Pianotech

Hi all,

I'm getting my regulation parameters set for my Knabe rebuild. While I had to raise the let-off button fairly high on the bottom test notes of the piano, there was sufficient room to get my target let-off. However, I'm running into an issue at the top where there is no more room to move the let-off button any higher, and I've not quite met my target let-off. Any suggestions would be appreciated. Please see photo.

 Thank you!

Hi all,

I'm getting my regulation parameters set for my Knabe rebuild. While I had to raise the let-off button fairly high on the bottom test notes of the piano, there was sufficient room to get my target let-off. However, I'm running into an issue at the top where there is no more room to move the let-off button any higher, and I've not quite met my target let-off. Any suggestions would be appreciated. Please see photo.

 Thank you!

Yes, already checked these…

Hi all,

I'm getting my regulation parameters set for my Knabe rebuild. While I had to raise the let-off button fairly high on the bottom test notes of the piano, there was sufficient room to get my target let-off. However, I'm running into an issue at the top where there is no more room to move the let-off button any higher, and I've not quite met my target let-off. Any suggestions would be appreciated. Please see photo.

 Thank you!

Yes, already checked these…

Hi all,

I'm getting my regulation parameters set for my Knabe rebuild. While I had to raise the let-off button fairly high on the bottom test notes of the piano, there was sufficient room to get my target let-off. However, I'm running into an issue at the top where there is no more room to move the let-off button any higher, and I've not quite met my target let-off. Any suggestions would be appreciated. Please see photo.

 Thank you!

Hi all,

I'm getting my regulation parameters set for my Knabe rebuild. While I had to raise the let-off button fairly high on the bottom test notes of the piano, there was sufficient room to get my target let-off. However, I'm running into an issue at the top where there is no more room to move the let-off button any higher, and I've not quite met my target let-off. Any suggestions would be appreciated. Please see photo.

 Thank you!

If these are two part jacks make sure that the jack arms are not coming loose.

There might be something else wrong in the train of the parts.

In the end you could bend up the brackets for the let-off button rail, but first find the real problem.

Hi all,

I'm getting my regulation parameters set for my Knabe rebuild. While I had to raise the let-off button fairly high on the bottom test notes of the piano, there was sufficient room to get my target let-off. However, I'm running into an issue at the top where there is no more room to move the let-off button any higher, and I've not quite met my target let-off. Any suggestions would be appreciated. Please see photo.

 Thank you!

Hi all,

I'm getting my regulation parameters set for my Knabe rebuild. While I had to raise the let-off button fairly high on the bottom test notes of the piano, there was sufficient room to get my target let-off. However, I'm running into an issue at the top where there is no more room to move the let-off button any higher, and I've not quite met my target let-off. Any suggestions would be appreciated. Please see photo.

 Thank you!

I would measure the height of the center pin to the key bed and measure the string height, to compare the bore distance on the hammers.  The string height should equal the sum of hammer flange pin and the bore distance.  You have new shanks, and if any of the dimensions have changed, knuckles, flanges, etc., that will also affect regulation.  Anything that has changed, including the wippen felt, knuckle size, etc., will affect things.  You probably don't have the original parts, or I would suggest reinstalling a few to see what might have changed.

Hi all,

I'm getting my regulation parameters set for my Knabe rebuild. While I had to raise the let-off button fairly high on the bottom test notes of the piano, there was sufficient room to get my target let-off. However, I'm running into an issue at the top where there is no more room to move the let-off button any higher, and I've not quite met my target let-off. Any suggestions would be appreciated. Please see photo.

 Thank you!

I would pull a string along the hammer rail and see if the brackets are all the same. Expanding action brackets causes hammers to block. 

My thought is when you change the back rail cloth to thicker, it adds to the scrubbing motion. It would have an exaggerated effect in the treble where the keys are shorter. My experience has been that you need to keep the back rail cloth as close to original as you can imagine it.

I would measure the height of the center pin to the key bed and measure the string height, to compare the bore distance on the hammers.  The string height should equal the sum of hammer flange pin and the bore distance.  You have new shanks, and if any of the dimensions have changed, knuckles, flanges, etc., that will also affect regulation.  Anything that has changed, including the wippen felt, knuckle size, etc., will affect things.  You probably don't have the original parts, or I would suggest reinstalling a few to see what might have changed.

Hi all,

I'm getting my regulation parameters set for my Knabe rebuild. While I had to raise the let-off button fairly high on the bottom test notes of the piano, there was sufficient room to get my target let-off. However, I'm running into an issue at the top where there is no more room to move the let-off button any higher, and I've not quite met my target let-off. Any suggestions would be appreciated. Please see photo.

 Thank you!

I would pull a string along the hammer rail and see if the brackets are all the same. Expanding action brackets causes hammers to block. 

My thought is when you change the back rail cloth to thicker, it adds to the scrubbing motion. It would have an exaggerated effect in the treble where the keys are shorter. My experience has been that you need to keep the back rail cloth as close to original as you can imagine it.

I would measure the height of the center pin to the key bed and measure the string height, to compare the bore distance on the hammers.  The string height should equal the sum of hammer flange pin and the bore distance.  You have new shanks, and if any of the dimensions have changed, knuckles, flanges, etc., that will also affect regulation.  Anything that has changed, including the wippen felt, knuckle size, etc., will affect things.  You probably don't have the original parts, or I would suggest reinstalling a few to see what might have changed.

Hi all,

I'm getting my regulation parameters set for my Knabe rebuild. While I had to raise the let-off button fairly high on the bottom test notes of the piano, there was sufficient room to get my target let-off. However, I'm running into an issue at the top where there is no more room to move the let-off button any higher, and I've not quite met my target let-off. Any suggestions would be appreciated. Please see photo.

 Thank you!

Hi all,

I'm getting my regulation parameters set for my Knabe rebuild. While I had to raise the let-off button fairly high on the bottom test notes of the piano, there was sufficient room to get my target let-off. However, I'm running into an issue at the top where there is no more room to move the let-off button any higher, and I've not quite met my target let-off. Any suggestions would be appreciated. Please see photo.

 Thank you!

Tim, 

The letoff rail may have moved or the related parts might have been altered to accommodate an error.

It may be as simple as sliding it in/out or pulling it off to get the forks in a bit further; they may be threaded. 

Also, check the usual suspects such as keyframe bedding, action bracket fitment (this can show up as 

center pin height. Make sure that the action rail has not moved. See what the spread is on the good notes

and also if it matches on problem notes. And as Blaine said, check the jack toes. 

------------------------------
Dave Conte, RPT

Piano Technician in Residence
The University of Tennessee
College of Music
Knoxville TN
(817) 307-5656
Owner: Rocky Top Piano

Original Message:
Sent: 08-02-2023 21:04
From: Tim Foster
Subject: Let-off adjustments

Hi all,

I'm getting my regulation parameters set for my Knabe rebuild. While I had to raise the let-off button fairly high on the bottom test notes of the piano, there was sufficient room to get my target let-off. However, I'm running into an issue at the top where there is no more room to move the let-off button any higher, and I've not quite met my target let-off. Any suggestions would be appreciated. Please see photo.

 Thank you!

------------------------------
Tim Foster RPT
New Oxford PA
(470) 231-6074
------------------------------

It may be an illusion of the photo, but it looks like the distance from the action rail to the top of the let off rail changes from left to right.

Are those composite flanges?

------------------------------
Steven Rosenthal RPT
Honolulu HI
(808) 521-7129

Original Message:
Sent: 08-03-2023 11:19
From: Dave Conte
Subject: Let-off adjustments

Tim, 

The letoff rail may have moved or the related parts might have been altered to accommodate an error.

It may be as simple as sliding it in/out or pulling it off to get the forks in a bit further; they may be threaded. 

Also, check the usual suspects such as keyframe bedding, action bracket fitment (this can show up as 

center pin height. Make sure that the action rail has not moved. See what the spread is on the good notes

and also if it matches on problem notes. And as Blaine said, check the jack toes. 

------------------------------
Dave Conte, RPT

Piano Technician in Residence
The University of Tennessee
College of Music
Knoxville TN
(817) 307-5656
Owner: Rocky Top Piano

Original Message:
Sent: 08-02-2023 21:04
From: Tim Foster
Subject: Let-off adjustments

Hi all,

I'm getting my regulation parameters set for my Knabe rebuild. While I had to raise the let-off button fairly high on the bottom test notes of the piano, there was sufficient room to get my target let-off. However, I'm running into an issue at the top where there is no more room to move the let-off button any higher, and I've not quite met my target let-off. Any suggestions would be appreciated. Please see photo.

 Thank you!

------------------------------
Tim Foster RPT
New Oxford PA
(470) 231-6074
------------------------------

I think it's an illusion. Yes, WNG shanks, knuckles, flanges.

It may be an illusion of the photo, but it looks like the distance from the action rail to the top of the let off rail changes from left to right.

Are those composite flanges?

------------------------------
Steven Rosenthal RPT
Honolulu HI
(808) 521-7129

Original Message:
Sent: 08-03-2023 11:19
From: Dave Conte
Subject: Let-off adjustments

Tim, 

The letoff rail may have moved or the related parts might have been altered to accommodate an error.

It may be as simple as sliding it in/out or pulling it off to get the forks in a bit further; they may be threaded. 

Also, check the usual suspects such as keyframe bedding, action bracket fitment (this can show up as 

center pin height. Make sure that the action rail has not moved. See what the spread is on the good notes

and also if it matches on problem notes. And as Blaine said, check the jack toes. 

------------------------------
Dave Conte, RPT

Piano Technician in Residence
The University of Tennessee
College of Music
Knoxville TN
(817) 307-5656
Owner: Rocky Top Piano

Original Message:
Sent: 08-02-2023 21:04
From: Tim Foster
Subject: Let-off adjustments

Hi all,

I'm getting my regulation parameters set for my Knabe rebuild. While I had to raise the let-off button fairly high on the bottom test notes of the piano, there was sufficient room to get my target let-off. However, I'm running into an issue at the top where there is no more room to move the let-off button any higher, and I've not quite met my target let-off. Any suggestions would be appreciated. Please see photo.

 Thank you!

------------------------------
Tim Foster RPT
New Oxford PA
(470) 231-6074
------------------------------

you need to get the shanks off the rebound rail felt lower the rail a bit and see what effect it has. Second- check the action spread and the let-off rail position over the jacks. Third- make sure cheek blocks are on and tightened Fourth- set let-off in the piano you should get a slight hammer to string contact sound when pressing the key slowly. The jack needs space in the rep window- you also need to have aftertouch, good rep string strength . Forget any specific parameter although 1/8 is commonly used. The new WN&G hammers/shanks/flanges may be having an effect. also check the jack to knuckle alignment and the two piece glue joint on the jacks as suggested. i have seen that type of jack on knabes and steinways  t

I think it's an illusion. Yes, WNG shanks, knuckles, flanges.

It may be an illusion of the photo, but it looks like the distance from the action rail to the top of the let off rail changes from left to right.

Are those composite flanges?

------------------------------
Steven Rosenthal RPT
Honolulu HI
(808) 521-7129

Original Message:
Sent: 08-03-2023 11:19
From: Dave Conte
Subject: Let-off adjustments

Tim, 

The letoff rail may have moved or the related parts might have been altered to accommodate an error.

It may be as simple as sliding it in/out or pulling it off to get the forks in a bit further; they may be threaded. 

Also, check the usual suspects such as keyframe bedding, action bracket fitment (this can show up as 

center pin height. Make sure that the action rail has not moved. See what the spread is on the good notes

and also if it matches on problem notes. And as Blaine said, check the jack toes. 

------------------------------
Dave Conte, RPT

Piano Technician in Residence
The University of Tennessee
College of Music
Knoxville TN
(817) 307-5656
Owner: Rocky Top Piano

Original Message:
Sent: 08-02-2023 21:04
From: Tim Foster
Subject: Let-off adjustments

Hi all,

I'm getting my regulation parameters set for my Knabe rebuild. While I had to raise the let-off button fairly high on the bottom test notes of the piano, there was sufficient room to get my target let-off. However, I'm running into an issue at the top where there is no more room to move the let-off button any higher, and I've not quite met my target let-off. Any suggestions would be appreciated. Please see photo.

 Thank you!

------------------------------
Tim Foster RPT
New Oxford PA
(470) 231-6074
------------------------------

Hi all,

I'm getting my regulation parameters set for my Knabe rebuild. While I had to raise the let-off button fairly high on the bottom test notes of the piano, there was sufficient room to get my target let-off. However, I'm running into an issue at the top where there is no more room to move the let-off button any higher, and I've not quite met my target let-off. Any suggestions would be appreciated. Please see photo.

 Thank you!

I would first check if there are some geometry issues, but you can carefully whittle a deeper place in the wooden letoff rail for the bracket legs to fit. Then make sure that all the let off buttons are as far on the letoff screw as they can be, so you don't run out of head room for the eyelet.

Hi all,

I'm getting my regulation parameters set for my Knabe rebuild. While I had to raise the let-off button fairly high on the bottom test notes of the piano, there was sufficient room to get my target let-off. However, I'm running into an issue at the top where there is no more room to move the let-off button any higher, and I've not quite met my target let-off. Any suggestions would be appreciated. Please see photo.

 Thank you!