Sorry, I should have taken more pictures. The front of the front rail is not bedded. When the keyframe is in the action cavity without the cheekblocks and the glide bolts are turned all the way up, there is a gap of about 1mm from the keybed to the front rail in the centre of the piano, and a 2-3mm gap at the extreme bass and treble ends. It does knock, and it does create a spongy feel. Pushing in newspaper or feeler stock to see whether it was consistently bedded further back along the front rail would have been a good idea, and I can try that out next time I see the piano (it is 1/2 hour out of town).
What I ended up doing was lowering the cheekblock screws until the front rail was equally raised from the bass to the treble and then doing a rough key leveling job. However, I would like to get to the bottom of this and do a proper repair eventually.
Jon, you mentioned that the "feet" might have been cut off in the keyframe. What exactly do you mean? I just took a look at the bottom of the keyframe of another Yamaha grand and I didn't see any feet.
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Peter Stevenson RPT
P.S. Piano Service
Prince George BC
250-562-5358
ps@pspianos.com------------------------------
Original Message:
Sent: 01-22-2019 14:06
From: David Skolnik
Subject: Entire front rail lifted in grand
Jon -
I'm starting to think you skip over my comments, but then, so do I. I think you might be misreading the photo the same way I (think I) was. You would be (and I would have been) right if the front 5 or 6 inches of the keybed are, in fact, in level with the back rail, i.e. theoretically parallel with the floor. However, if that section is actually tilted down from the level line, then that would explain the gap between key bed and front of key frame. If that is the case (for whatever reason), I'm guessing that adding material (to bed or frame) would be one approach. But, as I asked Peter, If the front rail is actually bedded, albeit further in from the front than standard, and there's no knock, would it work to leave it?
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David Skolnik [RPT]
Hastings-on-Hudson NY
914-231-7565
Original Message:
Sent: 01-22-2019 06:52
From: Jon Page
Subject: Entire front rail lifted in grand
The gap in that area is acceptable. The keyframe is to touch along the front rail, glides and rear edge of the back rail. The hollowed area back front the front rail insures that the keyframe behind the f/r doesn't touch/knock.
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Regards,
Jon Page
mailto:jonpage@pianocapecod.com
http://www.pianocapecod.com
Original Message:
Sent: 01-21-2019 23:10
From: David Skolnik
Subject: Entire front rail lifted in grand
Peter -
I see now where I was misinterpreting the original photo. So, are you saying that, with the full length straight edge, the keybed is level up until the front section, which is angled down? what is the angle? Is there any indication of trauma that would have displaced this part of the keybed? Is it consistent from one side to the other? Did you take newspaper or feeler stock to see if the front rail is contacting at the back edge of the front part, where the incline begins?
Another approach would be to speak with client to see what they might know, or with individual who did the QRS installation. Or you could also take good photos and excellent measurements and run it by Yamaha tech support, presuming, I suppose that this is not a grey market piano.
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David Skolnik [RPT]
Hastings-on-Hudson NY
914-231-7565
Original Message:
Sent: 01-21-2019 22:02
From: Peter Stevenson
Subject: Entire front rail lifted in grand
Hi David,
Yes, I was using a long straightedge, and I did use it against all of those axes on the keybed and keyframe. I only got out the 6" ruler because it made it easier to see the gap in the photo.
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Peter Stevenson RPT
P.S. Piano Service
Prince George BC
250-562-5358
ps@pspianos.com
Original Message:
Sent: 01-21-2019 20:26
From: David Skolnik
Subject: Entire front rail lifted in grand
Actually Peter, the photo you provided doesn't really support your narrative. To begin, you would want to examine keybed (and frame) with straight edges that were long enough to span the entire confection. In the case of the keybed, from back rail to front and from bass end to treble. For the key frame it's mostly a matter of front rail to back. If you're photo had placed a straight edge from back to front, and a high spot had been evident back from the front edge, leaving a visible gap, then that would have been consistent. Then you would have had the option of either planing the front rail of the keybed or shimming the underside of the keyframe front rail. Maybe you could take a few more photos?
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David Skolnik [RPT]
Hastings-on-Hudson NY
914-231-7565
Original Message:
Sent: 01-21-2019 20:13
From: Jim Ialeggio
Subject: Entire front rail lifted in grand
Keybed warped?
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Jim Ialeggio
grandpianosolutions.com
Shirley, MA
978 425-9026
Original Message:
Sent: 01-21-2019 20:06
From: Margaret Jusiel
Subject: Entire front rail lifted in grand
I have a similar problem with a Yamaha baby grand (can't remember model) except it doesn't have a QRS system installed. I'm referring it to a more experienced technician. In the meantime, I'm going to follow this thread in case it puts a lightbulb over my head. Thanks.
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Maggie Jusiel
Athens, WV
(304)952-8615
mags@timandmaggie.net
Original Message:
Sent: 01-21-2019 16:19
From: Peter Stevenson
Subject: Entire front rail lifted in grand
Hello all,
I am servicing a Yamaha G5 with a QRS system installed (not by me) and I was going to do a thorough keyframe bedding and key levelling job. However, even after I lift up all of the bedding screws, the front rail is lifted up off of the keybed, preventing me from bedding the balance tail. I haven't encountered this before. Any ideas as to what is going on or how to fix it?
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Peter Stevenson RPT
P.S. Piano Service
Prince George BC
250-562-5358
ps@pspianos.com
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