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Building Teardrop No. 2 #8: F-holes

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Blog entry by Dave Rutan posted 05-26-2020 12:08 PM 243 reads 0 times favorited 7 comments Add to Favorites Watch
« Part 7: Fitting and some gluing Part 8 of Building Teardrop No. 2 series Part 9: Bass bar »

The F-holes are located using measurements I have in a book. I traced the actual shape from a template I made from sheet aluminum (a lithographic printing plate)

First I drill out the round holes on either end using a 1/4 in. And 5/16 in. bit.

The pros use a fret saw to cut out the slots between the round holes. Either my fret saw is not deep enough, or I find it too fiddly to try and mount the thin blades sideways, but I found that using my scroll saw was a good option.

The slots are widened by carving with a knife, paying attention to the wood grain so that the top doesn’t split. I will need to widen mine. Last time I made them too narrow to insert the sound post.

-- Ni faru ion el ligno!



7 comments so far

View Dave Polaschek's profile

Dave Polaschek

5373 posts in 1352 days


#1 posted 05-26-2020 12:18 PM

Ok, that answers another question. Thanks again for walking us through the journey, Dave!

-- Dave - Santa Fe

View Oldtool's profile

Oldtool

2955 posts in 2961 days


#2 posted 05-26-2020 02:15 PM

Interesting, the F-holes are not symmetrical end to end, quarter inch and 5/16” drilling.

Is there a “standard” pattern to follow?, maybe a predetermined ratio of various aspects – such as the width at the widest part to where it narrows to almost nothing,

-- "I am a firm believer in the people. If given the truth, they can be depended upon to meet any national crisis. The point is to bring them the real facts." - Abraham Lincoln

View Dave Rutan's profile

Dave Rutan

1942 posts in 2959 days


#3 posted 05-26-2020 02:38 PM



Interesting, the F-holes are not symmetrical end to end, quarter inch and 5/16” drilling.

Is there a “standard” pattern to follow?, maybe a predetermined ratio of various aspects – such as the width at the widest part to where it narrows to almost nothing,

- Oldtool

There are several ‘standards to follow, depending on which Old Master you’re trying to duplicate.

There are all kinds of mathematical descriptions for every part of the violin. I’ll admit that I’m in no way competing with the old masters. In many cases a violin builder is trying to copy an old classic instrument. I’ll never be THAT good, nor do I want to.

I took my F-hole template from my one store bought violin, tracing the hole onto paper then onto the aluminum. I only use my books to help locate them. N.B. I’ve yet to get them exactly where I think they should be, but my first teardrop is still fun to play and sounds not bad.

-- Ni faru ion el ligno!

View Dave Rutan's profile

Dave Rutan

1942 posts in 2959 days


#4 posted 05-26-2020 02:40 PM



Ok, that answers another question. Thanks again for walking us through the journey, Dave!

- Dave Polaschek

Meanwhile I’ve taken my ‘luthier’ work bench back to work. I’ll be doing most of the rest of the work there as time allows.

-- Ni faru ion el ligno!

View Woodknack's profile

Woodknack

13383 posts in 3150 days


#5 posted 05-26-2020 04:56 PM

Cool work

-- Rick M, http://thewoodknack.blogspot.com/

View Sylvain's profile

Sylvain

1043 posts in 3270 days


#6 posted 05-30-2020 01:55 PM

“Last time I made them too narrow to insert the sound post.”
I was wandering:
Are the two notches, in each F holes, there to make the passage a little wider?

-- Sylvain, Brussels, Belgium, Europe - The more I learn, the more there is to learn

View Dave Rutan's profile

Dave Rutan

1942 posts in 2959 days


#7 posted 05-30-2020 05:59 PM



“Last time I made them too narrow to insert the sound post.”
I was wandering:
Are the two notches, in each F holes, there to make the passage a little wider?

- Sylvain

While the two notches do make a slightly wider area, their true function is A) decorative, and B) to mark where the bridge should be located (between the inward facing notches.) A doublebass maker in Connecticut only puts the inward facing notches in their instruments.

-- Ni faru ion el ligno!

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