I am going to take a stab at a segmented bowl. When gluing together the
"rings" of segments, how does one ensure that the rings remain centered
around the axis rotation for the glue block? It would seem to be that if
done by eye it would be OK for a layer or three but any error could
accumulate. If there a trick or technique for keeping the stacked rings
concentric?

Thanks,

Steve

On Jul 24, 5:57 am, "StephenM" wrote:
I am going to take a stab at a segmented bowl. When gluing together the
"rings" of segments, how does one ensure that the rings remain centered
around the axis rotation for the glue block? It would seem to be that if
done by eye it would be OK for a layer or three but any error could
accumulate. If there a trick or technique for keeping the stacked rings
concentric?

Thanks,

Steve

I usually scribe a pencil mark as close to the next ring's inner
diameter as possible. The trouble is, when clamping, glue squeeze-out
obliterates my ability to see the mark. Maybe err on the side of
caution, and make the rings slightly oversized? Tom

In article ,
"StephenM" wrote:

I am going to take a stab at a segmented bowl. When gluing together the
"rings" of segments, how does one ensure that the rings remain centered
around the axis rotation for the glue block? It would seem to be that if
done by eye it would be OK for a layer or three but any error could
accumulate. If there a trick or technique for keeping the stacked rings
concentric?

Well, only doing a layer at a time helps.

Using the same inside or outside diameter for rings (and wasting wood as
a result) helps. If you were setting up "production" you might waste
less wood with a clamp jig. For a one-off that needs to be precisely
aligned, you could set a few "long" segments in the rings, so that
either the inside (use a pin at center) or the outside could be
registered without wasting a lot of wood.

Depending on the particular effect you are after with your segment
patterns, slight errors may not be noticeable - or they might be.

--
Cats, coffee, chocolate...vices to live by

On Fri, 24 Jul 2009 08:57:43 -0400, "StephenM"
wrote:

I am going to take a stab at a segmented bowl. When gluing together the
"rings" of segments, how does one ensure that the rings remain centered
around the axis rotation for the glue block? It would seem to be that if
done by eye it would be OK for a layer or three but any error could
accumulate. If there a trick or technique for keeping the stacked rings
concentric?

Thanks,

Steve

My guess from seeing pictures of my brother's work is that your build a simple
jig...

His site is up now if you want to ask him...
thesegmentedturner.com

He's explained the process to me several times, but it always seemed way to
precision for me and I sort of zoned out.. lol


mac

Please remove splinters before emailing

StephenM wrote:
I am going to take a stab at a segmented bowl. When gluing together the
"rings" of segments, how does one ensure that the rings remain centered
around the axis rotation for the glue block? It would seem to be that if
done by eye it would be OK for a layer or three but any error could
accumulate. If there a trick or technique for keeping the stacked rings
concentric?

Pretty easy actually. First, cut some little 1/4" cubes. Take your
first segment ring and lay it flat on the workbench. Position the 2nd
ring where you want it. Take some CA glue and apply a drop to one of
the little cubes then spray the bottom segment ring with some activator.
Put the cube w/glue on it in place. I usually use four cubes per ring,
placed at north, south, east and west. Be careful not to glue the rings
together w/the CA.

Now, take the top ring, slather it up w/your glue of choice and put it
back in the same position. The little cubes will keep it centered while
you clamp it. Being little pieces of wood, they turn off easily...

....Kevin
--
Kevin Miller - http://www.alaska.net/~atftb
Juneau, Alaska
In a recent survey, 7 out of 10 hard drives preferred Linux
Registered Linux User No: 307357, http://counter.li.org

I built a jig that has a small center hole and four lines radiating
from it at 90 degree angles. I made four slotted clips with notches
in them, which bolt onto those lines, so I can position the ring to
the lines and hold it in place. Then the tailstock goes in the center
hole to center it and press it against the existing rings while the
glue dries.

Steve:

You are correct to be concerned about accumulated error. I do a fair
bit of segmented work, and find that my optimum glue up is 4 rings (then
turn the inside shape and rough outside, true up the top face, then add
4 more, and so on. My largest pieces to date were a pair of urns that
stand 49 inches tall and about 24 inches in diameter. Needless to say,
it would be very difficult to hollow, sand and finish the interior if I
didn't do it a section at a time. With large vessels like this, I tend
to shape and sand the interior about 8 rings deep, staying about 4 rings
from the current "top". Once one gets more than 24" deep, I'll
typically add a finish (again, keeping the finished section reasonably
below the current top) so I only have to worry about final topcoats when
the whole thing is done. Outside can wait until the whole thing is done
before final sanding and finishing...

Thanks
--Rick

StephenM wrote:
I am going to take a stab at a segmented bowl. When gluing together the
"rings" of segments, how does one ensure that the rings remain centered
around the axis rotation for the glue block? It would seem to be that if
done by eye it would be OK for a layer or three but any error could
accumulate. If there a trick or technique for keeping the stacked rings
concentric?

Thanks,

Steve

I cut 12 seg. and use yellow glue,I use large dryer band clamps. When
you bring the bands tight tap the segs. down flat on a flat surface to
keep your rings flat. I bought a 36 grit sand paper sheet from one of
those big drum floor sanders.I stick the paper on my bench and flatten
each ring with that. Than I stack my rings on a board with an all thread
rod sticking up through the middle and line up the joints of my rings
when I get all the rings stacked I put a disc on top and a nut on the
rod and snug it down. Don't over tighten it , cause your rings might
slip.
Click on my ' wood working page below to see some of the bowls I made
this year so far. I got started in January and can't stop.

Jerry


http://community.webtv.net/awoodbutc...oodWorkingPage



http://community.webtv.net/awoodbutcher/1974RuppCentair

On Jul 24, 4:05*pm, Kevin Miller wrote:
StephenM wrote:
I am going to take a stab at a segmented bowl. When gluing together the
"rings" of segments, how does one ensure that the rings remain centered
around the axis rotation for the glue block? It would seem to be that if
done by eye it would be OK for a layer or three but any error could
accumulate. If there a trick or technique for keeping the stacked rings
concentric?

Pretty easy actually. *First, cut some little 1/4" cubes. *Take your
first segment ring and lay it flat on the workbench. *Position the 2nd
ring where you want it. *Take some CA glue and apply a drop to one of
the little cubes then spray the bottom segment ring with some activator.
*Put the cube w/glue on it in place. *I usually use four cubes per ring,
placed at north, south, east and west. *Be careful not to glue the rings
together w/the CA.

Now, take the top ring, slather it up w/your glue of choice and put it
back in the same position. *The little cubes will keep it centered while
you clamp it. *Being little pieces of wood, they turn off easily...

...Kevin
--
Kevin Miller -http://www.alaska.net/~atftb
Juneau, Alaska
In a recent survey, 7 out of 10 hard drives preferred Linux
Registered Linux User No: 307357,http://counter.li.org

Another similar method i use is to cut up icecream sticks from a craft
store and after aligning the ring, glueing them on to the lower ring
with a hot glue gun. You still have to be careful not to get any glue
on the new ring, but it works great. If the ring sizes are close, glue
two of the sticks in a T shape and use those for the alignment. I
learned that in a class i recently took.

Mike