5/05/2012

Workshop: Interiors


I've been cleaning up the workshop all day long so I haven't got much repairwork done -- so -- how about some working photos from the last couple days?

Above is the rear of the recently completed Camp Uke. Here you can see the resonator coming off and that multi-ply maple with monkeypod-shell rim made like a thin banjo rim. Very sturdy!


Here's the inside. Single brace on a thin top. Since these photos I've also cleated up a number of hairlines that were starting to go through.


And here's our next victim...! This is the rim of a French-style banjo mandolin which has a big "top tension" zither-style head-tightening design. In this case the rim also serves as the resonator back. One annoying bit about this design is the tendency to NOT have a dowel that goes through the body which means that the instrument isn't as stable as an American-style banjo design. Note the two big screws that hold the neck to the pot.


There they are. The inside of this resonator was filthy before I cleaned it up. Also note the sort of sloppy interior work -- not sanded off and it's left rough. Not really an issue since no one will see this save us repairfolk, but still...!


Here are the frets on said banjo-mando all dressed up.


And here's the head-tension assembly after some cleaning.


If you can see this -- basically what goes on here is that when one tightens the screws it pulls the lower ring up towards the top of the instrument and because the ring has a raised lip (it's in essence the rim/tonering combined) it tightens the head against it. This means that when the head tightens the actual head slightly raises itself "up." Fortunately, the changes are so minute that this doesn't really effectively change the setup appreciably.

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