minus

12Sides

24Sides


Segment Length

Minus

Segment Width


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Option B) Using The table

Read the Segment Length off a tableDont forget to add

Then measure the segment Width offour vessel drawingEstimate the length of board requiredto cut the segments by taking the

maximum diameter x 3.14 (PI) Andadding board to hold down (~6)

Using a Table: By Ken Horner

See separate file: From MoreWoodworkers by Ken Horner.pdf
http://localhost/var/www/apps/From%20More%20Woodworkers%20by%20Ken%20Horner.docxhttp://localhost/var/www/apps/From%20More%20Woodworkers%20by%20Ken%20Horner.docx


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Determining the Widths

Ring 1 Width

Ring 2

Width

Option C) My Excel SpreadSheet

Enter# of segments/ringRing ThicknessOR Largest Outside Radius (= diameter)IR Smallest Inside Radius (= diameter)

Guardband are preset to Ive used 1/8

Segment Lengths and Widths are calculatedBL = Board Length. Note this does NOT includeextra wood to hold on to
http://localhost/var/www/apps/club%20project%20jan%20feb%202010.xlshttp://localhost/var/www/apps/club%20project%20jan%20feb%202010.xlshttp://localhost/var/www/apps/club%20project%20jan%20feb%202010.xlshttp://localhost/var/www/apps/club%20project%20jan%20feb%202010.xls


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Feature Ring = 24 segments

For 12 segments, the segment is 29/16 long. Too long.Vertical spacers are Cut the Segment Lengths to 1

1 minus (spacer)

Cut 24 spacers, & 12 of each of the

chain piecesThis will be tough to glue!

How about CAD packages thatare available?

Ive found them cumbersome to enterthe shapeStuck with whatever assumptions thesoftware makes

Bottom line: Not worth the money inmy humble opinion


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So now we have a cut list

Next we need to prepare some woodThen we can

Cut the segmentsGlue the ringsBuild the vesselTurn the vessel

Board Sizes

Min Board Width = Segment WidthLarger is okDifferent widths in the same ring is alsook

Board Lengths can be approximatedby the circumference of the circle(diameter x PI)


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Cutting Segments

Table saw with a SledChop sawAny cutting method, followed byusing a disc sander

I use an Incra 5000 sled


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Making Your Own Sledhttp://www.turnedwood.com/framesled.html

Kevin Nelley

Jig for your Disc Sander

The Art of Segmented Woodturning by Malcolm Tibbetts


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Dry Fit Every Ring BeforeMaking Changes To Your Setup

I use hose clamps to hold thesegments togetherDont over tighten the clamps

We ARENT trying to FORCE the wood tofit!

Hold the ring up to a bright light,

checking each joint for lightKeep things clean!

If They Dont Fit

Either Cut AgainOR

Glue Up partial Rings & clean upbefore final gluing

ORTake to the disc sander and make the

segments fit


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Gluing Up A Perfect Ring

Apply glue to both sides of everyother pieceLightly rub joints to spread glueAs you tighten the clamp, holddown/press down the segments tomake sure they are flat

I use Melamine as a glue surfaceWax paper works as well

Gluing a ring that isnt perfect

Option A)Glue up in PairsThen pairs of pairs, etc until halves areglued

Make halves perfect, sander or sawOption B)

Use toothpicks to space halvesApply glue to all other surfaces & clampMake the halves perfect, sander or saw


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With the rings glued, flattenone surface

1. Use Hot Melt Glue to Tack the ring toa large faceplate

2. Turn the top surface flat3. Use a sanding stick to clean up and

make sure it is flatCole Jaws can be used for step 1

Drum sanders can be used, but watchout for snipe

Using The Flattening StickLightly Press HereWill Wobble Until At LeastPart of the ring is flat

Warning : If you press to the right ofcenter, the board will lift and snap backdown against the tool rest. You can pinchyou hand badly!


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Adding the Ring to the stackAlignment is Critical

Start by turning the pieces already gluedround. Not to shape, just round.Pick a seam on both rings and align theseseamsNow align the seams on the other side, 180degreesKeeping these two seams aligned, slide therings back an forth to align seams at 90degreesClamp in place

Step 1: Mark joints 180degrees apart

Ring to be added


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Step 2: Align these marks

Step 3: Mark & Align at 90degrees


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Step 4: Tack blocks to keeprings from slipping

Clamping can be done with

LatheDrill pressClampsJig


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Continue process until you havetwo halves

Pin the two halves together on thelathe

I use the Oneway tailstock with a hub

Turn the outside to shapeSeparate and turn the insides of thetwo halves

Glue two halves togetherPart top faceplate off

Finish turning & sanding insideand out

Only leaves the bottomI use a donut chuck to hold thevessel while I complete this

http://azwoodturners.org/DoughnutChuc

k.pdf by Art LiestmanWarren turns and finishes the bottomfirst, eliminating the need to do thisstep
http://azwoodturners.org/DoughnutChuck.pdfhttp://azwoodturners.org/DoughnutChuck.pdfhttp://azwoodturners.org/DoughnutChuck.pdfhttp://azwoodturners.org/DoughnutChuck.pdf


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As a minimum you need

To Make a Sanding stickMake a large face plate to flattenringsBand clampsAt least 2 face platesTable saw & sled or chop saw or bandsaw and disc sander with jigDry & square wood stock

Reference Books & Web Sites

http://www.turnedwood.com KevinNelleyWoodTurning with Ray Allen by DaleNish

The Art of Segmented Wood Turningby Malcolms Tibbetts
http://www.turnedwood.com/http://www.turnedwood.com/

Segmentation Basic 2

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