Khalid Khalil - 4-18-2021 at 04:38 PM
can someone explain to me how can you build an oud with this shape? it is flat with a little bowl shape!
https://youtu.be/_8JtzDGzHzg
dusepo - 4-19-2021 at 12:43 AM
I have built instruments with this design of back. Here's a renaissance vihuela I built earlier this year for a customer in the USA:
The trick is to build a form first, the same as with a bowlback, but a different kind of form. Then use this form to know the correct side depth at
different points, and the arch of the back for bending.
You may also find it helpful to research the construction of the Mexican vihuela and the timple from the Canary Islands, which have a similar
construction, but with a 'hump' down the centre of the back.
Khalid Khalil - 4-19-2021 at 05:05 AM
thank you dusepo،
very helpful input.
dusepo - 4-19-2021 at 09:11 AM
Here's a half-form used by a timple luthier:
Mine are the same but with both sides. I had meant to take pictures for you in the workshop today but I forgot and have now finished work for the day.
Hopefully this picture shows the form enough to give an idea.
Khalid Khalil - 4-19-2021 at 12:48 PM
thank you 🙏
Khalid Khalil - 4-19-2021 at 02:01 PM
this is a similar shape without any curves in the sides !!
jdowning - 4-20-2021 at 05:03 PM
An example of a solid mold - in this case for a vaulted back renaissance guitar - is shown here among the images posted 8-21-2011.
http://www.mikeouds.com/messageboard/viewthread.php?tid=12229
jdowning - 4-21-2021 at 02:47 PM
I have found my original mold for the vaulted back guitar so attach some images of a temporary set up for information and clarification. The mold does
not need to be solid and full depth but is mounted on a spacer block to provide the required full depth of the guitar sides. This results in a
considerable saving in material and work.
The guitar is built up in the face down configuration on a flat board - together with the finished neck/pegbox assembly.
The oversized side blanks after heat bending and trial fitting to the mold are then carved down to fit the mold profile (and edge angle) at all points
- as mentioned earlier by Jo in this thread.
The shaped sides are then glued to the neck and end block and the ribs of the vaulted back bent, shaped, fitted and glued together in place. After
trimming the rib edges the completed body/neck assembly is then removed from the mold and internal reinforcing strips of paper or thin fabric are
glued over the rib joints - as is the case for an oud or lute bowl.
Another traditional European name for this type of vaulted back instrument is 'demi luth' ( i.e. half lute).
Khalid Khalil - 4-21-2021 at 03:06 PM
thank you jdowning ,
now it is very clear for me 