Any woodworkers ?

[Szaxe]

Hi, thanks everyone so far for your input ... though I should explain that I have probably seen all quadrant - semi-round - beading - molding - etc etc out there actually I have done this before with the same aluminium body as above, but for a smaller end instrument body. It worked using pine quadrants, but it was hard getting it done and the lack of precision spoiled the result.



If you note, 4 quadrants ( no. 2), make the correct round body (no. 1), however its solid ... I need no 4, which is no. 2 with the bottom part of no. 3 planed down to the line.

There are beadings that look similar to no. 4 offered, but the dimensions never indicate the diameter of the circle they were taken from http://www.ebay.co.uk/itm/SOLID-OAK...89747?pt=UK_Flooring&var=&hash=item43ae0ce613

Like the above example it shares the same name "half round" when it clearly isn't. This is the same all over the internet.

I am sure what I want can be bought of the shelf and someone with knowledge could point me to it .... Failing that hopefully someone has the tools to do a pro job at planing quadrants, which although costlier will do the same job ...

 

[Szaxe]

Wow, here we go. Gonna have a try and PLEASE correct me if my maths is (are) wrong, it's been a while. Ok, you want a circle of diameter 40 mm? Giving it a radius of 20mm, meaning that each edge of your quadrant adjacent to the right angle will also be 20mm. Using Pythagoras theorem (a2+b2=c2) means that the straight edge of fig.3 must be 28.28 mm long.

Now for the circumference: C=2pi r =2x3.1415927x20 = 125.66mm, you want quadrant so divide by 4 = 31.41mm.

So find a bit of your chosen wood with a straight edge measuring 28mm and a curved edge measuring 31mm, glue 4 of them together and you should end up with something pretty damn close to a circle. Hope this helps and that I haven't completely misunderstood the question and made a monkey of myself

P.S. You might need some very small pieces of wood in each internal corner for the glue to adhere to

Thanks mate, you may be giving me the right answer, but I don't know how to translate that with the dimensions given by traders see here http://www.ebay.co.uk/itm/SOLID-OAK...arpentry_Woodwork_ET&var=&hash=item43ae34b4a0 and in my other post above...