Cutting fret slots failed. And now?

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Cutting fret slots failed. And now?

Postby Beate Ritzert » Thu Dec 06, 2018 8:24 pm

A while ago an attempt to cut fret slots failed miserably. The upper half is completely off and in the lower half a few slots turned out too wide. I was using my tiny Kataba saw because i did not find my fret saw.

The fingerboard - indian rosewood - has already been glued on the neck by the manufacturer (Framus, unfinished neck from the end of their production in the mid 70s).

And now?

If possible i would like to save the wood and try a repair - i know, uneconomic, but in any case a good exercise. And i could still make a new fingerboard if that repair failed

I own a piece of indian rosewood in similar color and with similar texture, but narrower than the fingerboard, and i am not sure wether and how i should cut such narrow slices of wood. Or should i widen up the slots a bit?

Thanks for any tips.

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Beate Ritzert
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Re: Cutting fret slots failed. And now?

Postby Keith Howell » Fri Dec 07, 2018 4:03 am

What I have done when inadvertently cut a slot in the wrong place is filled it with veneer of the same species and as close a colour as you can find cut of the end grain of a strip.

Gluing the veneer in with cyano and making sure it is proud of the fretboard face then sanding it down level and pushing the sanding dust into the slot while the glue is still wet.

In Indian rosewood I have found it makes for a close to invisible repair
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Re: Cutting fret slots failed. And now?

Postby Bill Raymond » Fri Dec 07, 2018 12:32 pm

I've cut thin strips from the end of a scrap piece of fretboard using a miter box to fill in an occasional misplaced fret in an ebony fretboard. Veneer should also work, but I wanted the grain orientation to be consistent with the fretboard--though I doubt that it really mattered.
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Re: Cutting fret slots failed. And now?

Postby Clay Schaeffer » Sat Dec 08, 2018 11:41 pm

Hi Beate,
How far off are the fret slots? If they are not too far off sometimes the fret will cover the mistake after filling and recutting the slot. Another possibility might be to veneer over the fret board and recut the slots.
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Re: Cutting fret slots failed. And now?

Postby Beate Ritzert » Sun Dec 09, 2018 9:01 am

Some, but not all slots will be visible after closing and re-cutting.
I wonder how i actually managed to cut that far off... (well, two o'clock in the night, and the upper part of the neck is more difficult to clamp...)

In order to hide the error the easiest would be to use the identical spare neck i have...
But anyway, i would just like to repair my mistake.

Is there any precaution i should take when i try to cut slices 0.5 mm thin from a piece of rosewood? That thickness is identical to the thickness of the cut of my saw. Is it better to use a Kataba or a fine saw with a stiff back?
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Beate Ritzert
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Re: Cutting fret slots failed. And now?

Postby Brian Evans » Sun Dec 09, 2018 10:13 am

I use plane shavings to fill in fret slots (yep, I admit it). I plane along the grain so the grain is strong in the direction of the slot, the shaving is tapered, I trim off the bottom thin part so it fits tightly into the slot, then a little more, and I press the shaving in with glue so that it is a quite tight fit. Dry appropriately for glue (I often use CA for this, so 10 minutes), scrape or chisel excess, sand, and recut slot. I have quite successfully moved a slot .010" (half a slot width) using this technique. If I bail out of cutting the slot before it's full depth, then I use sanding dust and CA glue to fill in.
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Re: Cutting fret slots failed. And now?

Postby David King » Sun Dec 09, 2018 3:51 pm

I think I would try mixing a small amout of epoxy with some fine wood dust that's a bit lighter than the rosewood, perhaps walnut if you have some. The dust will look a lot darker once saturated with the epoxy so you need to start lighter to get close to a match. Otherwise cutting a narrow wedge shaped strip off the end of your scrap piece and jamming it into the offending slot filled with hide glue may be possible if you can saw that accurately without turning the sliver to dust in the process. I don't think I'd have the patience for that. In my shp I'd probably plane off the top of the fingerbard to the bottoms of the slots and glue on a 3mm veneer over the whole thing but that would require a lot of time without the machines I have to play with.
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