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New video showing my unique approach to adjusting let off.
Enjoy
-chris

Last edited by Chernobieff Piano; 10/19/21 11:36 PM.

Chernobieff Piano Restorations
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Good one, Chris.


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I like the spring loaded jig. Nice job!

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I use 6" of 3/32" wire to turn let-off buttons, with one end bent 45° about 3/8" in, so I can reverse it when I get into a corner. The spring loaded jig is good, but it might be better to pound the end that goes under the string wider. That looks like a good use for the wire I get from old political signs. I also use that wire for the end pins of upright pedal rods, when the plastic breaks in Asian pianos.


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Thank you Peter and William.

BDB, good suggestions thanks. The business end of the let off tool was flattened on an anvil. Hard to tell in the video though.

-chris


Chernobieff Piano Restorations
"Where Tone is Key"
Lenoir City, Tennessee U.S.A
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Is the flattened part about 1/16"? For me the tough part is seeing how the hammer is hitting the bottom of the letoff spacer. Is the hammer just barely touching it, or is it pushing pretty hard on it, such that if the spacer wasn't there, the hammer would go all the way to the string before letting off? That's why I use a light 1/16" diameter piece of wire that I swing back and forth under the string when the hammer is in its highest position. The amount of drag I feel on that wire gives me an idea of whether the hammer is just to the gap or moving too much into the gap.

Any suggestions on how better to gauge this?

Thanks for the videos, I plan to use them as a reference especially when doing my first soundboard and bridge work!


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Emery,
The let off spacer is .090 and the weight is .5 pounds. The use of the weight is to solve the problem of the drag you mentioned.

-chris


Chernobieff Piano Restorations
"Where Tone is Key"
Lenoir City, Tennessee U.S.A
www.chernobieffpiano.com
Youtube https://tinyurl.com/5aw83b73


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Originally Posted by BDB
I use 6" of 3/32" wire to turn let-off buttons, with one end bent 45° about 3/8" in, so I can reverse it when I get into a corner.
[snip]

BDB, for your let-off adjuster, do you use the wire plain, or have you crafted a wooden handle?

I ask because I also use a plain wire, but one mine, I've angled both ends:
- the one end like yours, at about45°, for working in corners
- the normal working end at about 5-10 degrees, (a) to gain access to the pilot hole over a wider range of angles, and (b) so that I don't have to hold the wire absolutely parallel to the keyboard, which is awkward when regulating compact upright actions.

I find that the slightly angled standard end gives me better access, but unfortunately it torques the wire, so after a while, my fingers grow tired of having to grip it tightly. This is exacerbated by the wire being on the thin side (probably only about 1/16"), and by my hands tending to sweat... So I'm considering to remake the tool using thicker wire and a thin wooden dowel as a handle. Any thoughts or comments on your experience welcome.


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I only use the wire, but a handle would be better. I have thought of sandwiching them between a couple of strips of wood, but I have not gotten around to it. Grooving small pieces of wood is not easy. I have thought of tubing, but it would be better if it were not round, so I could control the angled end.


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Before you adjust the letoff this way do you deliberately set the drop very low?

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Ambrozy,
Yes i lower the drop first.

BDB,
The width of the let off tool is so made as to go comfortably between the strings. I set it diagonally across the hammer.
-chris


Chernobieff Piano Restorations
"Where Tone is Key"
Lenoir City, Tennessee U.S.A
www.chernobieffpiano.com
Youtube https://tinyurl.com/5aw83b73


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It is correct to use a cylindrical shape tool to fit into the cylindrical bore of the jack escapement dowels.

That's why I made my universal grand let-off tool with one end for the standard eyelet let-off adjustment and one end with a cylindrical pin for the dowel let-off.
It's item # 3149 in the Schaff catalog captioned "Grand Let-off Regulator".


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