188cm dia timber ring.

[artful bodger]

Just for interests sake general perusal.
Got this unusual job out of the blue last week.
Client needed an timber ring to house an electronic musical instrument that responds to changing weather conditions to make it's music.
Outside diameter had to be 1880mm, inside dia 1720mm and the thickness had to be at least 100mm.
As I have made a few round windows before using segmented construction, figured that I may as well do the same here.
First step is to make a template for the segments. It must me made as accurately as possible......
DSCF4981.jpg This segment template is for 8 segments per row and the finished item will have 3 rows. So that's 24 segments at 34mm thick. Timber store in town had Tas oak dressed framing 165x35mm so just had to thickness a mm of it.
Bought 2 thin sheets of craftwood and fixed them together on the floor (as I dont have a workbench wide enough) and marked out the inside and outside diameters with a set of trammels. Then started the building up....
DSCF4956.jpgSkew nailed the first segment to the craft wood and then used pinch dogs to clamp the segments end to end and continued skew nailing as I went.
DSCF4957.jpgPut strips of newspaper under the joins to stop the ring sticking to the craftwood. Once the first layer is done it's time to biuld up the second one.
DSCF4958.jpgEach segment on the second row is glued and screwed to the first row with the joints overlapping (a bit like round brick work). Then the 3rd row...
DSCF4960.jpg Once the 3rd row is done it's all over, job done.
DSCF4979.jpg The guys who made the electronic musical instrument that goes in the ring made it in London and dropped in today to make sure everything would fit together (thankfully all was good). The whole assembly is going into the wilderness somewhere for a short time to make it's music for a beer commercial of all things. Then it's off to the Melbourne cup to be in the corporate area of the beer company.

[Evanism]

I like those draw-nail-hammer-inners you use. What are they called?

[Rod Gilbert]

Great work would you be a patten maker by any chance.
They are pinch dogs and work a treat for pulling joints together when the hole they leave is covered or not of consequence. They give plenty of pressure to hold a glue joint.
Regards Rod.

[Gestalt]

I like those draw-nail-hammer-inners you use. What are they called?

Nice work artful bodger, I've never come across those pinch dogs before either. Here's a good video on them for anyone interested.
https://www.youtube.com/watch?v=L0WIWIdY6CQ

[artful bodger]

Yes I am a patternmaker. Though rarely do patterns these days.
Glad I still have the pinch dogs, they are ideal for this type of work.

[Rod Gilbert]

Hi artful bodger,
I just figured that there was a good chance you were as the only people who I have seen with pinch dogs seems to be pattern makers. I to am glad to still have mine in various sizes they come in handy at times especially in work like this as there isn't much else that will easily do the job.
Regards Rod.

[DSEL74]

Pinch Dogs eh? Theres another project to make at the forge!

How did you accurately form each of the segments?

[Gestalt]

Pinch Dogs eh? Theres another project to make at the forge!

How did you accurately form each of the segments?

Here's a listing for 27 various sizes up for grabs.
http://www.ebay.com.au/itm/Lot-x27-V...item419d170a7a
Seems pretty cheap really. I was tempted, but wouldn't have the use.

[artful bodger]

How did you accurately form each of the segments?

The template that is shown in the first picture is just 3mm craftwood/mdf. You use that to mark out the 24 required segments by placing it on the timber and marking around it with a fine pencil. Then you cut each segment with a bandsaw.

[DaveTTC]

Following this one

Dave TTC
Turning Wood Into Art

[artful bodger]

^^^Thanks for the interest Dave^^^
Afraid this one is just about over, however knowing you are a turner there is a tread I posted some time ago that goes further into the details of the above job and then the whole lot is turned on a lathe to make a round window. Here is the link in case you missed it...........
https://www.woodworkforums.com/showth...12#post1767912

[DaveTTC]

Yes saw that. Rather enjoyed it.

Dave TTC
Turning Wood Into Art

[clear out]

I have a set or two of dogs that need to go.
Will probably take them to a TTTG sale in Sydney.
H.

[artful bodger]

Well got a bit of feedback on this job today which is nice. Here is a short 8 second video of it with the electronic musical instrument set up in it and working (I think). Maybe just tuning the thing in I'm thinking.
Don't blink, or you will miss it.
https://drive.google.com/file/d/0B_9...?usp=drive_web

[Lappa]

Great looking ring - shame about the music?