Thanks - it all helps - no rush.Michael.N. wrote: ↑Thu Nov 23, 2017 8:43 amI think I can answer most of your questions but not at the moment - workshop is going through a major revamp, so all the relevant info isn't immediately to hand.
As for the half circle. You can build to a half circle but I don't think any historical lutes were done that way. Most were a flattened half circle. I think either the Heiber or the Venere comes closest - around 5% flatter than a true half circle.
I think your string spacing at the nut seems to be correct or at least very close. I seem to recall making my vihuela's around 50 - 52 mm nut width so your 65 mm figure will be close too. Don't forget these numbers will vary on historical instruments so there's no one definitive answer, just a range.
I should have the information in under a week.
That is what I have always heard. I have only done one lute. A 10 course renaissance type about 30 years ago. Flat fretboard. I considered a Baroque lute with a curved fretboard as being way too advanced for my (lack of ) skill. Various music instrument museums have/had plans available for historical instruments if I recall correctly. And there are some online catalogues with the basic dimensions. I think a few of the UK lute makers might also have some details on line too but I don't have any links bookmarked.
Mine was actually very soft. Poplar. But it is veneered with Anegre which is quite resistant and of course an ebony fretboard. I was told at the time that poplar was a common wood for this purpose historically at least in the German speaking world. It also has a nice big 6" nail in the neck to body joint. Apparently the reason is to prevent the neck destroying the top in the even that the neck joint breaks under string pressure. Apparently also done in things like cello or so I heard.
I have made the mould - and have lined it out to 13 ribs spacings and they seem to align ok. I'll now dress the segments flat.Michael.N. wrote: ↑Sat Nov 25, 2017 3:11 pmIt's not so much the number of ribs but the angle of the rib joints. That will change from rib to rib, which it does on rather flattened lute bowls. Lute bowls based on a semi circle don't vary or vary much less from rib to rib, at least that is the theory. In practice you will almost certainly have to continually adjust to obtain good rib joints. It's one of those things that you have to do to get a feel for it.