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Segmented bowl

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Segmented bowl

Postby Andyp » 15 May 2017, 09:40

Chestnut & walnut. 4" x 1¾"

This has taken me weeks to finish. As you will see the walnut strips are not perfectly aligned due to cutting freehand on the band saw and the difficulties in clamping 1.5mm strips into a tight curve, the later ones I wetted and clamped between the cut pieces and left to dry which gave me far less resistance when clamping.

Image

Image

Image

I have some thinner 1mm veneers for the next one but as I cannot cut a 1mm kerf I know that this will affect the geometry somewhat so I will probably end up with straight lines.


edited to correct veneer thickness
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Re: Segmented bowl

Postby Rod » 15 May 2017, 10:00

Nice

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Re: Segmented bowl

Postby 9fingers » 15 May 2017, 10:01

Interesting effect Andy. Must be a mix of the bowl shape and the grain making the strips look irregular.
Maybe the bowl body could be of a virtually featureless timber to avoid this?

Certainly a hard-work approach with 12 cuts and glue-ups to do so I can see how it took the time.

Maybe CNC 3d router and coloured epoxy as an alternate approach?

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Re: Segmented bowl

Postby Doug » 15 May 2017, 10:07

Good effort Andy, intersecting segments are a bugger to do :eusa-clap:
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Re: Segmented bowl

Postby Malc2098 » 15 May 2017, 10:08

Nice.
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Re: Segmented bowl

Postby Andyp » 15 May 2017, 10:14

9fingers wrote:Interesting effect Andy. Must be a mix of the bowl shape and the grain making the strips look irregular.
Maybe the bowl body could be of a virtually featureless timber to avoid this?

Certainly a hard-work approach with 12 cuts and glue-ups to do so I can see how it took the time.

Maybe CNC 3d router and coloured epoxy as an alternate approach?

Bob


How many cuts Bob? Look more closely.
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Re: Segmented bowl

Postby Andyp » 15 May 2017, 10:19

Rod wrote:Nice
Rod


Thanks Rod.

Doug wrote:Good effort Andy, intersecting segments are a bugger to do :eusa-clap:


Thanks Doug. I might try again with a large blank so the curve is not so great and easier to cut. I have seen a number of jigs on youtube to aid circle cutting on the bandsaw which might also help the accuracy.

Malc2098 wrote:Nice.


Thanks Malc.

I have noticed that the problem with this sort of design is that as soon as something is put in the bowl the effect is lost.
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Re: Segmented bowl

Postby selectortone » 15 May 2017, 10:55

Wow... nice job. I did a vase with a very simple celtic knot a while ago - it took a lot of time and patience!
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Re: Segmented bowl

Postby 9fingers » 15 May 2017, 11:32

Andyp wrote:
9fingers wrote:Interesting effect Andy. Must be a mix of the bowl shape and the grain making the strips look irregular.
Maybe the bowl body could be of a virtually featureless timber to avoid this?

Certainly a hard-work approach with 12 cuts and glue-ups to do so I can see how it took the time.

Maybe CNC 3d router and coloured epoxy as an alternate approach?

Bob


How many cuts Bob? Look more closely.


DoH! That is one each for not looking properly today :lol: :lol:
Still a lot of operations to achieve the blank before starting to turn.

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Re: Segmented bowl

Postby Andyp » 15 May 2017, 12:20

selectortone wrote:Wow... nice job. I did a vase with a very simple celtic knot a while ago - it took a lot of time and patience!


Thanks Terry,
Celtic knots are fun aren't they. I've made a few. matching the infill to the kerf, accurate (repetitive) cutting and proper clamping are key
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Re: Segmented bowl

Postby Woodster » 15 May 2017, 22:14

Nicely done. Not sure I'd have the patience for a glue up like that! :D
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Re: Segmented bowl

Postby Andyp » 16 May 2017, 06:50

Woodster wrote:Nicely done. Not sure I'd have the patience for a glue up like that! :D


Thanks. There are only 6 cuts and once I had leaned to pre-form the walnut by wetting before attempting to force into those curves the glue ups were not to bad although waiting a day or two for the veneer to dry then another day or two for each glue up meant a long wait.
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Re: Segmented bowl

Postby Phil » 16 May 2017, 07:30

Very nice Andy 8-)
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Re: Segmented bowl

Postby Dalboy » 16 May 2017, 17:45

A good attempt Andy and I can imagine that you have learnt a few things on the journey The next one can only be better and I look forward to it. I think a shallower bowl would have shown it off much better.
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Re: Segmented bowl

Postby Woodbloke » 28 May 2017, 18:26

I can't visualise what the blank looked like before the spiny bit :? - Rob
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Re: Segmented bowl

Postby 9fingers » 28 May 2017, 18:54

Woodbloke wrote:I can't visualise what the blank looked like before the spiny bit :? - Rob

Not too much different from the plan view in the first two photos.
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Re: Segmented bowl

Postby Andyp » 28 May 2017, 19:00

Hi Rob, very easy to draw with a compass. Sorry I did not take a photo of the actual blank. I drew a circle on a square blank. Then used the same radius to draw the intersecting arcs like this.

Image

I then cut an arc then glued in the veneer. When dry I cut the next arc and repeated untill all done. Then knocked off the corners of the square blank and turned. I would have liked for the points of the flower to meet on the bowl edge. If you are going to try this remember the saw kerf has to be the same width as the veneer.
Also cutting the arcs on a square blank makes clamping a lot easier.
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Re: Segmented bowl

Postby Woodbloke » 28 May 2017, 21:53

Thanks Andy, that makes sense now - Rob
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Re: Segmented bowl

Postby 9fingers » 28 May 2017, 22:31

Andy,
I keep wondering what did you make the cuts with in order to achieve a 3mm kerf to match the veneers.

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Re: Segmented bowl

Postby Andyp » 29 May 2017, 06:20

9fingers wrote:Andy,
I keep wondering what did you make the cuts with in order to achieve a 3mm kerf to match the veneers.

Mystified of Romsey


It just so happened that the blade on the bandsaw cut a 3mm kerf. There was a lot of trial and error went on before I found the right combination of kerf with and veneer thickness.
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Re: Segmented bowl

Postby 9fingers » 29 May 2017, 08:11

Thanks Andy. There must be one hell of a set on those blade teeth.
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Re: Segmented bowl

Postby Andyp » 29 May 2017, 08:33

I'll check my measurements later Bob. Perhaps the the fact that I was forcing the blade in a rather tight curve and an effect on the kerf.
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Re: Segmented bowl

Postby Andyp » 29 May 2017, 10:09

9fingers wrote:Thanks Andy. There must be one hell of a set on those blade teeth.
Bob


You are right Bob :oops:

The veneer thickness is actually 1.5mm. Why I thought t was 3mm I do not know. I've checked the Crispins paperwork too as well as measured and I've corrected the original post.

Veneer thickness
Image

A bit difficult to measure the set on the blade so I did my best to measure the kerf
Image

That's 1/16th of an inch or 1.5875mm

I'll treat myself to a some metric dial calipers one day.
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Re: Segmented bowl

Postby 9fingers » 29 May 2017, 10:45

Ah! That's more better!
Thanks
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